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Open Source Hardware
Forum Archaeology Resistivity Meter
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  • armp
  • archaeology resistivity meter
Related

Archaeology Resistivity Meter

kltm
kltm over 5 years ago

Hi I'm looking for ideas on an update to a resistivity meter for archaeology. The only published designs for diy were in 2 magazines. One was published in 1997 and the other in 2003. I have copies of both articles available. The reason behind this is the current high cost of available equipment, usually well beyond the reach of most archaeological groups. I've attached a basic block diagram. In the first magazine article the meter is very basic. It relied on the operators to write down the reading given as the survey was taken. Given that a normal survey grid is 20m x 20m and 1 reading is taken on every sq mtr there would be 400 readings to write down and then input into a program used to interpret the results. The later article is really an update to the first where a PIC has been added to record the readings. This again is prone to error, because eadings are taken manually by pressing a button.

I'm sure given the advances in electronics there must be better ways. 

 

 

 

image

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Top Replies

  • kltm
    kltm over 5 years ago in reply to michaelkellett +8
    Hi Michael This all sounds very interesting and encouraging. I see you have found the original article, the update is also on slideshare somewhere. I haven’t really thought much about cost, but as you…
  • michaelkellett
    michaelkellett over 5 years ago in reply to shabaz +7
    I can't live with that - I have to have symmetry The problem is that the Howland current pump doesn't constrain the voltage on the load at all when perfectly balanced - and my LTSpice model is unrealistically…
  • michaelkellett
    michaelkellett over 5 years ago in reply to michaelkellett +7
    AS promised - now for the phase sensitive detector. I couldn't easily model this in LTSpice, which is no great surprise because it needs multiplication and square roots. I used Simulink in MATLAB - which…
Parents
  • genebren
    genebren over 5 years ago

    Ken,

     

    Just a quick note.  A few years ago I had the opportunity to visit a local archaeological site (Friesnhahn Cave in Texas).  This is a relatively small cave, where one adult and two complete juvenile scimitar-tooth cats were found.  During the cave tour, the guide mentioned that they had completed and impedance grid study of the site and believe that the current cave is only the tip of the iceberg (they are still trying to secure funds to allow further exploration of the site).  There were several narrow branches leading away from the current cave in multiple directions.  The visit was so amazing, seeing multiple fossilized bones just poking out of the walls and down the branches was like having a portal to a distant time.

     

    I can see why this project is of interest of you and others like you.

     

    Keep looking and exploring!

     

    .

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  • fmilburn
    fmilburn over 5 years ago in reply to genebren

    When I was a boy there was a shell midden behind our house on the edge of town that was excavated and the local kids were allowed to participate.  I remember the squares that were laid out, the trowels, and using a rule to measure depth.  There weren't any grand discoveries but it was great fun.  That was many years ago.  The area is now filled in and there houses on top of what used to be a shallow horseshoe lake and woods.

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  • fmilburn
    fmilburn over 5 years ago in reply to genebren

    When I was a boy there was a shell midden behind our house on the edge of town that was excavated and the local kids were allowed to participate.  I remember the squares that were laid out, the trowels, and using a rule to measure depth.  There weren't any grand discoveries but it was great fun.  That was many years ago.  The area is now filled in and there houses on top of what used to be a shallow horseshoe lake and woods.

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