Hi J_Player,
Could you please make another small test with your IR thermometer?
Really simple -->
Put on table (indoor) few paper sheets of different colour (black, white, red, etc..) and record Temp. readings for each colour (from same distance).
I had IR thermometer while ago ... It was very unstable I belive this issue has not changed in few years..or what?
Also all please remember what Geo posted on 08-31-2006
Quote:
Hi. I believe that the thermal camera is not good for treasure hunting. I have a very good and expensive thermal camera (about 40.000$ before 5 years by Agema ) and i made a test with it.
I placed in-depth a sheet-metal roughly 30 x 40 cm from in the soil 30 cm her outline he became perceptible for roughly 12 hours. Afterwards the byway of one day and after became balance of temperatures between soil and sheet-metal the thermal camera did not show difference of colours in the point that I placed the sheet-metal
Of course I do not know what will show if some object is in ground for a lot of years. If it had the possibility of detecting objects in the ground then they would be a horrible solution because it has the possibility of searching a big extent with one only photograph and afterwards in the computer we locate precisely the point with the different temperature.
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Very nice conducted tests from J_Player - congratulations. Maybe even dear Hung can learn something from you.
My only thought on this: With IR-thermometers/cameras you can measure temp. of only TOP surface of ground which is in constant interaction with air.... Add to this vegetation, relief, wind. Hey what are you actually measuring??
If someone would like to achieve any real detecting this way:
*Resolution 0.1 degree is not quite enough.. you can buy good 0.01 degree digital thermometer with RS232 interface for about 300eur.
*Timing is quite critical...
*Use a needle-type sensor to measure temp. directly under topsoil and vegetation (15cm).
*Work in predetermined (marked) grid and record readings.
*Plot the readings.
You can not find coins, etc. But you can discover whole buried city
.
I mean buried walls, ditches, wells, roads, BIG bronze statues
...