US 12,181,548 B2 · Adaptive damping magnetic field sensor

Abstract

This application provides an adaptive damping magnetic field sensor, including: a receiving coil, an adaptive damping matching resistance circuit, and an amplifying circuit; where the receiving coil is used for receiving an earth response signal generated by the earth under excitation of an emission source, and generating an induced voltage; the adaptive damping matching resistance circuit is used for receiving the induced voltage generated by the receiving coil and automatically matching a damping resistance value to obtain a near-source broadband observation signal; and the amplifying circuit is used for amplifying the observation signal with a constant gain and outputting a sensor output signal. This application carries out automatic matching control on the damping resistance value through the adaptive damping matching resistance circuit, thereby ensuring that the sensor can stably and reliably implement fine observation of an earth response under near-source, broadband and complex scene conditions.

An adaptive damping magnetic field sensor, comprising:

a receiving coil, an adaptive damping matching resistance circuit, and an amplifying circuit;
wherein the receiving coil is used for receiving an earth response signal generated by the earth under excitation of an emission source, and generating an induced voltage;
the adaptive damping matching resistance circuit is used for receiving the induced voltage generated by the receiving coil and automatically matching a damping resistance value to obtain a near-source broadband observation signal;
and the amplifying circuit is used for amplifying the observation signal with a constant gain and outputting a sensor output signal;
the adaptive damping matching resistance circuit comprises:
a damping feedback circuit, a damping adjustment microcontroller, and a programmable resistor;
wherein the damping feedback circuit collects an input voltage of the amplifying circuit, the feedback signal outputted by the damping feedback circuit is connected to the damping adjustment microcontroller, the feedback signal is adjusted by the damping adjustment microcontroller to form a control signal of the programmable resistor, an output of the damping adjustment microcontroller transmits the control signal to the programmable resistor through a serial bus, the programmable resistor adjusts and outputs a matching damping resistance value after receiving the control signal transmitted through the serial bus, and multiple iterations are performed to obtain a damping coefficient;
the feedback signal is adjusted by the damping adjustment microcontroller to form the control signal of the programmable resistor comprises:
the damping adjustment microcontroller analyzes characteristics of the feedback signal, and uses a deviation from a linear time-invariant condition to an amplitude and phase of a transfer function in formulas below as a linear error quantization function, to analyze a distortion degree of the amplitude and a distortion degree of the phase;
error
A
(
ω
)
=
A
⁡
(
ω
)
-
A
⁡
(
ω
)
ω
→
0
A
⁡
(
ω
)
ω
→
0
=
ω
n
2
(
ω
n
2
-
ω
2
)
2
+
(
2
⁢
ξω
n
⁢
ω
)
-
1
⁢
error
ϕ
(
ω
)
=
ϕ
⁡
(
ω
)
-
ϕ
⁡
(
ω
)
ω
→
0
=
-
arctan
⁢
2
⁢
ξω
n
⁢
ω
ω
n
2
-
ω
2
+
2
⁢
ξ
⁢
ω
ω
n
whew
α
=
R
t
R
t
+
r
,
ξ
=
L
+
rR
t
⁢
C
2
⁢
(
r
+
R
t
)
⁢
R
t
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LC
,
and
⁢
ω
n
=
r
+
R
t
R
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LC
V
out
=
k
×
V
in
,
α is a direct current attenuation coefficient, ξ is a coil damping matching coefficient, ωn is a non-damping natural attenuation frequency, ω is a circular frequency, Rt is a matching resistance, r is an internal resistance, L is an inductance, C is a capacitance, and k is a gain;
let the distortion degree of the amplitude and the distortion degree of the phase be respectively equal to zero, to obtain an amplitude zero error damping matching coefficient and a phase zero error damping matching coefficient;
a damping coefficient is determined based on the amplitude zero error damping matching coefficient and the phase zero error damping matching coefficient;
and a matching resistance control value is generated by inverse calculation of the damping coefficient;
the damping coefficient is determined based on the amplitude zero error damping matching coefficient and the phase zero error damping matching coefficient comprises:
the amplitude zero error damping matching coefficient and the phase zero error damping matching coefficient are averaged, and an average value is used as the damping coefficient.

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Adaptive damping magnetic field sensor

Life of this patent

Adaptive damping magnetic field sensor

Life of this patent

Abstract

Claims6