DD coil signal shape change

[DJSUOL]

If the pulse is sent to the transmitter coil, will the shape of the received signal change in a DD coil? According to the test, the spike signal is transmitted through the transmitter coil but the received signal becomes damping I think. Why will it happen?

[kt315]

If the pulse is sent to the damped transmitter coil, or,,, what you meant?
the received signal becomes damping I think on damped receive coil, or,,, what you meant?

[DJSUOL]

If I increase the inductance of coil by increasing the coil size and turns, will the detection distance increase and why?

[Carl-NC]

If the pulse is sent to the transmitter coil, will the shape of the received signal change in a DD coil? According to the test, the spike signal is transmitted through the transmitter coil but the received signal becomes damping I think. Why will it happen?
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Without knowing what your transmit signal looks like it's difficult to answer. But generally in a PI-IB system the RX signal is a minimal transient and has a tendency to ring unless the RX coil is damped.

If I increase the inductance of coil by increasing the coil size and turns, will the detection distance increase and why?

Which coil?

[kt315]

If I increase the inductance of coil by increasing the coil size and turns, will the detection distance increase and why?

we use different way to increase the depth. we call that PULSE WIDTH. in Delta Pulse you can change PULSE WIDTH from 40us to 500us.
you see - here is not size of coil and turns. just TX POWER, TX ENERGY. we must operate ONLY in ENERGY category.