CN113124995B - Noise detection method of orthogonal fundamental mode fluxgate sensor noise detection device - Google Patents
Noise detection method of orthogonal fundamental mode fluxgate sensor noise detection device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/02—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by magnetic means, e.g. reluctance
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
Abstract
The embodiment of the invention provides a noise detection method of a noise detection device of an orthogonal fundamental mode fluxgate sensor, wherein the noise detection method comprises the following steps: noise detection is carried out based on the probe and the signal processing circuit, and the total noise of the sensor is evaluated; noise detection is carried out on the basis of the probe replacing circuit and the signal processing circuit, and self noise of the signal processing circuit is evaluated; evaluating probe self-noise based on the sensor total noise and the signal processing circuit self-noise. According to the method provided by the embodiment of the invention, the probe substitution circuit is arranged to be matched with the signal processing circuit for noise detection, the self noise of the signal processing circuit is obtained, and then the self noise of the probe is obtained based on the total noise of the sensor, so that the noise separation detection of the probe and the signal processing circuit is realized, data support is provided for realizing targeted noise optimization design of the sensor, and the noise optimization design effect of the sensor is improved.
Description
Technical Field
The invention relates to the technical field of noise detection, in particular to a noise detection method of a noise detection device of an orthogonal fundamental mode fluxgate sensor.
Background
The fluxgate sensor is a common weak magnetic detection sensor and is widely applied to the fields of medical treatment, geophysical exploration, space physics, underwater magnetic anomaly detection and the like. The orthogonal base mode fluxgate sensor adopts a unipolar current source to excite an amorphous wire, detects a signal modulated by an external magnetic field to be detected with the help of a pickup coil at the same frequency, outputs a voltage signal linearly related to the external magnetic field to be detected through a signal processing circuit, and has the advantages of low noise, small volume and wide frequency band.
The noise level is one of the key technical parameters of the orthogonal fundamental mode fluxgate sensor, and the optimization of the noise level is also the development process and the key steps of the orthogonal fundamental mode fluxgate sensor. The orthogonal fundamental mode fluxgate sensor is characterized in that noise mainly comes from a probe and a signal processing circuit. When the orthogonal fundamental mode fluxgate sensor works in an open loop, a front-end input end in the signal processing circuit can be short-circuited, and the noise power spectral density of the output end of the signal processing circuit is measured, so that the equivalent input noise of the signal processing circuit can be obtained. However, the open-loop measurement has the defects of limited range, poor linearity, poor frequency response and the like, and most orthogonal fundamental mode fluxgate sensors work in a closed-loop state. The closed loop state can lead to the introduction of feedback, and the feedback signal acts on the pickup coil of the probe, so that the noise test method of the signal measurement circuit fails.
Because the existing noise detection method cannot independently evaluate the noise contributions of the probe and the signal processing circuit, a sensor developer cannot respectively carry out noise optimization design based on the probe and the signal processing circuit, and the current noise optimization design has extremely poor pertinence and poor effect.
Disclosure of Invention
The embodiment of the invention provides a noise detection method of a noise detection device of an orthogonal fundamental mode fluxgate sensor, which is used for solving the problem that the noise optimization design effect is poor due to the fact that the noise contributions of a probe and a signal processing circuit cannot be independently evaluated by the existing noise detection method.
In a first aspect, an embodiment of the present invention provides a noise detection method for a noise detection device for a flux gate sensor in an orthogonal fundamental mode, where the noise detection device for a flux gate sensor in an orthogonal fundamental mode includes a probe, a probe substitution circuit, and a signal processing circuit, where the probe substitution circuit is a response circuit established based on the probe principle; the probe is used for matching with the signal processing circuit to detect noise and evaluate the total noise of the sensor; the total noise of the sensor consists of probe self-noise and signal processing circuit self-noise; the probe substitution circuit is used for being matched with the signal processing circuit to carry out noise detection and evaluating the self noise of the signal processing circuit; the probe replacing circuit comprises an adder and a multiplier, wherein the output end of the adder is connected with the input end of the multiplier; the adder is used for making a difference between the magnetic field to be measured and the feedback magnetic field to obtain a magnetic field difference value; the multiplier is used for multiplying the magnetic field difference value by the excitation current to obtain the simulation output of the probe; the adder and the multiplier are constructed based on an operational amplifier;
the noise detection method comprises the following steps:
noise detection is carried out based on the probe and the signal processing circuit, and the total noise of the sensor is evaluated;
noise detection is carried out on the basis of the probe replacing circuit and the signal processing circuit, and self noise of the signal processing circuit is evaluated;
evaluating probe self-noise based on the sensor total noise and the signal processing circuit self-noise.
In a second aspect, an embodiment of the present invention provides a noise detection system based on the orthogonal basis mode fluxgate sensor noise detection apparatus as provided in the first aspect, including:
the sensor total noise detection unit is used for carrying out noise detection based on the probe and the signal processing circuit and evaluating the total noise of the sensor;
the signal processing circuit self-noise detection unit is used for carrying out noise detection based on the probe substitution circuit and the signal processing circuit and evaluating the self-noise of the signal processing circuit;
and the probe self-noise detection unit is used for evaluating the probe self-noise based on the total noise of the sensor and the self-noise of the signal processing circuit.
In a third aspect, an embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a bus, where the processor, the communication interface, and the memory complete communication with each other through the bus, and the processor may call a logic instruction in the memory to perform the steps of the method as provided in the second aspect.
In a fourth aspect, embodiments of the present invention provide a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the method as provided in the second aspect.
According to the noise detection method of the orthogonal fundamental mode fluxgate sensor noise detection device provided by the embodiment of the invention, the probe substitution circuit is arranged to be matched with the signal processing circuit for noise detection, the self noise of the signal processing circuit is obtained, and then the self noise of the probe is obtained based on the total noise of the sensor, so that the noise separation detection of the probe and the signal processing circuit is realized, data support is provided for realizing targeted noise optimization design of the sensor, and the noise optimization design effect of the sensor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a noise detection apparatus of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative circuit for a probe provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of an alternative circuit for a probe according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a method for detecting noise of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a noise detection system of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Description of reference numerals:
110-a probe; 120-probe replacement circuit; 130-a signal processing circuit;
111-amorphous wire; 112-a pick-up coil; 121-an adder;
122-a multiplier; 131-a clock generation circuit; 132-a pump circuit;
133-a preamplifier; 134-band pass filter; 135-phase sensitive detector;
136-an integrator; 137-low pass filter; 138-feedback circuitry.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The noise contribution of the probe and the noise contribution of the signal processing circuit cannot be evaluated independently by the conventional noise detection method, and developers cannot respectively carry out noise optimization design based on the probe and the signal processing unit, so that the noise optimization design is extremely poor in pertinence and poor in effect. In view of the above, the embodiment of the present invention provides an orthogonal fundamental mode fluxgate sensor noise detection apparatus, which is used for separately evaluating noise contributions of two parts, namely a probe and a signal processing circuit. Fig. 1 is a schematic structural diagram of a noise detection apparatus for a fluxgate sensor in orthogonal fundamental mode according to an embodiment of the present invention, as shown in fig. 1, the apparatus includes a probe 110, a probe replacement circuit 120 and a signal processing circuit 130, where the probe replacement circuit 120 is a response circuit established based on the principle of the probe 110; wherein, the probe 110 is used for cooperating with the signal processing circuit 130 to detect noise and evaluate the total noise of the sensor; the total sensor noise consists of probe 110 noise and signal processing circuit 130 noise; the probe substitute circuit 120 is used in conjunction with the signal processing circuit 130 for noise detection and evaluation of the signal processing circuit 130 noise.
Specifically, the orthogonal fundamental mode fluxgate sensor is composed of two parts, i.e., the probe 110 and the signal processing circuit 130. In the noise detection process, in order to respectively acquire the noise of the probe 110 and the noise of the signal processing circuit 130, the probe substitute circuit 120 is arranged to simulate the electrical behavior of the probe 110, and the probe substitute circuit 120 replaces the probe 110 to perform noise detection together with the signal processing circuit 130. Here, the probe substitute circuit 120 is a corresponding circuit established based on the principle of the probe 110, and can substitute the function of the probe 110 in the orthogonal fundamental mode fluxgate sensor, and meanwhile, since the noise of the probe substitute circuit 120 itself is much lower than that of the probe 110, when the probe substitute circuit 120 is matched with the signal processing circuit 130 for noise detection, the noise generated by the probe substitute circuit 120 can be directly ignored.
On the basis of the probe 110 and the signal processing circuit 130 included in the orthogonal fundamental mode fluxgate sensor itself, the probe substitute circuit 120 is additionally provided, so that the noise separation detection of the probe 110 and the signal processing circuit 130 can be realized.
The noise detection is performed based on the probe 110 and the signal processing circuit 130 included in the orthogonal fundamental mode fluxgate sensor itself, and the obtained noise is the total sensor noise. Here, the total sensor noise is noise that is not separated, and includes two components, i.e., noise generated by the probe 110 itself and noise generated by the signal processing circuit 130 itself.
The probe substitution circuit 120 and the orthogonal fundamental mode fluxgate sensor themselves include the signal processing circuit 130 to detect noise, and the obtained noise is the noise of the signal processing circuit 130. Here, the signal processing circuit 130 noise is used to characterize the noise generated by the signal processing circuit 130 itself. The noise obtained by performing the noise detection should include both the noise generated by the probe substitution circuit 120 itself and the noise generated by the signal processing circuit 130 itself, but since the noise generated by the probe substitution circuit 120 itself is extremely small compared to the noise generated by the probe 110 itself, and is negligible in the noise obtained by performing the noise detection by the probe substitution circuit 120 and the signal processing circuit 130, the noise obtained by performing the noise detection by the probe substitution circuit 120 and the signal processing circuit 130 can be directly used as the noise of the signal processing circuit 130.
Since the total sensor noise includes two parts, i.e., noise generated by the probe 110 and noise generated by the signal processing circuit 130, and the noise generated by the signal processing circuit 130, i.e., noise generated by the signal processing circuit 130, is detected based on the probe substitution circuit 120 and the signal processing circuit 130, the noise generated by the probe 110, i.e., noise generated by the probe 110, can be obtained by subtracting the noise generated by the signal processing circuit 130 from the total sensor noise, thereby realizing noise separation detection of the probe 110 and the signal processing circuit 130.
According to the device provided by the embodiment of the invention, the probe substitution circuit is arranged to be matched with the signal processing circuit for noise detection, the self noise of the signal processing circuit is obtained, the self noise of the probe is further obtained based on the total noise of the sensor, the noise separation detection of the probe and the signal processing circuit is realized, data support is provided for realizing targeted noise optimization design of the sensor, and the noise optimization design effect of the sensor is improved.
Based on the above embodiment, in the apparatus, the probe comprises an amorphous wire and a pickup coil; the amorphous wire is used for modulating a magnetic field to be measured; the pickup coil is used for outputting probe output obtained by modulating the difference between the magnetic field to be detected and the feedback magnetic field and the excitation current.
In particular, amorphous filaments are made of amorphous materials, also known as amorphous or glassy materials, which are rigid solids with high hardness and high viscosity coefficients comparable to crystalline materials. The pick-up coil is wound on the amorphous wire.
When the orthogonal fundamental mode fluxgate sensor works in a closed loop state, the excitation current generated by the signal processing circuit directly excites the amorphous wire, and the amorphous wire modulates the magnetic field to be measured under the action of the excitation current. Here, the magnetic field to be measured is the magnetic field that needs to be measured. The pick-up coil generates a feedback magnetic field under the action of feedback voltage generated by the signal processing circuit, the residual error between the feedback magnetic field and the magnetic field to be measured is modulated by the excitation current, and the pick-up coil outputs the modulated probe output. The output of the probe is a voltage signal, and the output of the probe is related to the residual error obtained by the difference between the magnetic field to be detected and the feedback magnetic field and the excitation current.
Based on any of the above embodiments, fig. 2 is a schematic diagram of a probe replacement circuit according to an embodiment of the present invention, as shown in fig. 2, in the apparatus, the probe replacement circuit includes an adder and a multiplier, and an output terminal of the adder is connected to an input terminal of the multiplier; the adder is used for making a difference between the magnetic field to be measured and the feedback magnetic field to obtain a magnetic field difference value; the multiplier is used for multiplying the magnetic field difference value and the excitation current to obtain the simulation output of the probe.
Specifically, referring to fig. 2, the left side of the arrow is a probe structure, in which one end of the amorphous wire 111 is grounded, and the other end is connected to an excitation circuit in the signal processing circuit, and receives an excitation current I generated by the excitation circuitexc(ii) a A pick-up coil 112 wound on the outer wall of the amorphous wire 111 and connected to a preamplifier in the signal processing circuit, wherein the output of the pick-up coil 112 is a probe output Vcoil(ii) a In addition, a feedback voltage V generated by a feedback circuit in the signal processing circuitFActing on the pick-up coil 112. Amorphous wire 111 at excitation current IexcUnder the excitation of (2), an axial magnetic field is generated, and a magnetic field B to be measured is generatedxBased on the electromagnetic induction principle, the pick-up coil 112 outputs and measures the magnetic field BxThe associated voltage output. In addition, under the condition of closed loop, a feedback magnetic field BFCounteracting the magnetic field B to be measuredxResidual modulated axial magnetic field, probe output V from pick-up coil 112coilAnd Bx-BFAnd (4) correlating.
According to the working principle of the probe, a probe alternative circuit schematic diagram on the right side of the arrow of fig. 2 is constructed. Feedback voltage VFConversion into a feedback magnetic field BFThen, the magnetic field B to be measuredxAre input into an adder together, and the adder is used for measuring the magnetic field BxAnd a feedback magnetic field BFMaking difference to obtain magnetic field difference value BEAnd the difference value B of the magnetic fieldsEInput to the multiplier. In addition, the other input terminal of the multiplier receives the excitation current I generated by the signal processing circuitexcAnd the difference value B of the magnetic fieldsEAnd an excitation current IexcMultiplying the two by the probe simulation output Vcoil。
Based on any of the above embodiments, fig. 3 is a schematic structural diagram of a probe replacement circuit provided in an embodiment of the present invention, and as shown in fig. 3, in the apparatus, an adder 121 and a multiplier 122 in the probe replacement circuit are both constructed based on an operational amplifier.
Specifically, the operational amplifier is a circuit unit having a high amplification factor. In practical circuits, an operational amplifier and a feedback network are combined together to form a functional module. The operational amplifier is an amplifier with special coupling circuit and feedback, and its output signal can be the result of mathematical operations of adding, subtracting or differentiating, integrating, etc. the input signal. In the embodiment of the present invention, the adder 121 and the multiplier 122 are constructed based on an operational amplifier, so that the self-noise of the probe substitute circuit constructed by the adder 121 and the multiplier 122 in the operating state is much smaller than the self-noise of the probe, so that the self-noise of the signal processing circuit in the closed loop state is obtained based on the detection of the probe substitute circuit and the signal processing circuit.
Based on any of the above embodiments, fig. 4 is a schematic structural diagram of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention, as shown in fig. 4, in the apparatus, a signal processing circuit includes a clock generating circuit 131, an excitation circuit 132, a preamplifier 133, a band pass filter 134, a phase sensitive detector 135, an integrator 136, a low pass filter 137, and a feedback circuit 138; wherein, the output end of the clock generating circuit 131 is respectively connected with the exciting circuit 132 and the phase sensitive detector 135; the preamplifier 133, the band-pass filter 134, the phase sensitive detector 135, the integrator 136, and the low-pass filter 137 are connected in sequence, and the output end of the integrator 136 is further connected to the input end of the feedback circuit 138.
The clock generating circuit 131 is used for generating a reference clock signal, and the exciting circuit 132 is used for generating an exciting current based on the reference clock signal and acting the exciting current on the probe or the probe substitute circuit; the feedback circuit 138 is used to generate a feedback voltage and to apply the feedback voltage to the probe or probe replacement circuit.
The probe or probe replacement circuit senses the magnetic field to be measured and generates a probe output or a probe simulation output, the probe output or the probe simulation output is picked up by the preamplifier 133 and then input to the phase sensitive detector 135 through the band-pass filter 134, the phase sensitive detector 135 demodulates the probe output or the probe simulation output under the driving of the reference clock signal, and the demodulated probe output or the demodulated probe simulation output is outputThe probe simulation output is input to an integrator 136 for integration, a feedback voltage is generated by a feedback circuit 138 and acts on the probe or a probe substitute circuit, and the feedback voltage is filtered by a low-pass filter 137 and then serves as a sensor output voltage VoutAnd (6) outputting.
Based on any of the above embodiments, fig. 5 is a schematic flow chart of a method for detecting noise of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention, as shown in fig. 5, the method includes:
noise detection is performed based on the probe and signal processing circuitry to evaluate the total sensor noise, step 510.
Specifically, noise detection is performed based on a probe and a signal processing circuit included in the orthogonal fundamental mode fluxgate sensor itself, and the obtained noise is the total sensor noise. Here, the total sensor noise is noise that is not separated, and includes two components, i.e., noise generated by the probe itself and noise generated by the signal processing circuit itself.
And step 520, carrying out noise detection based on the probe replacing circuit and the signal processing circuit, and evaluating the self-noise of the signal processing circuit.
Specifically, the fluxgate sensor includes a signal processing circuit for performing noise detection based on the probe substitute circuit and the orthogonal fundamental mode fluxgate sensor itself, and the obtained noise is the self-noise of the signal processing circuit. Here, the signal processing circuit self-noise is used to characterize the noise generated by the signal processing circuit itself. The noise obtained by performing the noise detection should include two parts, i.e., noise generated by the probe substitution circuit itself and noise generated by the signal processing circuit itself, but since the noise generated by the probe substitution circuit itself is extremely small compared to the noise generated by the probe itself and is negligible in the noise obtained by performing the noise detection by the probe substitution circuit and the signal processing circuit, the noise obtained by performing the noise detection by the probe substitution circuit and the signal processing circuit can be directly used as the self-noise of the signal processing circuit.
It should be noted that, in the embodiment of the present invention, the execution sequence of step 510 and step 520 is not specifically limited, step 510 may be executed before step 520, or may be executed after step 520, and step 510 and step 520 are both executed when the orthogonal fundamental mode fluxgate sensor is in the closed loop state.
At step 530, the probe self-noise is evaluated based on the total sensor noise and the signal processing circuit self-noise.
Specifically, the total noise of the sensor includes two parts, namely noise generated by the probe and noise generated by the signal processing circuit, and the noise generated by the signal processing circuit, namely the self-noise of the signal processing circuit, is detected based on the probe substitution circuit and the signal processing circuit.
According to the method provided by the embodiment of the invention, the probe substitution circuit is arranged to be matched with the signal processing circuit for noise detection, the self noise of the signal processing circuit is obtained, and then the self noise of the probe is obtained based on the total noise of the sensor, so that the noise separation detection of the probe and the signal processing circuit is realized, data support is provided for realizing targeted noise optimization design of the sensor, and the noise optimization design effect of the sensor is improved.
Based on any of the above embodiments, the method further includes, before step 520: the feedback voltage output by the signal processing circuit is converted into a feedback magnetic field and is input to an adder in the probe substitution circuit; the excitation current output by the signal processing circuit is input to a multiplier in the probe replacement circuit.
In particular, it may also be desirable to connect the probe replacement circuitry to the signal processing circuitry before performing step 520. Furthermore, feedback voltage generated by a feedback circuit in the signal processing circuit needs to be converted into a feedback magnetic field and then is input to an adder in the probe substitution circuit, so that the adder can make a difference between the feedback magnetic field and a magnetic field to be detected to obtain a magnetic field difference value; in addition, the exciting current generated by the exciting circuit in the signal processing circuit needs to be input to a multiplier in the probe replacing circuit, so that the product of the exciting current and the magnetic field difference value is obtained by the multiplier as the probe simulation output.
Based on any of the above embodiments, fig. 6 is a schematic structural diagram of a noise detection system of an orthogonal fundamental mode fluxgate sensor according to an embodiment of the present invention, as shown in fig. 6, the system includes a total sensor noise detection unit 610, a signal processing circuit self-noise detection unit 620, and a probe self-noise detection unit 630;
the sensor total noise detection unit 610 is configured to perform noise detection based on the probe and the signal processing circuit, and evaluate the sensor total noise;
the signal processing circuit self-noise detection unit 620 is used for carrying out noise detection based on the probe replacing circuit and the signal processing circuit and evaluating the self-noise of the signal processing circuit;
the probe self-noise detection unit 630 evaluates probe self-noise based on the sensor total noise and the signal processing circuit self-noise.
According to the system provided by the embodiment of the invention, the probe substitution circuit is arranged to be matched with the signal processing circuit for noise detection, the self noise of the signal processing circuit is obtained, and then the self noise of the probe is obtained based on the total noise of the sensor, so that the noise separation detection of the probe and the signal processing circuit is realized, data support is provided for realizing targeted noise optimization design of the sensor, and the noise optimization design effect of the sensor is improved.
According to any of the above embodiments, the system further includes a connection unit;
the connecting unit is used for converting the feedback voltage output by the signal processing circuit into a feedback magnetic field and inputting the feedback magnetic field to an adder in the probe replacing circuit; and inputting the excitation current output by the signal processing circuit to a multiplier in the probe replacing circuit.
Fig. 7 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device may include: a processor (processor)701, a communication Interface (Communications Interface)702, a memory (memory)703 and a communication bus 704, wherein the processor 701, the communication Interface 702 and the memory 703 complete communication with each other through the communication bus 704. The processor 701 may call a computer program stored in the memory 703 and executable on the processor 701 to perform the noise detection method based on the orthogonal basis mode fluxgate sensor noise detection apparatus provided in the foregoing embodiments, for example, the method includes: noise detection is carried out based on the probe and the signal processing circuit, and the total noise of the sensor is evaluated; noise detection is carried out on the basis of the probe replacing circuit and the signal processing circuit, and self noise of the signal processing circuit is evaluated; evaluating probe self-noise based on the sensor total noise and the signal processing circuit self-noise.
In addition, the logic instructions in the memory 703 can be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to, when executed by a processor, perform the noise detection method based on the orthogonal fundamental mode fluxgate sensor noise detection apparatus provided in the foregoing embodiments, for example, the method includes: noise detection is carried out based on the probe and the signal processing circuit, and the total noise of the sensor is evaluated; noise detection is carried out on the basis of the probe replacing circuit and the signal processing circuit, and self noise of the signal processing circuit is evaluated; evaluating probe self-noise based on the sensor total noise and the signal processing circuit self-noise.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The noise detection method of the orthogonal fundamental mode fluxgate sensor noise detection device is characterized in that the orthogonal fundamental mode fluxgate sensor noise detection device comprises a probe, a probe substitution circuit and a signal processing circuit, wherein the probe substitution circuit is a response circuit established based on the probe principle; the probe is used for matching with the signal processing circuit to detect noise and evaluate the total noise of the sensor; the total noise of the sensor consists of probe self-noise and signal processing circuit self-noise; the probe substitution circuit is used for being matched with the signal processing circuit to carry out noise detection and evaluating the self noise of the signal processing circuit; the probe replacing circuit comprises an adder and a multiplier, wherein the output end of the adder is connected with the input end of the multiplier; the adder is used for making a difference between the magnetic field to be measured and the feedback magnetic field to obtain a magnetic field difference value; the multiplier is used for multiplying the magnetic field difference value by the excitation current to obtain the simulation output of the probe; the adder and the multiplier are constructed based on an operational amplifier;
the noise detection method comprises the following steps:
noise detection is carried out based on the probe and the signal processing circuit, and the total noise of the sensor is evaluated;
noise detection is carried out on the basis of the probe replacing circuit and the signal processing circuit, and self noise of the signal processing circuit is evaluated;
evaluating probe self-noise based on the sensor total noise and the signal processing circuit self-noise.
2. The method of claim 1, wherein the evaluating signal processing circuit self-noise based on the probe replacement circuit and the signal processing circuit for noise detection further comprises:
the adder is used for converting the feedback voltage output by the signal processing circuit into a feedback magnetic field and inputting the feedback magnetic field into the probe substitution circuit;
and inputting the excitation current output by the signal processing circuit to a multiplier in the probe replacing circuit.
3. A noise detection system of a noise detection device of an orthogonal fundamental mode fluxgate sensor based on the method of claim 1, comprising:
the sensor total noise detection unit is used for carrying out noise detection based on the probe and the signal processing circuit and evaluating the total noise of the sensor;
the signal processing circuit self-noise detection unit is used for carrying out noise detection based on the probe substitution circuit and the signal processing circuit and evaluating the self-noise of the signal processing circuit;
and the probe self-noise detection unit is used for evaluating the probe self-noise based on the total noise of the sensor and the self-noise of the signal processing circuit.
4. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method as claimed in claim 1 or 2 are implemented when the processor executes the program.
5. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to claim 1 or 2.
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