A DC current source based on multi-magnetic field sensor data fusion

Abstract

The present application provides a DC current source based on multi-magnetic field sensor data fusion, belonging to the field of DC current source design, wherein the multi-sensor unit is 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; the signal fusion processing unit is used to use the magnetic induction intensity generated by the ambient magnetic induction intensity compensation coil to convert the corresponding current value and feed it back to the constant current source to adjust the magnitude of the constant current; the constant current source is used to correct the magnitude of the current 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 the constant current. The present application provides a high-stability current source based on magnetoelectric conversion feedback detection without the need for a shielding tube, which can significantly improve the output stability and accuracy of the current source.

Description

Technical Field

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

[0002] In certain fundamental physics interaction search experiments and some industrial application scenarios, the experimental conditions place high demands on the stability and noise level of the current source. To a certain extent, the uncertainty of the measurement results is limited by the uncertainty of the current source. The uncertainty of the current source originates from the voltage source and precision resistors 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 a reference voltage signal. This noise suppression method is fundamentally limited by the noise of the precision resistor, such as 1 / f noise and shot noise. This limitation is particularly pronounced at higher currents. As a result, the accuracy of precision current sources is generally between 6 and 7 bits, which cannot meet the strict stability and noise requirements of current sources in existing work. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the purpose of this 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 objectives, 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 ambient magnetic induction intensity, the component field values ​​of the ambient 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 ambient magnetic induction intensity; the signal fusion processing unit is used to use the ambient magnetic induction intensity to compensate for the magnetic induction intensity generated by the coil, convert the corresponding current value into feedback to the constant current source, and adjust the magnitude 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 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 optically pumped 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 ambient magnetic induction intensity, the component field values ​​of the ambient magnetic induction intensity, and the overall magnetic induction intensity at time k 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 in the coil by the constant current and the ambient magnetic induction intensity;

[0017] The fused environmental magnetic induction intensity is used to compensate the overall magnetic induction intensity, and 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 to adjust the magnitude of the constant current at the k+1th moment.

[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 values ​​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 difference between the total magnetic induction intensity and the fused ambient magnetic induction intensity is taken 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 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.

[0023] Further preferably, the parameters of 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 existing technologies:

[0025] The present application provides a DC current source based on the fusion of multi-magnetic field sensor data, which uses an OVH sensor to measure the total field value of the ambient magnetic induction intensity, and uses a fluxgate and / or magnetoresistive sensor to measure the component field values ​​of the ambient magnetic induction intensity. By adopting the technology of multi-sensor fusion, the fused ambient magnetic induction intensity can be obtained to compensate for the overall magnetic induction intensity, shield the geomagnetic field and external interference magnetic field, and obtain the magnetic induction intensity generated by a constant current in the coil. Without the need for a shielding tube, a high-stability current source based on magnetoelectric 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 This is a structural diagram of a high-stability DC current source design based on multi-magnetic field sensor data fusion provided in an embodiment of the present application;

[0027] Figure 2 This 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 solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0029] In the embodiments of this 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 this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

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

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

[0032] This application aims to solve the problem of insufficient stability of current sources and proposes a high-stability DC current source based on multi-magnetic field sensor data fusion. The output stability and accuracy of the current source are improved based on multi-magnetic field sensor data fusion and magnetoelectric 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 needed, and adjusts the output constant current based on the signal fed back by the signal fusion processing unit;

[0035] The coil is used to generate a magnetic field based on a constant 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 into 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 the magnetic field to the constant current source to improve the current stability and accuracy of its output.

[0039] Furthermore, the OVH sensor, magnetoresistive sensor, and fluxgate sensor are used to measure the ambient magnetic induction intensity, which is fed back to the optically pumped magnetometer to offset the ambient magnetic field, allowing the optically pumped magnetometer to 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, while ensuring the stability of the OVH sensor signal, the sampling rate of the mixed field can be increased to obtain more accurate measurement accuracy.

[0042] In unstable magnetic fields, drastic fluctuations can cause frequency disturbances in the Larmor signal. In such environments, the mixed field values ​​acquired through phase lock-in are not necessarily accurate. Therefore, deriving confidence levels from the changes in the total and component field values ​​can provide a basis for signal selection. In high-confidence measurement scenarios, direct measurements of the total and component fields ensure the acquisition of magnetic field signature information. In less confident situations, mutual correction methods provide fused measurements with lower accuracy. By combining multiple methods and fusing sensor measurement data with dynamic feedback, magnetic field measurements can be achieved in a variety of environments.

[0043] To sum up, this 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 magnetoelectric 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 is easy for those skilled in the art to understand that the above 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 should 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, 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 ambient magnetic induction intensity, the component field values ​​of the ambient 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 ambient 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 into feedback to the constant current source, and adjust the magnitude of the constant current.

2. The DC current source according to claim 1, wherein: 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 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, 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, and 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 to adjust the magnitude of the constant current at the k+1th moment.

4. The method for implementing a DC current source according to claim 3, wherein: 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 values ​​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 difference between the total magnetic induction intensity and the fused ambient magnetic induction intensity is taken to obtain the magnetic induction intensity generated by the constant current in the coil.

5. The method for realizing a DC current source according to claim 3 or 4, 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 a DC current source according to claim 4, wherein: 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 the mutual correction method.

7. The method for implementing a DC current source according to claim 6, wherein: 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, fluxgate and magnetoresistive sensor, and then the data is collected again for fusion.

8. The method for implementing a DC current source according to claim 7, wherein: Parameters in OVH sensors, fluxgate and magnetoresistive sensors include bias voltage and temperature drift.

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