Electric field sensing equipment based on rare earth nickel-based oxide and measuring method thereof

Abstract

The invention discloses electric field sensing equipment based on rare earth nickel-based oxide and a measuring method thereof. The equipment comprises a probe and a signal processing circuit, wherein the probe comprises a nickel-based oxide film and a ceramic substrate, and the nickel-based oxide film is used for modulating an electric field to be detected and an excitation signal and outputting the signal to be detected; the signal processing circuit comprises an excitation circuit and a measurement circuit. The excitation circuit is used for respectively outputting excitation signals to the probe and the measuring circuit; the measuring circuit receives the to-be-measured signal and then demodulates the to-be-measured signal so as to obtain an electric field intensity value. According to the electric field sensing equipment based on the rare earth nickel-based oxide, the electric field intensity to be measured is converted into the voltage signal through the hydrogen-induced phase change principle, and the problems that a common silver chloride electric field sensor is difficult to maintain, short in service life, high in manufacturing cost and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to an electric field sensing device based on rare earth nickel-based oxide and a measuring method thereof. Background Art

[0002] Electric field sensors are used to observe underwater electric fields and are widely used in marine geophysics such as oil and gas hydrate exploration, marine geology such as ocean ridge expansion and submarine volcanic subduction zones, and defense fields such as underwater targets. Electric field sensors are the core components of submarine electromagnetic receivers. The technical performance of the sensor determines the reliability and advancement of the entire machine.

[0003] Traditional underwater electric field measurement uses two independent electric field sensors to measure the potential difference ΔU between two points, and divides it by the sensor distance L to obtain the electric field strength E. The above traditional measurement methods use large electrode spacing to obtain a high signal-to-noise ratio, resulting in a large measurement equipment and limited field operations. Underwater electric field sensors are generally made of materials such as silver chloride, carbon fiber, and titanium oxide. Commonly used silver chloride electric field sensors have the disadvantages of difficult maintenance, short life, and high production cost. Summary of the invention

[0004] The present invention provides an electric field sensing device based on rare earth nickel-based oxide and a measuring method thereof, which are used to solve the problem that the traditional measurement method in the prior art relies on a large electrode spacing to obtain a high signal-to-noise ratio, resulting in a bulky measuring device and limited on-site operations. At the same time, there are also disadvantages such as difficult maintenance, short life and high production cost.

[0005] The present invention provides an electric field sensing device based on rare earth nickel-based oxide, the device comprising: a probe and a signal processing circuit; wherein the probe comprises: a nickel-based oxide film and a ceramic substrate, the nickel-based oxide film is used to modulate the electric field to be measured and the excitation signal and output the signal to be measured;

[0006] The signal processing circuit includes: an excitation circuit and a measurement circuit; the excitation circuit is used to output an excitation signal to the probe and the measurement circuit respectively; the measurement circuit receives the signal to be measured and then demodulates it to obtain the electric field strength value.

[0007] Optionally, the excitation signal is bipolar alternating current excitation.

[0008] Optionally, the excitation circuit includes: a single-chip microcomputer, a temperature-compensated crystal oscillator, a direct digital frequency synthesizer, a bandpass filter, a programmable gain amplifier and a voltage-to-current conversion circuit; the direct digital frequency synthesizer outputs a frequency-adjustable voltage signal under the control of the single-chip microcomputer and the drive of the temperature-compensated crystal oscillator, and suppresses out-of-band interference after passing through the bandpass filter; the programmable gain amplifier outputs an amplitude-adjustable voltage signal under the control of the single-chip microcomputer; and the voltage-to-current conversion circuit converts the voltage signal output by the programmable gain amplifier into a current signal to output the excitation signal.

[0009] Optionally, the measurement circuit includes: a preamplifier and an orthogonal demodulator; the preamplifier receives the signal to be measured, amplifies it, and outputs it to the orthogonal demodulator, and the orthogonal demodulator demodulates the signal to be measured to obtain an output signal corresponding to the electric field to be measured.

[0010] Optionally, the orthogonal demodulator includes: a driver, a phase shifter and two multipliers. The excitation signal is divided into two paths after passing through the driver. One path of the excitation signal is formed into a first reference signal after being phase-shifted 90° by the phase shifter, and the other path of the excitation signal is used as the second reference signal. The first reference signal and the second reference signal are respectively demodulated by two multipliers to obtain the sensor output signal in the measured signal to obtain the Q component and the I component, and then the electric field strength value is obtained; wherein the first reference signal and the second reference signal are orthogonal to each other.

[0011] The present invention provides a measurement method of an electric field sensing device based on rare earth nickel-based oxide, the method comprising:

[0012] The excitation circuit generates an excitation signal;

[0013] The excitation signal excites the nickel-based oxide film of the probe, and the nickel-based oxide film modulates the electric field E to be measured. x and outputting the test signal in parallel with the excitation signal;

[0014] The signal to be measured is input into a measuring circuit to demodulate the signal to be measured, thereby obtaining an electric field strength value.

[0015] Optionally, the method includes: applying the excitation signal at two ends of the nickel-based oxide film, measuring the resistance change at the other two ends of the nickel-based oxide film, and obtaining the resistivity change of the nickel-based oxide film, thereby obtaining the electric field strength value.

[0016] Optionally, the method further includes: extracting the amplitude and phase difference between the measured signal and the excitation signal by orthogonal demodulation to obtain the resistivity change of the nickel-based oxide film.

[0017] Optionally, the amplitude, frequency and phase of the excitation signal are adjustable.

[0018] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement any of the methods described above.

[0019] The electric field sensing device based on rare earth nickel-based oxide described in the embodiment of the present invention converts the electric field strength to be measured into a voltage signal through the hydrogen-induced phase change principle, thereby solving the problems of difficult maintenance, short life and high production cost of the commonly used silver chloride electric field sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of an electric field sensing device based on rare earth nickel-based oxide in an embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of an excitation circuit in an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of a measuring circuit in an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of an orthogonal demodulator in an embodiment of the present invention;

[0024] Figure 5 It is a flow chart of a measurement method of an electric field sensing device based on rare earth nickel-based oxide in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0027] The embodiment of the present invention provides an electric field sensing device based on rare earth nickel-based oxide, such as Figure 1 As shown, the device comprises: a probe 1 and a signal processing circuit 2;

[0028] The probe 1 includes: a nickel-based oxide film and a ceramic substrate, wherein the nickel-based oxide film is used to modulate the electric field to be measured and the excitation signal and output the signal to be measured. Among them, the essence of the electric field sensing device based on the rare earth nickel-based oxide film is to convert the electric field strength to be measured into a voltage signal. In the embodiment of the present invention, the nickel-based oxide film adopts samarium nickelate ReNiO3, and its working principle is based on the hydrogen-induced phase change principle. Because samarium nickelate ReNiO3 is a rare earth nickelate with a perovskite structure, it belongs to a quantum material with strong electron correlation, imitating the electric field perception principle of marine organisms. Under the action of the electric field of the seawater environment, H+ enters the samarium nickelate lattice to form hydrogenated samarium nickelate. This proton flow causes the 3d orbital electronic configuration of the nickel atom to change, and the resistance characteristics are greatly changed, resulting in a strong Mott-Hubbard inter-electron interaction, and the material is transformed from a metal to an insulator. The ceramic substrate can play an insulating role.

[0029] The signal processing circuit 2 includes: an excitation circuit 20 and a measurement circuit 21; the excitation circuit 20 is used to output an excitation signal to the probe 1 and the measurement circuit 21 respectively; the measurement circuit 21 receives the signal to be measured and demodulates it to obtain the electric field strength value. The excitation circuit 20 outputs an excitation signal to the probe and applies it to the electric field to be measured so that the nickel-based oxide film modulates the electric field to be measured and the excitation signal, and obtains the signal to be measured. According to the hydrogen-induced phase change principle, the signal to be measured is the modulation result of the electric field to be measured and the excitation signal. After receiving the signal to be measured output by the probe 1, the measurement circuit 21 demodulates the signal to be measured under the reference of the base frequency.

[0030] Specifically, in the electric field sensing device based on nickel-based oxide film, a specific excitation signal is applied to both ends of the nickel-based oxide film. There is a certain functional relationship between the resistivity of the nickel-based oxide film and the electric field strength of the electric field to be measured. The resistance change is measured at the other two ends of the nickel-based oxide film, and the resistivity change of the nickel-based oxide film is obtained through a signal processing circuit, thereby achieving the purpose of indirectly measuring the external electric field strength.

[0031] The electric field sensing device based on rare earth nickel-based oxide described in the embodiment of the present invention converts the electric field strength to be measured into a voltage signal through the hydrogen-induced phase change principle, thereby solving the problems of difficult maintenance, short life and high production cost of the commonly used silver chloride electric field sensor.

[0032] The electric field sensing device based on rare earth nickel-based oxide described in the specific embodiment of the present invention is preferably a bipolar alternating current excitation. The constant current source has the disadvantages of large DC drift and low sensitivity, which affects the accuracy of electric field measurement. Therefore, an AC excitation scheme is adopted in the specific embodiment of the present invention. When the electric field to be measured is constant, the signal change at the output end of the nickel-based oxide film induction is related to the peak value and frequency of the AC excitation current. By changing the peak value and frequency of the excitation frequency, the sensitivity optimization design is obtained. Different from the existing DC excitation, at a certain frequency, the current that excites the nickel-based oxide film switches between positive and negative, and the positive and negative durations are equal, and the current peak is constant. In the embodiment of the present invention, AC excitation can effectively suppress DC drift, change the excitation frequency domain and amplitude, and improve the sensitivity of the electric field sensing device, so that the electric field sensing device based on nickel-based oxide has the advantages of small drift, small size, and high measurement accuracy.

[0033] The electric field sensing device based on rare earth nickel-based oxide described in the specific embodiment of the present invention is preferably, Figure 2 As shown, the excitation circuit 20 includes: a single-chip microcomputer MCU 201, a temperature-compensated crystal oscillator TCXO 202, a direct digital frequency synthesizer DDS203, a bandpass filter BPF 204, a programmable gain amplifier PGA 205, and a voltage-current conversion circuit V / I 206; the direct digital frequency synthesizer DDS203 outputs a frequency-adjustable voltage signal under the control of the single-chip microcomputer MCU 201 and the drive of the temperature-compensated crystal oscillator TCXO 202, and suppresses out-of-band interference after passing through the bandpass filter BPF 204, the programmable gain amplifier PGA 205 outputs an amplitude-adjustable voltage signal under the control of the single-chip microcomputer MCU 201, and the voltage-current conversion circuit V / I 206 converts the voltage signal output by the programmable gain amplifier PGA 205 into a current signal to output the excitation signal. Specifically, the excitation circuit described in the embodiment of the present invention realizes an excitation signal with adjustable amplitude and frequency of the alternating current. Among them, DDS203 can output a frequency-adjustable signal under the control of MCU201 and the drive of TCXO202; out-of-band interference is suppressed after passing through a bandpass filter; PGA205 realizes adjustable voltage signal amplitude under the control of MCU201, and finally outputs an amplitude-adjustable current signal as an excitation signal after V / I conversion of the voltage signal with adjustable amplitude and frequency.

[0034] The electric field sensing device based on rare earth nickel-based oxide described in the specific embodiment of the present invention is preferably, Figure 3As shown, the measuring circuit 21 includes: a preamplifier 210 and an orthogonal demodulator 211; the preamplifier 210 receives the signal to be measured and outputs it to the orthogonal demodulator 211 after amplification, and the orthogonal demodulator 211 demodulates the signal to be measured to obtain the output signal corresponding to the electric field to be measured. Specifically, after the signal to be measured is output from the probe, it is amplified by the preamplifier 210 and then filtered by a bandpass filter (not shown in the figure). Orthogonal demodulation is performed under the reference of the base frequency, and the output of the low-pass filter (not shown in the figure) is the output voltage of the sensing device, and finally the voltage conversion of the electric field strength to be measured is realized.

[0035] The electric field sensing device based on rare earth nickel-based oxide described in the specific embodiment of the present invention is preferably, Figure 4 As shown, the orthogonal demodulator includes: a driver 2110, a phase shifter 2111 and two multipliers 2112 and 2113. The excitation signal is divided into two paths after passing through the driver. One path of the excitation signal is formed into a first reference signal after being phase-shifted by 90° by the phase shifter 2111, and the other path of the excitation signal is used as a second reference signal. The first reference signal is input to the multiplier 2113, and the second reference signal is input to the multiplier 2112 to demodulate the sensor output signal in the signal to be measured, and the Q component and the I component are obtained respectively, so as to obtain the electric field strength value; wherein the first reference signal and the second reference signal are orthogonal to each other. When the nickel-based oxide film is driven by the alternating current, the signal output by the induction end is consistent with the frequency of the alternating current change, and is modulated by the excitation signal. Therefore, during demodulation, the excitation signal is used as the reference signal, and the orthogonal demodulation method is adopted to obtain the amplitude and phase angle of the signal to be measured and the excitation signal, and then the electric field strength of the electric field to be measured is calculated.

[0036] Different from the traditional method of measuring the potential difference between two spatial positions to obtain the electric field, the electric field sensing device based on rare earth nickel-based oxide described in the specific embodiment of the present invention greatly reduces the volume of the measuring device by not requiring a long pole distance configuration, and does not require special maintenance to improve the offshore operation efficiency of the instrument, and is more suitable for array observation scenarios of local electric fields. In addition, a bipolar alternating current is used as the excitation signal, and the amplitude A, period T, and phase φ of the alternating current are all adjustable. The sensitivity optimization design of the sensing device can be realized, and the sensitivity coefficient of the electric field sensing device can be improved.

[0037] The embodiment of the present invention also discloses a measurement method of an electric field sensing device based on rare earth nickel-based oxide, such as Figure 5 As shown, the method includes:

[0038] Step 501: The excitation circuit generates an excitation signal; specifically, the excitation signal is output to the probe and the measurement circuit respectively.

[0039] Step 502: The excitation signal excites the nickel-based oxide film of the probe, and the nickel-based oxide film modulates the electric field Ex to be measured and the excitation signal and outputs the signal to be measured. Specifically, according to the hydrogen-induced phase transition principle, the signal to be measured is the modulation result of the electric field to be measured and the excitation signal.

[0040] Step 503, input the signal to be measured into the measurement circuit to demodulate the signal to be measured, and then obtain the electric field strength value. Specifically, in the electric field sensing device based on the nickel-based oxide film, a specific excitation signal is applied to both ends of the nickel-based oxide film to generate a signal to be measured, and the signal to be measured is demodulated by the measurement circuit to finally obtain the electric field strength value of the electric field to be measured.

[0041] The measurement method of the electric field sensing device based on rare earth nickel-based oxide described in the embodiment of the present invention preferably includes: applying the excitation signal to the two ends of the nickel-based oxide film, measuring the resistance change at the other two ends of the nickel-based oxide film, and obtaining the resistivity change of the nickel-based oxide film, thereby obtaining the electric field strength value. Specifically, there is a certain functional relationship between the resistivity of the nickel-based oxide film and the electric field strength of the electric field to be measured, measuring the resistance change at the other two ends of the nickel-based oxide film, and obtaining the resistivity change of the nickel-based oxide film, thereby achieving the purpose of indirectly obtaining the electric field strength value.

[0042] The measurement method of the electric field sensing device based on rare earth nickel-based oxide described in the embodiment of the present invention preferably further includes: extracting the amplitude and phase difference between the measured signal and the excitation signal by orthogonal demodulation to obtain the resistivity change of the nickel-based oxide film.

[0043] In the measurement method of the electric field sensing device based on rare earth nickel-based oxide described in the embodiment of the present invention, preferably, the amplitude and period of the excitation signal are adjustable. In the specific embodiment of the present invention, an AC excitation scheme is adopted. When the electric field to be measured is constant, the signal change at the inductive output end of the nickel-based oxide film is related to the peak value and frequency of the AC excitation current. By changing the peak value and frequency of the excitation frequency, the sensitivity optimization design is obtained. Different from the existing DC excitation, at a certain frequency, the current that excites the nickel-based oxide film switches between positive and negative, and the positive and negative durations are equal, and the current peak is constant. In the embodiment of the present invention, AC excitation can effectively suppress DC drift, change the excitation frequency domain and amplitude, and improve the sensitivity of the electric field sensing device, so that the electric field sensing device based on nickel-based oxide has the advantages of small drift, small size, and high measurement accuracy.

[0044] An embodiment of the present invention further provides a computer-readable storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors to implement the method described in any of the above specific embodiments.

[0045] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0046] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0047] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0049] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. An electric field sensing device based on rare earth nickel-based oxide, characterized in that: The device includes: a probe and a signal processing circuit; wherein, The probe comprises: a nickel-based oxide film and a ceramic substrate, wherein the nickel-based oxide film is used to modulate the electric field to be measured and the excitation signal and output the signal to be measured; The signal processing circuit includes: an excitation circuit and a measurement circuit; the excitation circuit is used to output excitation signals to the probe and the measurement circuit respectively; the measurement circuit receives the signal to be measured and demodulates it to obtain the electric field strength value.

2. The electric field sensing device based on rare earth nickel-based oxide according to claim 1, characterized in that: The excitation signal is a bipolar alternating current excitation.

3. The electric field sensing device based on rare earth nickel-based oxide according to claim 1, characterized in that: The excitation circuit includes: a single-chip microcomputer, a temperature-compensated crystal oscillator, a direct digital frequency synthesizer, a bandpass filter, a programmable gain amplifier and a voltage-to-current conversion circuit; the direct digital frequency synthesizer, under the control of the single-chip microcomputer and the drive of the temperature-compensated crystal oscillator, outputs a frequency-adjustable voltage signal, which suppresses out-of-band interference after passing through the bandpass filter; the programmable gain amplifier, under the control of the single-chip microcomputer, outputs an amplitude-adjustable voltage signal; and the voltage-to-current conversion circuit converts the voltage signal output by the programmable gain amplifier into a current signal to output the excitation signal.

4. The electric field sensing device based on rare earth nickel-based oxide according to claim 1, characterized in that: The measurement circuit includes: a preamplifier and an orthogonal demodulator; the preamplifier receives the signal to be measured, amplifies it, and outputs it to the orthogonal demodulator, which demodulates the signal to be measured to obtain an output signal corresponding to the electric field to be measured.

5. The electric field sensing device based on rare earth nickel-based oxide according to claim 4, characterized in that: The orthogonal demodulator includes: a driver, a phase shifter and two multipliers. The excitation signal is divided into two paths after passing through the driver. One excitation signal is formed into a first reference signal after being phase-shifted by 90 degrees by the phase shifter, and the other excitation signal is used as a second reference signal. The first reference signal and the second reference signal are respectively demodulated by two multipliers to obtain the sensor output signal in the measured signal to obtain the Q component and the I component, thereby obtaining the electric field strength value; wherein the first reference signal and the second reference signal are orthogonal to each other.

6. A measurement method for an electric field sensing device based on rare earth nickel-based oxide, characterized in that: The method comprises: The excitation circuit generates an excitation signal; The excitation signal excites the nickel-based oxide film of the probe, and the nickel-based oxide film modulates the electric field E to be measured. x outputting the signal to be measured in parallel with the excitation signal; The signal to be measured is input into a measuring circuit to demodulate the signal to be measured, thereby obtaining an electric field strength value.

7. The measurement method of the electric field sensing device based on rare earth nickel-based oxide according to claim 6, characterized in that: The method includes: applying the excitation signal to two ends of the nickel-based oxide film, measuring the resistance change at the other two ends of the nickel-based oxide film, and obtaining the resistivity change of the nickel-based oxide film, thereby obtaining the electric field strength value.

8. The measurement method of the electric field sensing device based on rare earth nickel-based oxide according to claim 7, characterized in that: The method further includes: extracting the amplitude and phase difference between the signal to be measured and the excitation signal through orthogonal demodulation to obtain the resistivity change of the nickel-based oxide film.

9. The measurement method of the electric field sensing device based on rare earth nickel-based oxide according to claim 6, characterized in that: The amplitude, frequency and phase of the excitation signal are all adjustable.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the method according to any one of claims 6 to 9.

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