Target response tester

[green]

Raining alot so I've been charting some targets. TRT_56, (left) different size wires, (middle) 20mm ring(open and closed)AWG19 and AWG10, (right) 20 and 40mm ring AWG 19 and 10. TRT_58, comparing signal strength at same distance from coil with some US coins with two coil sizes. Distance different for each coil. Trying to get a feeling why targets chart the way they do.

each division is 1.26 times the lower, three divisions two times

[green]

Raining alot so I've been charting some targets. TRT_56, (left) different size wires, (middle) 20mm ring(open and closed)AWG19 and AWG10, (right) 20 and 40mm ring AWG 19 and 10. TRT_58, comparing signal strength at same distance from coil with some US coins with two coil sizes. Distance different for each coil. Trying to get a feeling why targets chart the way they do.

each division is 1.26 times the lower, three divisions two times

Been reading coin ring test ITMD pages 53 and 248. Page 53 states a VLF and PI detected a copper penny with a 5/8inch hole a greater distance than the copper penny. TRT_58 includes a test with a copper and zinc penny not drilled and drilled with 5/8inch hole. The ring has a higher amplitude at start of decay after Tx off with a PI. Another PI test(IB coil)with the pennies, recording Tx on and Tx off(TRT_59). Tx on, the solid penny has higher amplitude, wondering if a VLF(2300Hz)would detect the drilled penny at a greater distance than the penny like ITMD. Tx on, the projected straight line decays are close to he same amplitude at start of Tx on. Wondering if it means anything. Tx off, the copper penny(drilled and not drilled)and zinc penny decay faster in the beginning. ITMD states the coin can be thought of as having multiple concentric rings, in which each ring supports an independent eddy current. Wondering what is happening in the coin at start of Tx off.

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ITMD page 249 has a concentric ring test using SWG22 wire. Did a test with AWG19. First chart, one ring at a time. Larger the ring higher the amplitude Tx on or off. Decay slopes similar. Second chart, adding rings increased amplitude vs single ring when Tx on. Adding rings decreased amplitude at start of decay vs single ring when Tx off. Adding rings decreased the decay slope Tx on or off.