US 12,379,519 B2
Reception compensation apparatus based on airborne transient electromagnetic method
Qihui Zhen, Beijing (CN); and Qingyun Di, Beijing (CN)
Assigned to INSTITUTE OF GEOLOGY AND GEOPHYSICS, THE CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed by INSTITUTE OF GEOLOGY AND GEOPHYSICS, THE CHINESE ACADEMY OF SCIENCES, Beijing (CN)
Filed on Sep. 19, 2022, as Appl. No. 17/947,199.
Prior Publication US 2023/0008656 A1, Jan. 12, 2023
Int. Cl. G01V 3/10 (2006.01); G01V 3/16 (2006.01); G01V 3/165 (2006.01)
CPC G01V 3/107 (2013.01) [G01V 3/16 (2013.01); G01V 3/165 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A reception compensation apparatus based on an airborne transient electromagnetic method, comprising:
a receiver coil;
a transmitter coil, disposed around a periphery of the receiver coil;
at least one compensation magnetic core, disposed around an outer surface of the transmitter coil; and
at least one compensation coil, each of the at least one compensation coil is wound exclusively around a corresponding one of the at least one compensation magnetic core;
an addition/subtraction circuit, the addition/subtraction circuit being connected to the compensation coil and the receiver coil, wherein the addition/subtraction circuit comprises a first amplifier, a second amplifier, a third amplifier, a first resistor, a second resistor, a third resistor, and a capacitor; wherein a signal picked up by the receiver coil is fed to a non-inverting terminal of the first amplifier, an inverting terminal of the first amplifier is directly connected to an output terminal of the first amplifier through a wire, and the output terminal of the first amplifier is connected to one end of the first resistor, and the other end of the first resistor is directly coupled to a final desired compensated signal; wherein a signal picked up by the at least one compensation coil is fed to one terminal of the capacitor, the other terminal of the capacitor is connected to an inverting terminal of the second amplifier and to one end of the third resistor, wherein a non-inverting terminal of the second amplifier is grounded, and the other end of the third resistor is connected to an output terminal of the second amplifier, which is further connected to a non-inverting terminal of the third amplifier; wherein an inverting terminal of the third amplifier is directly connected to an output terminal of the third amplifier through a wire, and the output terminal of the third amplifier is connected to one end of the second resistor, and the other end of the second resistor is directly coupled to the final desired compensated signal.