GeoSci.xyz GWB Lectures, 4 Feb 2020

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From YouTube: 2020 02 04 Day2 Part3 IRISinstrument

Description

In this video, we discuss the basic operation of the Syscal IRIS instrument.

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The net plug like that then.

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With their clamp on it me.

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Wear these on the Lamia, so that just gets on the.

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When we're doing the multi electrode one, so this this system can do 72 electrodes, you can tell unless.

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That net forgot, where we are.

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And it does that through a multi wire, cable, there's 36 conductors in here.

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This weighs about.

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These yellow are these are the take outs that this gets clamped look. This gets clamped those and take them to there any wild, cheetah, hi, hello can't believe in the Apple announced and there's 18 on each of these cables. 18 of these take hose ain't.

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Cause the ship rubato they take all that money and then.

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Connects through this box and then take name to the next table, so there's.

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36, let's put it in join the Allies, so there's 36.

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Electrodes on each side of this box, those.

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That's helpful yeah, oh yeah, divine device and.

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These take heads are 10 meters, apart on the cable, cable.

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Knit a semi doc watch spotting, yeah and so.

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It was spread in a total of seven hundred and ten meters.

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The mall I mean.

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The conductor's will stretch him several times and, as they teach I see him shining out, 72.

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B

And, let's see so typically with that multi-channel system, multi electrode system, you can see one six to one seventh of the whole length. One.

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Know so you can see 100.

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Meters of my divine 100.

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Meters in resistive conditions, as you saw in the work that that was doing it, will see deeper. So it.

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B

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Conductive conditions, it may only see semi conductor in low resistivity.

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Say a 100 ohm meter upper layer all.

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My oh me down all the current.

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C

Say that focus hunter, don't either.

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This is to conductive 100 old meters that it may not see is deep. So if that was 100.

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B

So here the system you can look, oh I was okay.

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Listen I have to do that for this room.

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So for tomorrow, I'm going to show you how we'll use this system for just doing one D, and that is the for electrode survey.

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So one team looked at about sign language for them.

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You can see you on here current C, a B which we've been working with all along and.

A

As he gave me do, Batman there's.

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Where the potential voltage is measured and put.

A

That shows get that Emma and the j-man. So.

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These banana plugs will go into a V for the current electrode and and for the potential holes and electrons try.

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And let the guy in a PM n, gamma.

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Some of the other features, so this is the one who will bring it up. On/Off switch light.

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Mint lemon clip I.

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It can use an internal battery to transmit, so TX is transmitter, tanks got transmit data about it, Rx is receivers receive on it, and so you can put a 12 volt battery a car battery to make bigger occurrence got Patrick.

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Nathan join me thumbnail or.

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At the last a long time.

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Take it down oh yeah,.

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Let's just turn it on and go.

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That's the menu window that comes up when you start and.

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Has those brackets around it is what the keystroke will will work with.

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Yeah, the keys here.

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So I just cursor it across here across and now it's on setup.

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Then there's memory and sequence, whatever the sequences so I'm just going to show you what we'll do tomorrow, because we have so many people. It will be easier for you see it here today and then you'll know what we're doing tomorrow.

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The enter button right there and she may, and so you can set it into different modes mohkum. You know the standard mode is for just doing single measurements at a time.

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I can arrow through.

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I should be able to go here. Oh okay, even I get confused. I can't see where it is right now.

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C

Oh, it's still ongoing. Okay, yep.

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So I'm erroring over to change, change.

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So these are the other moments we're doing our to be survey will have it on automatic.

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Seafood is not venomous a non genetic sex with us sequence, the bottleneck and.

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Will probably never use those two I think about it's.

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Needed for the work that we're doing one D into D, one.

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Thing about my pad love, magnet, I, didn't drop out so.

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We'll stick with a standard mode right now,.

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Options, this is the options menu.

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Option menu map so for.

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Standard for our standard mode of collecting for our vertical electrical sounding about.

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To cut down like that, it's not mean look, they pass out. You.

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Can't see, but there's a cross in here, so it's going to average a set of readings over approximately two or three seconds.

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Going to average a so this unit will collect, is doing continuous monitoring of the voltage at.

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The corral on top and.

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It a ver ajiz those values over a period of time now.

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Average, by the take one with you have a method. This is instantaneous.

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Yeah instigated, what's that, what's the.

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It's the instant and then alumni, so that's a different setting. It just takes the last four measurements. Let.

A

That up thank not Cindy April's over that man. Yeah.

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So, whereas the average one that we have is set before it takes it over the four seconds and it's probably measuring 200.

A

Same day, mom, even a clinical thing now I think we additive all together and.

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Then you have a choice of Cheney for unsigned, so this is absolute value. The.

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Sign, that's actually met it.

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Do you know mathematically what the absolute values there's no minus or plus so.

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I'm trying to Dale last image.

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It doesn't matter which direction the voltage is in it's just a single positive gonna, most.

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Difficult but I have a pendant so.

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Yeah, you would just set these two before you ran the survey.

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B

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To say, I know what you have on man, which is average yep.

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Average and an unsigned.

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See is it working at 23 there, yet, okay, so just started a survey. We've got that all set up, we're just going to hit start.

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We've still got one more, the units are in meters.

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You need a Madonna element, not feet. Big lazy body.

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You see what setup.

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C

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Just a second, where was array he's here a on there.

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These keys are difficult to push you sort of have to roll your finger on it.

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A

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Ate come on, I forgot to set the the array type, so Doug was showing you a winter array or a Schlumberger array up.

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So that was the slumbering array there, where you leave these at the same spot, you leave the potential voltage electrodes at the same location and then lose the current electrode zone.

A

Jeremiah I'm gonna shoot me Tommy. You know in that big whoosh, big round head or.

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The winner array, where everything is the same distance apart and you move them together when you're doing your version.

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Why not reach out yeah and.

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It's set for celebrity right now, if I remember correctly,.

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C

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Right down there, let's do a winner first, because that's easier to understand, though so I don't know. If you saw I selected winner array, there.

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And then I go to start, hopefully.

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Now it's looking for some information from you as to what your measures measurement is going to be. So when we do a wonder array, we usually do it around the zero point. So here is zero right here, mn or a certain distance apart and then a 2m is the same distance and to be is the same distance when.

A

I raced I, don't miss an acetal they much how about it? How about mom yeah? Well, we had to do get tiring, so we've set the midpoint to be zero, as I lay number one at zero time. I mean the.

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Same as you were doing with the notebook there.

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And there's a y-value, but the y is always zero, because we're just working in one dimension: 1.

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0 0 1 G better than example,.

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So it didn't roll there.

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And now here's the number that you have to put in be saying what you're going to do so before you go and do a vertical electro set electrical sounding. You have to decide what separations you want to do and it's usually done in a logarithmic scale. So.

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That might sound a little mess and while we do that math no, we don't answer that.

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So, typically, that everybody is familiar with a log scale, typically what we always kill logarithmic scale. So we.

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We typically, if we're doing a lot of a logarithmic scale, and we had quite a fit bit of data to collect. We go like distances x, equals one two, four, seven and twenty already.

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Great, that's how that would sample the data set fairly well, rather than doing it every like one, two, three, four, five, six, seven right, we've more difficulty! Do it like that one two, two.

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Because those are about equal distance apart, it would be one two four.

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They'll be approximately the same distance apart on over on a logarithmic scale, it's not going to scale.

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B

So I'm, going to start off baby divided by three, is on the whether array, it's a B, that's the distance, so one third of it is the distance right there. Okay, so one third of it is the distance right there and I just set this I'm setting this one as 1 meter, so that we're starting off with one meter between two inside electrodes. So.

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A B goes, oh names are aware now remark, oh my eyes to do it another one. It does have talent man so.

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This unit is smart now it knows that what the next thing when I push this button, it's actually going to be entering a number one or a decimal place, two to five six, seven, not the other things that are okay, so I'm hitting one enter.

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So now it gives you the positions of the electrodes that you have the current a is that one and a half meters fancy is that.

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One of the half beginners.

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The potential voltage that's M is that a half, a liter and n is that a half a meter. So at this point you would go and you put your electrodes and make sure you have the malls in position. You'd actually plan this out before you did the survey.

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Okay, so you've got everything hooked up now you have four wires running through the electrodes and then you do your measurement. Well, so you're saying that's good.

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Now what this system does is it checks and see see you have good contact with your electrodes, so we don't have good contact with the electrodes because we don't have electrodes in right now, but this should say maybe two kills.

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You want to be in that order. 2000 to 5000 ohms will pour water. Will bang the steak in further to make sure that we have a good connection.

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Some of you that are near the front can hear this going. Click, click click sound. Did anybody hear the sound water was going, click click click, Sergei was trata, was testing the potential electrodes and, of course it found the potential electrodes. We don't have them hooked up either, but this one should be in the same similar 2000, ohms, 5000 ohms, and that if you're happy with those, then you do your measurement. If you're not happy with them, then you have to reduce that contact. Resistance between your electrode and the ground.

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So this has to be connected to the soil electrically very well, and it does that by the soil particles touching it if the soil particles are dry, it doesn't connect very well. You have to pour water on it. Maybe salt water on it, bang it in further.

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Eaten 8287 see Miami what do I get that movie out, Tony I! Think of it. Let me Steve a captain will take you st., not allow me on our assignment Olivia I. Don't want an airport netiquette to tell hello, yeah, hello, PRA, so.

B

Dowdy keep your eyes on this very quickly. It's going to go very quickly, you're going to see the voltage and the current, and it will actually calculate the resistive, the apparent resistivity for YouTube. Unfortunately, the people that made this instrument in all their wisdom don't allow you to stop the screen and put the numbers to and write the numbers down. So what we often do is just take a picture of it.

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He will take me, they say: I'm, a parent down named grandparents, resistivity, dominantly, strong and.

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But it will offer you the opportunity to then save the data onto these feet.

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That is, they float. I know.

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It was still going: click click click because I was trying to get that measurement.

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So it's Disney 46, bolts, literature, Rho, V, I, cubes equality, I get me man call every glad state. For a long time. We actually met yeah.

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B

So now we have the choice of storing it, so this unit allows you to store up to forty four thousand eight hundred and twenty-five pieces of data. When we're doing our 2d surveys will be collecting somewhere between 1400 1400 and three thousand data points. So.

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uh Ad duplexing without money, knowledge to talk if you feed our zero to D some time, Loomis I know.

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When we're collecting this vertical electric sounding we're only collecting one data point at a time, if there's any electrical engineers here or people who understand electrical engineering,.

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Metric engineering or not it's not important and.

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Computers, it stores it in a stack, so it starts at the bottom, and the bottom number is zero.

A

How about the un-islamic and.

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If you're not comfortable with that, you can skip zero and you can save it in position, one so that when you collect 100 data points when you've out and download it, you don't have to spell that you're safe from 0 to 99. You can say from 1 to 100, see if everybody understands it.

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D

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One is on my metro: one: is it off one if I miss a jihadi man yeah, you know that Obama was out talking about dipping in power, so.

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Right now, because I already have some data on there, it's trying it's suggested that I should save it in position. Three three.

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Mom see ya mouth position.

B

So now it's just asking me: okay, there's already some data there. Are you alright to overwrite that data, so.

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They'd actually be diving over right. What do we mean by okay.

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It's going to wipe it erase the other data point and put.

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This new pointer, so override, gets out of the achievement in the house, kept it off. Where did that thing on your lap? So if.

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I say you can see it's saying no right now.

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So if I do my enter I'm going to say no I won't save it there and I can then put it in a different spot, so I think from 7:00 on it'll save it.

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It said 7:00 was a clear spot. I could save it.

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Then what we're going to do.

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So we moved to our next point so now we're if we did a move, it's going to shift this whole thing this way, but we don't want to do that because we're not trying to do a 2d servant, we're trying to do a survey straight down so.

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What these that mean up that will get this out. There moves around about MOOCs that I haven't good enough in the out.

B

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B

We're going to put a new point in or if we wanted to collect some more data. At the same point we could say: ok and we'll collect the data at the same point, any.

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Knee I'm a step, you know sub-elements and okay and they have a minute using a new point yeah. So some.

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People, especially with the system that Kevin used you get a single measurement, there's no averaging, you just have a voltmeter and you connect it to your electrodes and you get one reading, no average.

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Average might be given, as.

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C

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Every it's motoki! No, this.

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One's averaging about 200 readings, so you get a good average average, but some people like to collect at least four points at each spot.

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Initial game time, I need to need the point book in.

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B

We're not going to do that.

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B

We're going to choose a new position, so we're not going to move from the midpoint. This is going to stay at x, equals zero.

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You know my make better, see, don't love it and then one time of it.

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We're not changing why and so now our original measure who was done with the separation 1 meter, now we're going to do 2 meters.

B

And so now it's telling us these are the unit issues. The current electrode a is going to be at minus three current, be at three potential: minus 1/m, that's the M electrode and they an electrode a plus one. As.

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An acquisition, a tip on the apical yeah, everybody a rule but I want. ah Maybe we've got my time incident so.

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Now, they're, all two meters apart, we got our electrodes, we move them into position, we hook the wires and we're ready to do our next moister.

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Another no matter right now, let me desert had there's no need everybody. Okay,.

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So that's how this system works with the system that will have that Kevin is built, it's very similar, except that you're using a voltmeter. Instead of this doing you automatic measurement, for you want.

A

Ira will be done in on a the water ability both of ours in Judaism and about that paint are Ted. Who do you think it's happy I have enough, then.

B

One other thing that we do when were in the field. If we're doing a vertical electrical sound news is, we also do a sounding 90 degrees, rotated, I,.

A

Found in the report online, dr. Cara, oh no Daniel, which are not because ethically you do play below.

B

And so that helps you a little bit more understand the 3d ground problem, as opposed to just doing it in one direction.

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Communal value yeah, but.

B

We won't do that for tomorrow, but that's enough you've seen how this works and seen some of the stuff tomorrow, you'll get some hands-on and you can actually do it yourself.

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B

Else Kevin does that you want to say.

B

So so, tomorrow, we'll meet here at 9:00.

A

Do you have a phone I, so mom aunty we're not about and you.

B

Should wear clothing that you can bend over and banging in steaks stretch wire.

A

Alma to Louie Louie, ah who was doing angle yawns in the hall, so then I said: oh look at that neck over body will get me by you know.

C

B

We're still ducks dumb story to talk a little bit more, but we will do a health and safety, a short health and safety session tomorrow, because if you're putting two and a half am soon and 600 volts, then there's the possibility of shocking yourself.

B

Does everybody.

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Know it's a minor but the road. These safety.

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C

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You want the HDMI.

B

Are you hoping they're going to do something else introduce.

D

We'll see how their wait.

D

So how many people have managed to get the pre mayor done? Aurelia sounding.

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Who but happy happy beginning? Oh.

C

D

D

So what I, what I will do is just go over part of let's say the first question just so that everybody is familiar with the book, we're asking and then we're homework tonight. You can.

D

Look at the two apps, both the to mayor and the three layers.

A

Getting done, Aaron, lien xx, really a sheet I wanna. Give me Wow.

C

D

Question for question, one for the the three layer app really.

A

A happy a question about the Obama made it.

D

Says H 1 is 10 meters thanks.

A

Why not 10 feet under be hotter.

D

H2 at 5 meters is to define.

D

Rho 1 is 500, the one I am Rho, 2 is 50 and Rose 3 is 500, so we have a conductive layer.

D

Let's just look at the model.

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D

Here's the model we have a conductive player here in something it's much more resistant, so.

A

I'm excited machine there, no I agree, maybe but I contacted it therefore sit down now there today today, I got a resistivity in there, so.

D

What I'm asking you to do on right, you to start with, is to fill in this table.

A

Find that's not Allegiant energies, it's a Yahoo and.

D

In doing this, you'll get a good sense for the relationship between the length of the array and how deep your seam right.

A

Down looking at the bowel or I am Fantasyland I mentioned about us right. Well, we've got time for the mutant magnetic you are like $9 an hour. Oh, not imaginary,.

D

So you're asked to do: let's see a B upon 2 is equal to 5.

D

That's question one: so it's the table and something that you can do these books.

B

D

C

Put your speed.

B

D

So if we click on these numbers here, we can actually make them what we want.

A

Thank You dog attention another to tell you that body so.

D

If I click on this number, so sometimes the slider bar doesn't give you quite that number. So then you can click on this and print the number in nothing.

A

Much really not a body repeater, yes, I! Need you to advise of an interval teacher manana you guys. I am a petite attention in a pub a direct antibody.

D

And if that doesn't work, which it just didn't just do it as best you can't click the slider bar there seems to be a little bug. A second.

D

There we go so if.

D

So here I just left it at 4.5, where you should be able to type in the number, but somebody else it didn't work and it didn't work here so I'm not sure we'll take a look. I.

A

Was a Trudeau me analyst, you can shoot me happy to a number I mean I, think she's, a beautiful yeah, so just get.

D

Close if, instead of 38 be upon to you, have 31.5 define.

A

D

Idea with this exercise.

D

Is that if we look at small a be upon to.

D

So small a be upon two.

D

And then we look at the currents.

C

D

See that they're mostly up here and that the apparent resistivity was just close to five. So that's exactly what.

A

You're interested if I'm lucky fell, she met God, never got tired. The top of a crazy girl, a qualified okay. So.

D

This comes up to be people to be free system, any of the top layer, so.

A

That in bow yeah, let's uh anonymity resistivity to cool avocado and.

D

Then you're asked to just make the array continually larger. Look to see what the apparent resistivity is and make a connection with the with the currents down here. So.

A

I'm on maybe, if I would take it, if you don't know, buddy.

D

So the rest of the the other questions in here are kind of similar, but they're all designed to make you think about what is happening behind.

A

Both are equal on and moon. It's quite a take Makua man dick about this work. We should be thankful of people down a tourist route who rang knowledge is education? Can.

D

I ask are the questions literally worded so that they're understood but.

A

The way you know that I ain't gonna be having I, don't think question.

D

So that's your that's your homework for today, so exercises for the two apps that you use. So it's they're easy exercises. You just go in to fill something and but you you think, while you're doing it while you're looking at the pictures- and it can help us understand what the G Series.

A

Is to be determined is a battle without more anxiety, like that one, exactly there's no penalty and.

C

By the 1080p Nutella calendar, a beautiful array, so.

A

Rocky tonight well, I love them open an opportunity on go on x-ray. Now, like move for knowledge, I don't want to wrap it all in a diplomat.

D

Okay, so that's maybe that's enough for today: yeah Bob, a so again for those people who were unsuccessful with downloading the apps. Please try them tonight. You see Viper and at home, and then tomorrow we're going to the park to collect some data and then we'll bring the data back and plot up an apparent reach. The stupid perfume.

A

On gog.com iodine in my hair, so.

D

Fill up the tune, why I.

A

Love me either doing it I, don't see their God I'm gonna find out. If I guess they are so.

D

Fill out, the two question is questionnaires sign your name and bring them back here tomorrow. All righty.

C

A

Questions questioning the question individually me so what paper? What question says.

D

Yeah there's perfect.

A

Really, similarly, a foundation, yet the secret lair something specifically a punishment. The never talk about this is really about something.