Direct current source based on data fusion of multiple magnetic field sensors

Abstract

The invention provides a direct current source based on multi-magnetic field sensor data fusion, and belongs to the field of direct current source design, and a multi-sensor unit is used for measuring the total field value of environment magnetic induction intensity, the component field value of the environment magnetic induction intensity and the total magnetic induction intensity; the signal fusion processing unit is used for adopting the magnetic induction intensity generated by the environment magnetic induction intensity compensation coil, converting a corresponding current value, feeding back the current value to the constant current source, and adjusting the magnitude of the constant current; the constant current source is used for correcting the magnitude of current according to the current signal fed back by the signal fusion processing unit and outputting constant current; the coil is used for generating a magnetic field under the action of constant current. The high-stability current source based on magnetoelectric conversion feedback detection is provided under the condition that a shielding cylinder is not needed, and the output stability and precision of the current source can be greatly improved.

Description

Technical Field

[0001] The present application belongs to the field of direct current source design, and more specifically, to a direct current source based on multi-magnetic field sensor data fusion. Background Art

[0002] In some basic physical interaction search experiments and some industrial application scenarios, the experimental conditions have high requirements on the stability and noise level of the current source. To a certain extent, the uncertainty of the measurement result is limited by the uncertainty of the current source. The uncertainty of the current source comes from the voltage source and precision resistor used. The noise of the precision current source can be suppressed by converting the current signal into a voltage signal using a low-noise resistor and comparing it with the reference voltage signal. This method of noise suppression is limited in principle by the noise of the precision resistor, such as 1 / f noise, shot noise, etc. This limitation is particularly obvious at larger currents. Therefore, the accuracy of the precision current source is generally 6 to 7 bits, which cannot meet the strict requirements for the stability and noise level of the current source in existing work. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of the present application is to provide a DC current source based on multi-magnetic field sensor data fusion, aiming to solve the problem of insufficient stability of the current current source.

[0004] To achieve the above-mentioned purpose, in a first aspect, the present application provides a DC current source based on multi-magnetic field sensor data fusion, comprising: a constant current source, a coil, a multi-sensor unit and a signal fusion processing unit;

[0005] The constant current source is connected to both ends of the coil; the multi-sensor unit is located inside the coil; the output end of the multi-sensor unit is connected to the input end of the signal fusion processing unit; the output end of the signal fusion processing unit is connected to the constant current source;

[0006] The constant current source is used to correct the current size according to the current signal fed back by the signal fusion processing unit and output a constant current;

[0007] The coil is used to generate a magnetic field under the action of a constant current;

[0008] The multi-sensor unit is used to measure the total field value of the environmental magnetic induction intensity, the component field values ​​of the environmental magnetic induction intensity and the overall magnetic induction intensity; wherein the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current and the environmental magnetic induction intensity; the signal fusion processing unit is used to use the environmental magnetic induction intensity to compensate the magnetic induction intensity generated by the coil, convert it into a corresponding current value and feed it back to the constant current source to adjust the size of the constant current.

[0009] Further preferably, the multi-sensor unit comprises: an OVH sensor, an optically pumped magnetometer, and at least one of a magnetoresistive sensor and a fluxgate sensor;

[0010] The OVH sensor is used to measure the total field value of the ambient magnetic induction intensity; at least one of the fluxgate and the magnetoresistive sensor is used to measure the component field value of the ambient magnetic induction intensity;

[0011] The optically pumped magnetometer is used to measure the overall magnetic induction intensity, where the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current and the ambient magnetic induction intensity;

[0012] The signal fusion processing unit is used to fuse the ambient magnetic induction intensity measured by the OVH sensor, magnetoresistive sensor and fluxgate sensor to obtain the fused ambient magnetic induction intensity, compensate it to the overall magnetic induction intensity obtained by the optical pump magnetometer, obtain the magnetic induction intensity generated by the constant current in the coil, convert it into the corresponding current value and feed it back to the constant current source.

[0013] In a second aspect, the present application provides a method for implementing a DC current source based on multi-magnetic field sensor data fusion, comprising the following steps:

[0014] At the kth moment, the output current of the constant current source is corrected according to the current signal fed back by the signal fusion processing unit, and a constant current is output;

[0015] The coil generates a magnetic field under the action of a constant current;

[0016] The total field value of the environmental magnetic induction intensity at time k, the component field values ​​of the environmental magnetic induction intensity and the overall magnetic induction intensity are measured, and the total field value of the environmental magnetic induction intensity and the component field values ​​of the environmental magnetic induction intensity are integrated; wherein the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current in the coil and the environmental magnetic induction intensity;

[0017] The fused environmental magnetic induction intensity is used to compensate the overall magnetic induction intensity, the magnetic induction intensity generated by the constant current in the coil is obtained, the corresponding current signal is converted and fed back to the constant current source, and the magnitude of the constant current at the k+1th moment is adjusted.

[0018] Further preferably, an OVH sensor is used to measure the total magnetic field of the ambient magnetic induction intensity, and at least one of a fluxgate and a magnetoresistive sensor is used to measure the component field value of the ambient magnetic induction intensity;

[0019] The total magnetic field of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity are fused, and the total magnetic induction intensity is subtracted from the fused ambient magnetic induction intensity to obtain the magnetic induction intensity generated by the constant current in the coil.

[0020] Further preferably, when the stability of the total field value of the ambient magnetic induction intensity measured by the OVH sensor exceeds a preset stability, the sampling rate of the mixed field is increased to obtain component field values ​​of the ambient magnetic induction intensity with higher accuracy.

[0021] Further preferably, when the magnetic field stability does not exceed the preset stability, and the confidence of the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity is higher than the preset confidence, the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity are directly fused; when the confidence of the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity is not higher than the preset confidence, the fused ambient magnetic induction intensity is obtained based on the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity using a mutual correction method.

[0022] Further preferably, the mutual correction method is specifically as follows: through the synchronous collection of the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity, using the mutual correction compensation of the total field value of the ambient magnetic induction intensity and the component field of the ambient magnetic induction intensity, the parameters in the OVH sensor, flux gate and magnetoresistive sensor are corrected and calibrated, and then the data is re-collected for fusion.

[0023] Further preferably, the parameters in the OVH sensor, fluxgate and magnetoresistive sensor include: bias voltage and temperature drift.

[0024] In general, the above technical solutions conceived by this application have the following beneficial effects compared with the prior art:

[0025] The present application provides a DC current source based on multi-magnetic field sensor data fusion, adopts OVH sensor to measure the total field value of environmental magnetic induction intensity, adopts fluxgate and / or magnetoresistive sensor to measure component field value of environmental magnetic induction intensity, and by adopting multi-sensor fusion technology, the fused environmental magnetic induction intensity can be obtained to compensate for the overall magnetic induction intensity, shield the earth's magnetic field and external interference magnetic field, and obtain the magnetic induction intensity generated by constant current in the coil. In the absence of a shielding tube, a high-stability current source based on magneto-electric conversion feedback detection is provided, which can greatly improve the output stability and accuracy of the current source. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a design structure diagram of a high-stability direct current source based on multi-magnetic field sensor data fusion provided in an embodiment of the present application;

[0027] Figure 2 It is a structural diagram of the signal fusion processing unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0030] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0031] The technical solutions provided in the embodiments of the present application are introduced.

[0032] This application is based on solving the problem of insufficient stability of current sources, and proposes a high-stability DC current source based on multi-magnetic field sensor data fusion, and improves the output stability and accuracy of the current source based on multi-magnetic field sensor data fusion and magneto-electric conversion feedback detection method.

[0033] Specifically, Figure 1 and Figure 2 The current source shown includes: a constant current source, a coil, a multi-sensor unit and a signal fusion processing unit;

[0034] The constant current source is connected to both ends of the coil, outputs a constant current as required, and corrects the magnitude of the output constant current according to the signal fed back by the signal fusion processing unit;

[0035] The coil is used to generate a magnetic field based on a constant electric current;

[0036] The multi-sensor unit includes: an OVH (Overhauser) sensor, a magnetoresistive sensor, a fluxgate sensor and an optically pumped magnetometer, which are used to measure the total field value of the ambient magnetic induction intensity, the component field values ​​of the ambient magnetic induction intensity and the overall magnetic induction intensity;

[0037] The signal fusion processing unit is used to fuse the magnetic induction intensity measured by the OVH sensor, magnetoresistive sensor and fluxgate sensor to obtain accurate environmental magnetic induction intensity, compensate it to the optical pump magnetometer, calculate the magnetic induction intensity generated by the coil, convert it to the corresponding current value and feed the result back to the constant current source;

[0038] The optically pumped magnetometer is used to accurately measure the magnetic field generated by the constant current output by the constant current source, and feed back to the constant current source to improve the current stability and accuracy of its output;

[0039] Furthermore, the OVH sensor, the magnetoresistive sensor and the fluxgate sensor are used to measure the ambient magnetic induction intensity, which is fed back to the optical pumping magnetometer to offset the ambient magnetic field, so that the optical pumping magnetometer can measure the magnetic field generated by the coil;

[0040] Among them, Figure 2 As shown, the OVH sensor transmits the measured total field value to the signal fusion processing unit, and the fluxgate and magnetoresistive sensors transmit the measured component field values ​​to the signal fusion processing unit. The signal fusion processing unit can obtain higher sensitivity and higher accuracy through the mixed field composed of the total field and the component field.

[0041] More specifically, in a stable magnetic field, since the output signals of the fluxgate sensor and the magnetoresistive sensor are continuous and stable, the sampling rate of the mixed field can be increased to obtain more precise measurement accuracy while ensuring the stability of the OVH sensor signal.

[0042] In an unstable magnetic field, the drastic change of the magnetic field causes the frequency of the Larmor signal to be disturbed. In this environment, the mixed field value obtained by phase locking may not be accurate. Therefore, the confidence level can be obtained by the change of the total field value and the component field value to provide a basis for signal selection. In measurement situations with high confidence, the direct measurement values ​​of the total field and the component field can ensure the acquisition of magnetic field characteristic information; in the case of low confidence, the mutual correction method is used to provide a fusion measurement value with lower accuracy. With the cooperation of various means, combined with the measurement data of the fusion sensor under dynamic feedback, magnetic field measurement in various environments can be realized.

[0043] To summarize, the present application adopts multi-sensor fusion technology to shield the geomagnetic field and external interference magnetic field, and provides a high-stability current source based on magneto-electric conversion feedback detection without the need for a shielding tube, which can greatly improve the output stability and accuracy of the current source.

[0044] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A DC current source based on multi-magnetic field sensor data fusion, It is characterized in that include: Constant current source, coil, multi-sensor unit and signal fusion processing unit; The constant current source is connected to both ends of the coil; the multi-sensor unit is located inside the coil; the output end of the multi-sensor unit is connected to the input end of the signal fusion processing unit; the output end of the signal fusion processing unit is connected to the constant current source; The constant current source is used to correct the magnitude of the output current of the constant current source according to the current signal fed back by the signal fusion processing unit, and output a constant current; The coil is used to generate a magnetic field under the action of a constant current; The multi-sensor unit is used to measure the total field value of the environmental magnetic induction intensity, the component field values ​​of the environmental magnetic induction intensity and the overall magnetic induction intensity; wherein the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current and the environmental magnetic induction intensity; The signal fusion processing unit is used to compensate the overall magnetic induction intensity with the environmental magnetic induction intensity, obtain the magnetic induction intensity generated by the constant current in the coil, convert the corresponding current value and feed it back to the constant current source to adjust the size of the constant current.

2. The direct current source according to claim 1, It is characterized in that The multi-sensor unit includes: an OVH sensor, an optically pumped magnetometer, and at least one of a magnetoresistive sensor and a fluxgate sensor; The OVH sensor is used to measure the total field value of the ambient magnetic induction intensity; at least one of the fluxgate and the magnetoresistive sensor is used to measure the component field value of the ambient magnetic induction intensity; The optically pumped magnetometer is used to measure the overall magnetic induction intensity, where the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current and the ambient magnetic induction intensity; the signal fusion processing unit is used to fuse the ambient magnetic induction intensity measured by the OVH sensor, the magnetoresistive sensor and the fluxgate sensor to obtain the fused ambient magnetic induction intensity, compensate it to the overall magnetic induction intensity obtained by the optically pumped magnetometer, obtain the magnetic induction intensity generated by the constant current in the coil, convert it into a corresponding current value and feed it back to the constant current source.

3. A method for implementing the DC current source according to claim 1, It is characterized in that The following steps are involved: At the kth moment, the output current of the constant current source is corrected according to the current signal fed back by the signal fusion processing unit, and a constant current is output; The coil generates a magnetic field under the action of a constant current; The total magnetic field of the ambient magnetic induction intensity at time k, the component field values ​​of the ambient magnetic induction intensity and the overall magnetic induction intensity are measured, and the total field value of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity are integrated; wherein the overall magnetic induction intensity is the sum of the magnetic induction intensity generated by the constant current in the coil and the ambient magnetic induction intensity; The fused environmental magnetic induction intensity is used to compensate the overall magnetic induction intensity, the magnetic induction intensity generated by the constant current in the coil is obtained, the corresponding current signal is converted and fed back to the constant current source, and the magnitude of the constant current at the k+1th moment is adjusted.

4. The method for realizing the direct current source according to claim 3, It is characterized in that An OVH sensor is used to measure the total magnetic field of the ambient magnetic induction intensity, and at least one of a fluxgate and a magnetoresistive sensor is used to measure the component field value of the ambient magnetic induction intensity; The total magnetic field of the ambient magnetic induction intensity and the component field values ​​of the ambient magnetic induction intensity are fused, and the total magnetic induction intensity is subtracted from the fused ambient magnetic induction intensity to obtain the magnetic induction intensity generated by the constant current in the coil.

5. The method for realizing the direct current source according to claim 3 or 4, It is characterized in that When the stability of the total field value of the ambient magnetic induction intensity measured by the OVH sensor exceeds the preset stability, the sampling rate of the mixed field is increased to obtain the component field values ​​of the ambient magnetic induction intensity with higher accuracy.

6. The method for realizing the direct current source according to claim 4, It is characterized in that When the magnetic field stability does not exceed the preset stability, and the confidence of the total field value of the ambient magnetic induction intensity and the component field value of the ambient magnetic induction intensity is higher than the preset confidence, the total field value of the ambient magnetic induction intensity and the component field value of the ambient magnetic induction intensity are directly fused; when the confidence of the total field value of the ambient magnetic induction intensity and the component field value of the ambient magnetic induction intensity is not higher than the preset confidence, the fused ambient magnetic induction intensity is obtained based on the total field value of the ambient magnetic induction intensity and the component field value of the ambient magnetic induction intensity using the mutual correction method.

7. The method for realizing a direct current source according to claim 6, It is characterized in that The mutual correction method is specifically as follows: through the synchronous collection of the total field value of the ambient magnetic induction intensity and the component field value of the ambient magnetic induction intensity, the mutual correction compensation of the total field value of the ambient magnetic induction intensity and the component field of the ambient magnetic induction intensity is used to correct and calibrate the parameters in the OVH sensor, flux gate and magnetoresistive sensor, and then the data is collected again for fusion.

8. The method for realizing the direct current source according to claim 7, It is characterized in that Parameters in OVH sensors, fluxgate and magnetoresistive sensors include: bias voltage and temperature drift.

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