CN110764037A - Method and circuit for detecting and automatically recovering lock losing of aviation high-temperature superconducting full-tensor magnetic gradient instrument - Google Patents
Method and circuit for detecting and automatically recovering lock losing of aviation high-temperature superconducting full-tensor magnetic gradient instrument Download PDFInfo
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Abstract
The invention relates to a lock loss detection and automatic recovery method and a circuit of an aviation high-temperature superconducting full-tensor magnetic gradient instrument. The invention solves the problem that whether the SQUID magnetic sensor is unlocked or not is judged according to experience by needing experimenters to observe the output voltage signal of the SQUID magnetic sensor through naked eyes in the magnetic field measurement process, so that misjudgment is easily caused. Compared with the existing full tensor magnetic gradient instrument, the method based on the signal differential entropy is provided for detecting and judging the unlocking signal of the SQUID magnetic sensor, so that the accuracy of unlocking detection is improved, and the timeliness of reset operation is improved to a great extent.
Description
The technical field is as follows:
the invention relates to a high-temperature superconducting magnetic sensor lock-out detection and automatic recovery circuit, in particular to a high-temperature superconducting full-tensor magnetic gradiometer lock-out detection and automatic recovery method and circuit applied to an aviation mobile platform.
Background art:
superconducting Quantum Interference devices (SQUIDs) are currently known as magnetic vector sensors with the highest sensitivity, and have unique advantages in the fields of current geophysical exploration, underground and underwater hazard detection, military exploration and the like. Compared with the traditional ground total magnetic field intensity measurement and magnetic field three-component measurement technology, the aviation high-temperature superconducting full-tensor magnetic gradiometer built by the SQUID magnetic sensor can more conveniently and visually obtain geomagnetic field information, the number of measuring points is reduced to a great extent by utilizing magnetic gradient tensor data to position an abnormal body, the measurement efficiency is improved, and the aviation full-tensor magnetic gradient measurement system also has the series advantages of simple positioning algorithm, high positioning precision and the like, so that the aviation full-tensor magnetic gradient measurement undoubtedly becomes a research hotspot of magnetic prospecting.
Ideally, the aviation high-temperature superconducting full-tension magnetic gradient meter should stably operate at a selected operating point during the flight of an airplane, that is, external magnetic flux changes induced by the SQUID magnetic sensor are offset by magnetic flux generated by the feedback circuit, so that the SQUID magnetic sensor is kept in balance at the selected operating point. In the flight measurement process of the aviation high-temperature superconducting full-tensor magnetic gradient instrument, the stability of the working point of the SQUID magnetic sensor is crucial to the measurement of a magnetic field, but the stability of the SQUID magnetic sensor for a long time cannot be guaranteed due to the influence of various factors such as airplane flight attitude, motion noise and the like in the actual flight process, and once the change rate of a signal to be measured is greater than the slew rate of the SQUID magnetic sensor or the dynamic range of the signal to be measured is greater than the measurement range of the SQUID magnetic sensor, the SQUID magnetic sensor is unlocked. Once the SQUID magnetic sensor is unlocked, the integrator cannot work normally due to saturation, and at the moment, the integrator needs to be reset in time to recover measurement.
The conventional SQUID magnetic sensor resetting mode needs to be manually reset by experimenters on the ground. During ground measurement, experimenters observe waveforms of signals measured by the SQUID magnetic sensor in real time, and when finding that magnetic field signals exceed the maximum allowable output range of the SQUID magnetic sensor, the experimenters must manually open a reset button to complete reset, so that the SQUID magnetic sensor continues to work, but the SQUID magnetic sensor is not suitable for an aviation mobile platform. The aviation high-temperature superconducting full-tensor magnetic gradiometer is placed in a nacelle which is dozens of meters below a flight platform and cannot be touched by experimenters, and a manual reset mode after the SQUID magnetic sensor is unlocked is obviously impractical.
CN104950268A discloses a superconducting quantum interferometer magnetic sensor, which comprises: a superconducting quantum interference device; a preamplifier connected to the superconducting quantum interference device; the first feedback circuit is connected with the output end of the preamplifier and feeds back the output end of the preamplifier to the superconducting quantum interference device; the integrator is connected with the output end of the preamplifier; and the second feedback circuit is connected with the output end of the integrator and feeds back the output end of the integrator to the superconducting quantum interference device. According to the invention, the first feedback circuit is arranged behind the preamplifier, so that feedback magnetic flux can be output to the SQUID almost without delay, the change of external magnetic flux can be counteracted in time during the integral compensation processing of the integrator, and the stability of a working point is maintained. The invention has the advantages that: the SQUID magnetic sensor has faster speed response to a certain extent, and the lock loss caused by the time delay of the integrator is effectively reduced. However, the superconducting quantum interference device magnetic sensor disclosed in the patent only has applicability in an environment where the change rate of external magnetic flux is close to the cut-off frequency of the superconducting quantum interference device, and is not suitable for aviation mobile platforms with complicated and changeable magnetic interference.
CN105203978A discloses an unlocking reset compensation device and method for SQUID magnetic sensor, the device includes: a second SQUID device, a second feedback coil, and a second readout circuit; the second SQUID device and the SQUID magnetic sensor share a signal input coil, andthe coupling degree of the signal input coil is lower than that of a SQUID device in the SQUID magnetic sensor and the signal input coil; the second feedback coil and the second readout circuit convert magnetic flux induced by the second SQUID device into a second voltage signal; the unlocking compensation module differs an integer of magnetic flux quanta phi according to the working points of the first SQUID magnetic sensors before and after unlocking0The offset of the working points of the first SQUID magnetic sensor before and after unlocking is obtained by utilizing the variable quantity of the second voltage signal, so that the working points of the first SQUID magnetic sensor after unlocking are compensated to be consistent with those before unlocking. The invention has the advantages that: the SQUID magnetic sensor can be used for continuous measurement before and after unlocking reset, and has the characteristics of high sensitivity and wide range. However, the unlocking reset compensation device and method of the SQUID magnetic sensor disclosed in the patent need to consume a large number of devices, the circuit design difficulty is increased, the nacelle load is increased, and the device and method can only solve the problem of interruption of the output voltage signal of the SQUID magnetic sensor before and after unlocking reset, and a specific description is not given to the unlocking reset process.
In a paper of high-temperature superconducting full tensor magnetic gradient measurement technology research disclosed in the 6 th month in 2017 in Shenjing university, a magnetic measurement system is arranged in a lifting cabin which is dozens of meters below a flight platform, an upper computer is arranged in the flight platform, the upper computer and a lower computer adopt RS485 communication, and experimenters complete remote regulation and control of measurement channels in the flight platform in the magnetic field measurement process. The SQUID magnetic sensor state parameter remote control method mentioned in the paper realizes the separation of an operation interface and a control module, and further lays a foundation for magnetic field measurement based on an aviation mobile platform, but an airplane is influenced by the flight attitude of the airplane in the flight measurement process, RS485 remote communication is not ideal in imagination, manual intervention is still needed in the aspects of unlocking judgment of the SQUID magnetic sensor and recovery of a working point after unlocking, and due to the influence of various magnetic interferences, more than one SQUID magnetic sensor is possible to be unlocked at the same time, and at the moment, manual reset is sequentially carried out on each unlocking channel, so that the efficiency of the magnetic field measurement is reduced to a great extent.
The invention content is as follows:
the invention aims to provide a method for detecting and automatically recovering lock loss of an aviation high-temperature superconducting full-tensor magnetic gradient meter, which is suitable for an aviation mobile platform, aiming at the defects of the prior art;
the invention also aims to provide a circuit for realizing the method for detecting and automatically recovering the lock loss of the aviation high-temperature superconducting full-tensor magnetic gradient instrument.
The idea of the invention is that: the method is characterized in that a signal differential entropy-based method is provided for detecting and judging the unlocking signal of the SQUID magnetic sensor, an NI measurement and control module collects the output voltage of 8-path SQUID magnetic sensors in real time and detects an abnormal value, namely abnormal voltage, and once the abnormal voltage is detected, the SQUID magnetic sensor can be judged to be unlocked. The reset information is sent to the controller through the serial port line after the SQUID magnetic sensor is unlocked, at the moment, the controller enables the integrator reset switch of the corresponding channel in the multi-channel SQUID unlocking detection and automatic recovery circuit to be automatically closed for 1s, then the reset switch can be automatically disconnected, if the NI measurement and control module detects that the output voltage signal of the SQUID magnetic sensor is recovered to be normal, the reset operation is exited, and if not, the reset is carried out again until the SQUID magnetic sensor returns to a normal working state.
The purpose of the invention is realized by the following technical scheme:
the method for detecting and automatically recovering the lock loss of the aviation high-temperature superconducting full-tensor magnetic gradient instrument comprises the following steps of:
a. placing an aviation high-temperature superconducting full-tensor magnetic gradiometer in a nacelle, and presetting an unlocking detection and automatic recovery program in an NI measurement and control module 3;
b. after the airplane takes off, the airplane drags a pod to carry out aviation magnetic field measurement, and an NI measurement and control module 3 collects, processes, stores and detects output voltage signals of 8 SQUID magnetic sensors in real time;
c. the output voltage waveform change of the SQUID magnetic sensor during normal work is relatively smooth, when the unlocking occurs, the waveform will be subjected to mutation to reach the maximum allowable output voltage of the SQUID magnetic sensor and keep unchanged, the unlocking detection of the SQUID magnetic sensor is realized by a method for calculating differential entropy from the output voltage signal of the SQUID magnetic sensor, the differential entropy can obviously express signal singular points, and the formula for calculating the differential entropy is as follows:
wherein the content of the first and second substances,
D(n)＝f(n+1)-f(n)，n＝0,…,N-2； (3)
f (n) represents the voltage signal output by the SQUID magnetic sensor, D (n) represents the difference value of the voltage signal output by the SQUID magnetic sensor, and L represents the window length for solving the entropy value;
d. the NI measurement and control module 3 detects the differential entropy of the output voltage signal of the SQUID magnetic sensor in real time, if the differential entropy has obvious mutation and exceeds a threshold value A (the threshold value A is an empirical value), the SQUID magnetic sensor is preliminarily judged to be suspected to be unlocked, and if the differential entropy does not have obvious mutation, the SQUID magnetic sensor is judged to be unlocked normally;
e. if the differential entropy is changed into 0 immediately after obvious mutation and is maintained at a zero value and is unchanged, judging that the SQUID magnetic sensor is unlocked indeed, otherwise, judging that the SQUID magnetic sensor is an instantaneous pulse signal, and realizing the unlocking detection of the aviation high-temperature superconducting full-tensor magnetic gradient instrument in the flight measurement process;
f. after the SQUID magnetic sensor is unlocked, the NI measurement and control module 3 gives a reset command of a target unlocking channel;
g. the controller 4 receives a reset command sent by the NI measurement and control module 3 through a serial port line and gives a return value, and the controller 4 controls the multi-channel SQUID unlocking detection and automatically restores the integrator reset switch of the corresponding channel in the circuit 2 to be automatically closed for 1s and then disconnected;
h. and the NI measurement and control module 3 redetects the differential entropy of the SQUID magnetic sensor output voltage signal, if the differential entropy is restored to be normal, the resetting is successful, otherwise, the steps f-g are executed again until the resetting is successful, and thus the automatic restoration after the aviation high-temperature superconducting full-tensor magnetic gradient instrument is unlocked is realized.
A lock loss detection and automatic recovery circuit of an aviation high-temperature superconducting full-tension magnetic gradient instrument is characterized in that a full-tension magnetic gradient probe 1 is connected with an NI measurement and control module 3 through a multi-channel SQUID lock loss detection and automatic recovery circuit 2, the multi-channel SQUID lock loss detection and automatic recovery circuit 2 is connected with the NI measurement and control module 3 through a controller 4, and the NI measurement and control module 3 is composed of an NI9202 board 3a, an NI9870 board 3b, an NI9467 board 3c and an NI9401 board 3 d.
The multichannel SQUID lock loss detection and automatic recovery circuit 2 is characterized in that a SQUID magnetic sensor is connected with the positive input end of an amplifier through a low-temperature twisted pair, the output end of the amplifier is connected with the negative input end of an integrator through a resistor R, and the output end of the integrator is connected with an NI measurement and control module 3, so that the voltage signal of the SQUID magnetic sensor is collected in real time; the NI measurement and control module 3 is connected with the controller 4 through a serial port line, and a reset output port 4b of the controller 4 is connected with a reset switch of the integrator.
Has the advantages that: the invention solves the problem that whether the SQUID magnetic sensor is unlocked or not is judged according to experience by needing experimenters to observe the output voltage signal of the SQUID magnetic sensor through naked eyes in the magnetic field measurement process, and misjudgment is easily caused. Compared with the existing full tensor magnetic gradient instrument, the method based on the signal differential entropy is provided for detecting and judging the unlocking signal of the SQUID magnetic sensor, so that the accuracy of unlocking detection is improved, and the timeliness of reset operation is improved to a great extent.
Description of the drawings:
FIG. 1 is a block diagram of a circuit structure for detecting and automatically recovering lock loss of an aviation high-temperature superconducting full-tensor magnetic gradient instrument;
FIG. 2 is a circuit diagram of a multi-channel SQUID lock loss detection and automatic recovery circuit 2 shown in FIG. 1;
FIG. 3 is a flow chart of lock-out detection for aviation high-temperature superconducting full-tensor magnetic gradiometer
FIG. 4 is a flow chart of the automatic recovery of the aviation high-temperature superconducting full-tensor magnetic gradiometer
1 full tensor magnetic gradient probe, 2 multi-channel SQUID unlocking detection and automatic recovery circuit, 2a reset receiving port, 3NI measurement and control module, 3a NI9202 board, 3b NI9870 board, 3c NI9467 board, 3d NI9401 board, 3e communication interface, 4 controller, 4a receiving and transmitting control interface, 4b reset output port,
note: fig. 1 only marks 1 way of reset receiving port 2a and reset output port 4b of the 8 ways SQUID magnetic sensor, and 8 small squares in the figure represent 8 reset receiving ports and 8 reset output ports, respectively.
The specific implementation mode is as follows:
the invention is described in further detail below with reference to the following figures and examples:
the method for detecting and automatically recovering the lock loss of the aviation high-temperature superconducting full-tensor magnetic gradient instrument comprises the following steps of:
a. placing an aviation high-temperature superconducting full-tensor magnetic gradiometer in a nacelle, and presetting an unlocking detection and automatic recovery program in an NI measurement and control module 3;
b. after the airplane takes off, the airplane drags a pod to carry out aviation magnetic field measurement, and an NI measurement and control module 3 collects, processes, stores and detects output voltage signals of 8 SQUID magnetic sensors in real time;
c. the output voltage waveform change of the SQUID magnetic sensor during normal work is relatively smooth, when the unlocking occurs, the waveform will be subjected to mutation to reach the maximum allowable output voltage of the SQUID magnetic sensor and keep unchanged, the unlocking detection of the SQUID magnetic sensor is realized by a method for calculating differential entropy from the output voltage signal of the SQUID magnetic sensor, the differential entropy can obviously express signal singular points, and the formula for calculating the differential entropy is as follows:
wherein the content of the first and second substances,
D(n)＝f(n+1)-f(n)，n＝0,…,N-2； (3)
f (n) represents the voltage signal output by the SQUID magnetic sensor, D (n) represents the difference value of the voltage signal output by the SQUID magnetic sensor, and L represents the window length for solving the entropy value;
d. the NI measurement and control module 3 detects the differential entropy of the output voltage signal of the SQUID magnetic sensor in real time, if the differential entropy has obvious mutation and exceeds a threshold value A (the threshold value A is an empirical value), the SQUID magnetic sensor is preliminarily judged to be suspected to be unlocked, and if the differential entropy does not have obvious mutation, the SQUID magnetic sensor is judged to be unlocked normally;
e. if the differential entropy is changed into 0 immediately after obvious mutation and is maintained at a zero value and is unchanged, judging that the SQUID magnetic sensor is unlocked indeed, otherwise, judging that the SQUID magnetic sensor is an instantaneous pulse signal, and realizing the unlocking detection of the aviation high-temperature superconducting full-tensor magnetic gradient instrument in the flight measurement process;
f. after the SQUID magnetic sensor is unlocked, the NI measurement and control module 3 gives a reset command of a target unlocking channel;
g. the controller 4 receives a reset command sent by the NI measurement and control module 3 through a serial port line and gives a return value, and the controller 4 controls the multi-channel SQUID unlocking detection and automatically restores the integrator reset switch of the corresponding channel in the circuit 2 to be automatically closed for 1s and then disconnected;
h. and the NI measurement and control module 3 redetects the differential entropy of the SQUID magnetic sensor output voltage signal, if the differential entropy is restored to be normal, the resetting is successful, otherwise, the steps f-g are executed again until the resetting is successful, and thus the automatic restoration after the aviation high-temperature superconducting full-tensor magnetic gradient instrument is unlocked is realized.
A lock loss detection and automatic recovery circuit of an aviation high-temperature superconducting full-tension magnetic gradient instrument is characterized in that a full-tension magnetic gradient probe 1 is connected with an NI measurement and control module 3 through a multi-channel SQUID lock loss detection and automatic recovery circuit 2, the multi-channel SQUID lock loss detection and automatic recovery circuit 2 is connected with the NI measurement and control module 3 through a controller 4, and the NI measurement and control module 3 is composed of an NI9202 board 3a, an NI9870 board 3b, an NI9467 board 3c and an NI9401 board 3 d.
The multichannel SQUID lock loss detection and automatic recovery circuit 2 is characterized in that a SQUID magnetic sensor is connected with the positive input end of an amplifier through a low-temperature twisted pair, the output end of the amplifier is connected with the negative input end of an integrator through a resistor R, and the output end of the integrator is connected with an NI measurement and control module 3, so that the voltage signal of the SQUID magnetic sensor is collected in real time; the NI measurement and control module 3 is connected with the controller 4 through a serial port line, and a reset output port 4b of the controller 4 is connected with a reset switch of the integrator.
Example 1
A circuit for detecting lock loss and automatically recovering of an aviation high-temperature superconducting full-tensor magnetic gradient instrument is disclosed, for example, a reference numeral 2 in figure 1 is composed of a circuit diagram for detecting lock loss and automatically recovering of SQUID magnetic sensors of 8 channels, figure 2 is a circuit diagram for detecting lock loss and automatically recovering of the SQUID magnetic sensor of only one channel, 8 SQUID magnetic sensors are installed in a full-tensor magnetic gradient probe 1, 3 SQUID magnetic sensors are respectively arranged in the directions of an x axis and a y axis, two SQUID magnetic sensors are arranged in the direction of a z axis, and three groups of mutually perpendicular SQUID magnetic sensors form a tensor probe coordinate system for magnetic gradient tensor measurement; because the output voltage signal of the SQUID magnetic sensor is very weak, the full-tensor magnetic gradient probe 1 must be connected with the multi-channel SQUID unlocking detection and automatic recovery circuit 2, and the measured weak voltage signal is amplified and integrated; then, the voltage signal output end of the multi-channel SQUID lock loss detection and automatic recovery circuit 2 is connected to an NI9202 board card 3a in the NI measurement and control module 3, and at the moment, the NI measurement and control module 3 synchronously collects, processes, stores and detects output voltage signals of 8 SQUID magnetic sensors; the NI measurement and control module 3 is provided with a communication interface 3e connected with a transceiving control interface 4a arranged on the controller 4, and the rapid communication between the NI measurement and control module 3 and the controller 4 can be realized through a serial port line; the reset output port 4b arranged on the controller 4 is connected with the reset receiving port 2a arranged on the multi-channel SQUID lock loss detection and automatic recovery circuit 2, and the reset output port of the controller 4 is connected to the integrator reset switch of the corresponding channel in the multi-channel SQUID lock loss detection and automatic recovery circuit 2, so that the controller 4 can complete the integrator reset operation of the corresponding channel according to the received reset command.
As shown in figure 3, the NI measurement and control module 3 collects voltage signals output by the SQUID magnetic sensor in real time, obtains differential entropy from the collected signals, judges the unlocking signals by detecting the signal differential entropy, and indicates that the SQUID magnetic sensor is unlocked when the signal differential entropy changes to 0 and maintains the zero value unchanged after the signal differential entropy changes to obvious mutation, or else, the SQUID magnetic sensor works normally.
The automatic recovery process of the working point after the lock loss of the aviation high-temperature superconducting full-tensor magnetic gradient instrument is shown in fig. 4, when the SQUID magnetic sensor is unlocked, 1-path SQUID magnetic sensor is possible to be unlocked, multiple paths of SQUID magnetic sensors are also possible to be simultaneously unlocked, once the SQUID magnetic sensor is unlocked, the NI measurement and control module 3 sends channel information needing to be reset to the controller 4 through a serial port line, then the controller 4 completes multi-path SQUID lock loss detection and automatically recovers the automatic reset of the corresponding lock loss channel in the circuit 2, and sometimes the SQUID magnetic sensor can be returned to the normal working state by multiple resets.
The method for detecting and automatically recovering the lock loss of the aviation high-temperature superconducting full-tensor magnetic gradient instrument comprises the following steps of:
a. placing an aviation high-temperature superconducting full-tensor magnetic gradiometer in a nacelle, and presetting out-of-lock detection and automatic recovery software in an NI measurement and control module 3;
b. after the airplane takes off, a pod is dragged to carry out magnetic field measurement based on an aviation mobile platform, and an NI measurement and control module 3 collects, processes, stores and detects output voltage signals of 8-path SQUID magnetic sensors in real time;
c. the output voltage waveform change of SQUID magnetic sensor when normally working is comparatively mild, and when taking place the loss of lock this waveform will take place the sudden change and reach the maximum allowable output voltage of SQUID magnetic sensor and keep unchangeable, to this characteristics, this patent realizes SQUID magnetic sensor's loss of lock detection through the method of asking for differential entropy to SQUID magnetic sensor output voltage signal, and differential entropy can obviously show the signal singular point, and the formula of asking for differential entropy is:
wherein the content of the first and second substances,
D(n)＝f(n+1)-f(n)，n＝0,…,N-2；
in the formula, f (n) is a voltage signal output by the SQUID magnetic sensor, D (n) is a difference value of the voltage signal output by the SQUID magnetic sensor, L represents the window length for solving the entropy value, and the window length is not too long for simplifying the algorithm. The variation amplitude of each point of the voltage signal is obtained through the difference calculation of D (n), the variation weight of each point relative to the whole signal is obtained through P (n), then the entropy value summation is carried out on the variation weight of each point, and further the difference entropy H (n) is obtained, H (n) can well reflect the whole variation degree of the voltage signal, and the value can be used for rapidly distinguishing the normal voltage from the abnormal voltage.
d. The NI measurement and control module 3 detects the differential entropy of the output voltage signal of the SQUID magnetic sensor in real time, if the differential entropy has obvious mutation and exceeds a threshold value A (the threshold value A is an empirical value), the SQUID magnetic sensor is preliminarily judged to be suspected to be unlocked, and otherwise, the SQUID magnetic sensor works normally;
e. if the signal differential entropy is changed into 0 immediately after obvious mutation and is maintained in a zero-value state all the time, the SQUID magnetic sensor can be judged to be unlocked really, otherwise, the mutation signal which appears just now is an instantaneous pulse signal, and the unlocking detection of the aviation high-temperature superconducting full-tensor magnetic gradient instrument in the flight measurement process is realized;
f. when the SQUID magnetic sensor is unlocked, the NI measurement and control module 3 gives a reset command of a target unlocking channel, wherein the reset command can be a reset command of a single unlocking channel or a command for simultaneously resetting a plurality of unlocking channels;
g. as shown in fig. 2, the controller 4 receives a reset command sent by the NI measurement and control module 3 through a serial line and gives a return value, the controller 4 controls the integrator reset switch corresponding to the unlocking channel to be automatically closed for 1s, and then the reset switch is automatically opened;
h. and the NI measurement and control module 3 redetects the differential entropy of the SQUID magnetic sensor output voltage signal, if the differential entropy is recovered to be normal, the resetting is successful, otherwise, the steps f-g are executed again until the resetting is successful, and the automatic recovery after the lock of the aviation high-temperature superconducting full-tensor magnetic gradient instrument is lost is realized.
Claims (3)
1. A method for detecting and automatically recovering lock loss of an aviation high-temperature superconducting full-tensor magnetic gradient instrument is characterized by comprising the following steps of:
a. placing an aviation high-temperature superconducting full-tensor magnetic gradiometer in a nacelle, and presetting an unlocking detection and automatic recovery program in an NI measurement and control module (3);
b. after the airplane takes off, the airplane drags the nacelle to carry out aviation magnetic field measurement, and the NI measurement and control module (3) collects, processes, stores and detects output voltage signals of the 8-path SQUID magnetic sensor in real time;
c. the output voltage waveform change of the SQUID magnetic sensor during normal work is relatively smooth, when the unlocking occurs, the waveform will be subjected to mutation to reach the maximum allowable output voltage of the SQUID magnetic sensor and keep unchanged, the unlocking detection of the SQUID magnetic sensor is realized by a method for calculating differential entropy from the output voltage signal of the SQUID magnetic sensor, the differential entropy can obviously express signal singular points, and the formula for calculating the differential entropy is as follows:
wherein the content of the first and second substances,
D(n)＝f(n+1)-f(n)，n＝0,…,N-2； (3)
f (n) represents the voltage signal output by the SQUID magnetic sensor, D (n) represents the difference value of the voltage signal output by the SQUID magnetic sensor, and L represents the window length for solving the entropy value;
d. the NI measurement and control module (3) detects the differential entropy of the output voltage signal of the SQUID magnetic sensor in real time, if the differential entropy has obvious mutation and exceeds a threshold value A, the SQUID magnetic sensor is preliminarily judged to be suspected of losing lock, and if not, the SQUID magnetic sensor works normally;
e. if the differential entropy is changed into 0 immediately after obvious mutation and is maintained at a zero value and is unchanged, judging that the SQUID magnetic sensor is unlocked indeed, otherwise, judging that the SQUID magnetic sensor is an instantaneous pulse signal, and realizing the unlocking detection of the aviation high-temperature superconducting full-tensor magnetic gradient instrument in the flight measurement process;
f. after the SQUID magnetic sensor is unlocked, the NI measurement and control module (3) gives a reset command of a target unlocking channel;
g. the controller (4) receives a reset command sent by the NI measurement and control module (3) through a serial port line and gives a return value, and the controller (4) controls the multi-channel SQUID unlocking detection and automatically restores the integrator reset switch of the corresponding channel in the circuit (2) to be automatically closed for 1s and then disconnected;
h. and the NI measurement and control module (3) redetects the differential entropy of the SQUID magnetic sensor output voltage signal, if the differential entropy is restored to be normal, the resetting is successful, otherwise, the steps f-g are executed again until the resetting is successful, and thus the automatic restoration after the aviation high-temperature superconducting full-tensor magnetic gradient instrument is unlocked is realized.
2. A circuit for realizing the method of claim 1 is characterized in that a full tensor magnetic gradient probe (1) is connected with an NI measurement and control module (3) through a multi-channel SQUID loss-lock detection and automatic recovery circuit (2), the multi-channel SQUID loss-lock detection and automatic recovery circuit (2) is connected with the NI measurement and control module (3) through a controller (4), and the NI measurement and control module (3) is composed of an NI9202 board card (3a), an NI9870 board card (3b), an NI9467 board card (3c) and an NI9401 board card (3 d).
3. The circuit for realizing the method as claimed in claim 1, which is characterized in that the multi-channel SQUID loss-lock detection and automatic recovery circuit (2) is used for connecting the SQUID magnetic sensor with the positive input end of the amplifier through a low-temperature twisted pair, the output end of the amplifier is connected with the negative input end of the integrator through a resistor R, and the output end of the integrator is connected with the NI measurement and control module (3) to realize the real-time acquisition of the voltage signal of the SQUID magnetic sensor; the NI measurement and control module (3) is connected with the controller (4) through a serial port line, and a reset output port (4b) of the controller (4) is connected with a reset switch of the integrator.
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| CN113671582A (en) * | 2021-08-26 | 2021-11-19 | 吉林大学 | Electrical source induction-polarization effect detection method based on three-component SQUID |
| CN114035139A (en) * | 2021-11-16 | 2022-02-11 | 吉林大学 | Method for measuring crosstalk error between SQUID sensors |
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