Multi-sensing-unit mutual correction tracking quantum magnetic measurement method and system for tunnel magnetoresistance and diamond color center, storage medium and electronic equipment

Abstract

The invention discloses a multi-sensing-unit mutual correction tracking quantum magnetic measurement method and system for tunnel magnetoresistance and a diamond color center, a storage medium and electronic equipment. The method comprises the following steps: measuring an absolute magnetic field value of a microwave signal based on an NV color center sensing unit; determining calibration parameters of the TMR sensing unit based on the absolute magnetic field value; the voltage value output by the TMR sensing unit with the determined calibration parameters is converted into a TMR prediction magnetic field, and the TMR prediction microwave frequency is obtained through the TMR prediction magnetic field; calculating an NV measurement magnetic field based on the TMR prediction microwave frequency or the NV prediction frequency calculated by the NV color center sensing unit in the previous period; and calculating a magnetic field tracking signal based on the TMR prediction magnetic field and the NV measurement magnetic field, and taking the magnetic field tracking signal as a final magnetic field intensity value.

Description

Technical Field

[0001] This invention relates to the field of quantum sensing and magnetic measurement technology, and more specifically, to a method, system, storage medium, and electronic device for quantum magnetic measurement involving cross-calibration tracking of multiple sensitive units of tunnel magnetoresistance and diamond color centers. Background Technology

[0002] In the field of high-precision dynamic magnetic field tracking and measurement, the overall performance of the sensor is key to determining its application range. TMR magnetic sensors offer advantages such as high bandwidth and fast response, but their measurement accuracy is severely affected by temperature drift and nonlinear errors, resulting in poor long-term stability and making them unsuitable for high-precision absolute field measurements. NV color center magnetic sensors possess the capabilities of room temperature operation, passive drift, and absolutely accurate measurement; however, their measurement rate is limited by the optical processes of spin state initialization and readout, resulting in a narrow effective bandwidth and making it difficult to independently and accurately track high-frequency dynamic magnetic fields.

[0003] Existing magnetic tracking schemes mostly rely on a single type of sensor, leading to an inherent contradiction between "high precision" and "high speed." Although some research has attempted to fuse data from sensors based on different principles, these methods mostly remain at the back-end data processing level, failing to establish a front-end real-time, closed-loop cross-calibration mechanism between sensors. Specifically, TMR sensors lack an online, reliable benchmark for real-time calibration, making it impossible to fundamentally solve their inherent drift problem; simultaneously, NV color center sensors lack a fast guide signal to optimize their relatively slow measurement loop, thus limiting the overall system's dynamic performance.

[0004] Based on this, this application proposes a multi-sensitive unit mutual calibration tracking quantum magnetic measurement method using tunnel magnetoresistance and diamond color center to solve the above problems. Summary of the Invention

[0005] The present invention provides a quantum magnetic measurement method, system, storage medium, and electronic device for multi-sensitive unit mutual calibration tracking of tunnel magnetoresistance and diamond color center, in order to solve the problem of how to achieve high-precision and high-speed synchronous tracking of dynamic magnetic fields.

[0006] To address the aforementioned problems, this invention provides a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method using tunnel magnetoresistance and diamond color centers, the method comprising:

[0007] The absolute magnetic field value of microwave signals is measured based on the NV color center sensing element;

[0008] The calibration parameters of the TMR sensing element are determined based on the absolute magnetic field value;

[0009] The voltage value output by the TMR sensing unit, whose calibration parameters are determined, is converted into a TMR predicted magnetic field, and the TMR predicted microwave frequency is obtained through the TMR predicted magnetic field.

[0010] The NV measurement magnetic field is calculated based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the previous period of the NV color center sensitive unit.

[0011] Based on the TMR predicted magnetic field and the NV measured magnetic field, the magnetic field tracking signal is calculated, and the magnetic field tracking signal is used as the final magnetic field strength value.

[0012] Preferably, the method further includes:

[0013] The TMR output error value is calculated based on the final magnetic field strength value, and the calibration parameters of the TMR sensing unit are adjusted based on the TMR output error value.

[0014] Preferably, the measurement of the absolute magnetic field value of the microwave signal based on the NV color center sensing element includes:

[0015] The formula for calculating the absolute magnetic field value of microwave signals based on NV color center sensing elements is as follows:

[0016]

[0017] Among them, f A f B The points A and B on the measurement demodulation curve of the NV color center sensitive unit correspond to the microwave frequencies of the characteristic extrema. These are fundamental physical constants.

[0018] Preferably, the calibration parameters of the TMR sensing unit are determined based on the absolute magnetic field value, and the parameter model used for the calibration parameters is:

[0019] B NV =K×V TMR +B0#(2)

[0020] Among them, B NV The absolute magnetic field value, V, is measured by the NV color center sensing unit. TMR Let B be the real-time output voltage of the TMR sensing element, K be the scale coefficient, and B0 be the zero-point offset of the TMR sensing element. Substituting B... NV and V TMR Initialize and solve for the scale coefficient K and zero offset B0.

[0021] Preferably, the step of converting the voltage value output by the TMR sensing unit, which determines the calibration parameters, into a TMR predicted magnetic field, and obtaining the TMR predicted microwave frequency through the TMR predicted magnetic field, includes:

[0022] Based on a preset sampling rate, the voltage value output by the TMR sensing unit is sampled at high speed, and the voltage value is converted into a TMR predicted magnetic field through the parameter model.

[0023] Preferably, the calculation of the NV measurement magnetic field based on the TMR predicted microwave frequency and the NV predicted frequency calculated by the previous period of the NV color center sensing unit includes:

[0024]

[0025] Among them, B NVC For NV to measure the magnetic field, f A and f B σ is the microwave frequency predicted by TMR or the NV predicted frequency calculated in the previous period of the NV color center sensitive unit. A and σ B k is the demodulation error value. A and k B This is based on the slope of the adaptive demodulation curve.

[0026] Preferably, the step of calculating the TMR output error value based on the final magnetic field strength value, and adjusting the calibration parameters of the TMR sensing unit based on the TMR output error value, includes:

[0027] The TMR output error value σ is calculated using the following formula. TMR :

[0028] σ TMR =B output (t)-(K×V TMR +B0)#(4)

[0029] Among them, B output (t) represents the final magnetic field strength value, V TMR is the real-time output voltage of the TMR sensing element, K is the scale coefficient, and B0 is the zero-point offset of the TMR sensing element.

[0030] Based on another aspect of the present invention, the present invention provides a multi-sensitive unit cross-calibration tracking quantum magnetic measurement system for tunnel magnetoresistance and diamond color centers, characterized in that the system comprises:

[0031] Measurement unit, used to measure the absolute magnetic field value of microwave signals based on NV color center sensing unit;

[0032] A calibration unit is used to determine the calibration parameters of the TMR sensing unit based on the absolute magnetic field value;

[0033] The acquisition unit is used to convert the voltage value output by the TMR sensing unit with determined calibration parameters into a TMR predicted magnetic field, and to obtain the TMR predicted microwave frequency through the TMR predicted magnetic field.

[0034] The calculation unit is used to calculate the NV measurement magnetic field based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the previous period of the NV color center sensing unit; and to calculate the magnetic field tracking signal based on the TMR predicted magnetic field and the NV measurement magnetic field, and to use the magnetic field tracking signal as the final magnetic field strength value.

[0035] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements steps such as a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method for tunnel magnetoresistance and diamond color centers.

[0036] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0037] The aforementioned computer-readable storage medium; and

[0038] One or more processors for executing a program in the computer-readable storage medium.

[0039] This invention provides a method, system, storage medium, and electronic device for multi-sensor unit mutual calibration and tracking quantum magnetic measurement using tunnel magnetoresistive (TMR) and diamond nitrogen-vacancy (NV) centers. The method includes: measuring the absolute magnetic field value of a microwave signal based on an NV center sensitive unit; determining calibration parameters for a TMR sensitive unit based on the absolute magnetic field value; converting the voltage value output by the TMR sensitive unit with the determined calibration parameters into a TMR predicted magnetic field, and obtaining the TMR predicted microwave frequency using the TMR predicted magnetic field; calculating the NV measured magnetic field based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the NV center sensitive unit in the previous period; calculating the magnetic field tracking signal based on the TMR predicted magnetic field and the NV measured magnetic field, and using the magnetic field tracking signal as the final magnetic field strength value. This invention proposes a multi-sensor unit mutual calibration and tracking quantum magnetic measurement technology using tunnel magnetoresistive (TMR) and diamond nitrogen-vacancy (NV) centers. It utilizes the absolute accuracy provided by the NV center unit to perform real-time online calibration of the TMR unit, while simultaneously using the fast response of the TMR unit to guide the tracking loop of the NV center unit, achieving high-speed and high-precision tracking measurement of the dynamic magnetic field. Attached Figure Description

[0040] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0041] Figure 1This is a flowchart of a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method for tunneling magnetoresistance and diamond color centers according to a preferred embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram illustrating the detection results of ODMR spectral lines and demodulated spectral lines in diamond NV color center magnetic field measurement according to a preferred embodiment of the present invention; and

[0043] Figure 3 This is a flowchart of a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method for tunnel magnetoresistance and diamond color centers according to a preferred embodiment of the present invention.

[0044] Figure 4 This is a structural diagram of a multi-sensitive unit cross-calibration tracking quantum magnetic measurement system for tunneling magnetoresistance and diamond color centers according to a preferred embodiment of the present invention. Detailed Implementation

[0045] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0046] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0047] Figure 1 This is a flowchart of a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method for tunneling magnetoresistance and diamond color centers according to a preferred embodiment of the present invention.

[0048] To achieve high-precision and high-speed synchronous tracking of dynamic magnetic fields and to solve the problems that current single sensors cannot simultaneously achieve absolute accuracy and fast response, as well as the lack of real-time closed-loop mutual calibration in traditional multi-sensor fusion, this invention proposes a quantum magnetic measurement method with multi-sensitive unit mutual calibration of tunnel magnetoresistance and diamond color center.

[0049] like Figure 1 As shown, this invention provides a quantum magnetic measurement method for cross-calibration tracking of multiple sensitive units using tunneling magnetoresistance and diamond color centers, the method comprising:

[0050] Step 101: Measure the absolute magnetic field value of the microwave signal based on the NV color center sensing element;

[0051] Preferably, the measurement of the absolute magnetic field value of the microwave signal based on the NV color center sensing element includes:

[0052] The formula for calculating the absolute magnetic field value of microwave signals based on NV color center sensing elements is as follows:

[0053]

[0054] Among them, f A f B The points A and B on the measurement demodulation curve of the NV color center sensitive unit correspond to the microwave frequencies of the characteristic extrema. These are fundamental physical constants.

[0055] In step 101 of this invention, the NV center magnetic measurement is initialized. The absolute magnetic field value is measured using the NV center sensitive unit. This can be achieved using methods such as continuous wave optical detection magnetic resonance (ODMR) or pulsed light detection magnetic resonance (PLMR), through scanning and fitting techniques. Taking ODMR as an example, a modulated microwave signal is radiated onto the diamond NV center, causing changes in the energy levels and spin states of free electrons within the diamond. These changes are directly related to the magnetic field being measured. A continuous 532nm excitation light excites the color center to emit red fluorescence, which is correlated with the proportion of spin state distribution. A typical curve is shown below. Figure 2 As shown in (a), after the photodetector converts the signal into an electrical signal and filters it, it undergoes demodulation processing in a lock-in amplifier based on the modulation signal. The demodulation produces a typical curve as shown in (a). Figure 2 As shown in (b), the NV colorimetric magnetocardiogram value B is calculated using the microwave frequencies corresponding to points A and B. NV R NV It can be written as:

[0056]

[0057] Where f A f B Points A and B correspond to microwave frequencies. These are all fundamental physical constants, with a value of 28 GHz / T.

[0058] Step 102: Determine the calibration parameters of the TMR sensing element based on the absolute magnetic field value;

[0059] Preferably, the calibration parameters of the TMR sensing element are determined based on the absolute magnetic field value, and the parameter model used for the calibration parameters is as follows:

[0060] B NV =K×V TMR +B0#(2)

[0061] Among them, B NVIt is the absolute magnetic field value measured by the NV color center sensing unit, V TMR Let B be the real-time output voltage of the TMR sensing element, K be the scale coefficient, and B0 be the zero-point offset of the TMR sensing element. Substituting B... NV and V TMR Initialize and solve for the scale coefficient K and zero offset B0.

[0062] In step 102 of this invention, the TMR magnetic measurement is initialized, and the calibration parameters of the TMR sensing element are calculated. The following model can be used for online parameter identification:

[0063] B NV =K×V TMR +B0#(2)

[0064] Among them B NV It is the true value of the absolute magnetic field measured by the NV color center sensing unit, V TMR Let B be the real-time output voltage of the TMR sensing element, K be the scale coefficient, and B0 be the zero-point offset of the TMR sensing element. Substituting B... NV and V TMR Initialize and solve for the sizes of K and B0.

[0065] Step 103: Convert the voltage value output by the TMR sensing unit with determined calibration parameters into the TMR predicted magnetic field, and obtain the TMR predicted microwave frequency through the TMR predicted magnetic field;

[0066] Preferably, the voltage value output by the TMR sensing unit with determined calibration parameters is converted into a TMR predicted magnetic field, and the TMR predicted microwave frequency is obtained through the TMR predicted magnetic field, including:

[0067] Based on the preset sampling rate, the voltage value output by the TMR sensitive unit is sampled at high speed, and the voltage value is converted into the TMR predicted magnetic field through the parameter model.

[0068] In step 103 of this invention, the TMR magnetic measurement sampling is performed. A high-speed analog-to-digital converter (ADC) is used to sample the output voltage of the TMR sensing unit. The sampling rate can be 100kHz, 1MHz, or 10MHz. An effective value within the specified range is obtained through adaptive filtering, and the TMR output V is then processed. TMR The predicted magnetic field B is converted using formula (2). pred B pred The control loop, which feeds back to the NV color center sensing unit, is used to preset its microwave frequency f. A1 and f B1 .

[0069] Step 104: Calculate the NV measurement magnetic field based on the TMR-predicted microwave frequency or the NV-predicted frequency calculated from the previous period of the NV color center sensitive element;

[0070] Preferably, the NV measurement magnetic field is calculated based on the TMR-predicted microwave frequency and the NV-predicted frequency calculated from the previous period of the NV color center sensing element, including:

[0071]

[0072] Among them, B NVC For NV to measure the magnetic field, f A and f B σ is the predicted NV frequency calculated for the preceding period of the TMR-predicted microwave frequency or the NV color center sensitive element. A and σ B k is the demodulation error value. A and k B This is based on the slope of the adaptive demodulation curve.

[0073] In step 104 of this invention, NV color core magnetometry sampling is performed, and the microwave frequency is sequentially set to f. A2 and f B2 f A2 and f B2 It can be set to f A and f B or f A0 and f B0 f A0 and f B0 This is the predicted value calculated based on the previous period's NV color magnetocardiogram measurement. The demodulation error value σ is then obtained. A and σ B And based on the slope k of the adaptive demodulation curve A and k B2 The NV color cardiometastatic measurement value B was calculated. NV B NV It can be written as:

[0074]

[0075] Step 105: Based on the TMR predicted magnetic field and the NV measured magnetic field, calculate the magnetic field tracking signal and use the magnetic field tracking signal as the final magnetic field strength value.

[0076] In step 105 of this invention, the magnetic field is calculated comprehensively based on an adaptive algorithm and B. NV B pred Comprehensive calculation of high-precision, high-response bandwidth magnetic field tracking signal B output (t).

[0077] This invention outputs a magnetic field, which tracks the magnetic field signal B. output (t) is the final signal, which is output to an external display device, such as a server or a computer.

[0078] Preferably, the TMR output error value is calculated based on the final magnetic field strength value, and the calibration parameters of the TMR sensing element are adjusted based on the TMR output error value, including:

[0079] The TMR output error value σ is calculated using the following formula. TMR :

[0080] σ TMR =B output (t)-(K×V TMR +B0)#(4)

[0081] Among them, B output (t) represents the final magnetic field strength value, V TMR is the real-time output voltage of the TMR sensing element, K is the scale coefficient, and B0 is the zero-point offset of the TMR sensing element.

[0082] Preferably, the method further includes:

[0083] The TMR output error value is calculated based on the final magnetic field strength value, and the calibration parameters of the TMR sensitive unit are adjusted based on the TMR output error value.

[0084] This invention calibrates the TMR, and transfers the magnetic field tracking signal B... output (t) is used as the true value of the magnetic field to calculate the TMR output error value σ. TMR , σ TMR It can be written as:

[0085] σ TMR =B output (t)-(K×V TMR +B0)#(4)

[0086] σ TMR As input settings, two PID feedback algorithms are input simultaneously. The two PID algorithms use different PID parameters and different PID feedback speeds. B0 uses fast feedback and K uses slow feedback.

[0087] This invention addresses the technical problems existing in the prior art by proposing a multi-sensitive unit mutual calibration tracking quantum magnetic measurement method using tunnel magnetoresistance and diamond color centers.

[0088] This invention discloses a multi-sensor cell mutual calibration tracking quantum magnetic measurement scheme using tunneling magnetoresistance (TMR) and diamond color centers (NV centers). The scheme includes measuring the absolute magnetic field value using NV center sensing cells, calibrating the TMR sensing cells in real time using this absolute magnetic field value, and using the fast response output of the TMR sensing cells to guide and accelerate the tracking process of the NV center sensing cells. The basic principles of the mutual calibration tracking quantum magnetic measurement scheme are detailed in [link to relevant documentation]. Figure 3 .

[0089] like Figure 3 As shown, this invention provides a quantum magnetic measurement method for multi-sensor unit mutual calibration tracking of tunneling magnetoresistance and diamond color centers, comprising seven steps, wherein steps three to seven are repeated in real time during continuous measurement. The first step is to initialize the NV color center magnetic measurement, using the NV color center sensing unit to measure the absolute magnetic field value B. NV The second step is to initialize the TMR magnetic measurement, based on B. NV and V TMR The initialization process yields K and B0; the third step involves TMR magnetic measurement sampling, with the magnetic field B predicted based on the high-frequency sampling output. pred And the corresponding NV color center microwave frequency f A1 and f B1 The fourth step involves NV colorimetric magnetocardiography sampling. Based on an algorithm, the TMR prediction frequency and the NV measurement pre-period value prediction frequency are intelligently selected. The fluorescence signal is sampled and demodulated to obtain the B... NV The fifth step involves comprehensively calculating the magnetic field, based on an adaptive algorithm and B... NV B pred Comprehensive calculation of high-precision, high-response bandwidth magnetic field tracking signal B output (t); Step 6, output the magnetic field and send the magnetic field tracking signal B. output (t) is output as the final signal to an external display device; the seventh step is to calibrate the TMR and output the magnetic field tracking signal B. output (t) represents the true value of the magnetic field, based on the TMR measurement error value σ. TMR Input the PID feedback algorithm, simultaneously feeding back B0 and K, calibrate the TMR and carry it into the next sampling period.

[0090] This invention relates to the field of quantum sensing and magnetic measurement technology, and more specifically, to a multi-sensor mutual calibration tracking quantum magnetic measurement method using tunnel magnetoresistance (NV) and diamond color centers (DMCs). This method achieves high-precision and high-speed tracking of dynamic magnetic fields through a real-time mutual calibration mechanism between the two. The invention provides a multi-sensor mutual calibration tracking quantum magnetic measurement method, including measuring the absolute magnetic field value using an NV color center (NV) sensitive unit, calibrating the TMR (Transient Dynamic Range) sensitive unit in real time using this absolute magnetic field value, and using the fast response output of the TMR sensitive unit to guide and accelerate the tracking process of the NV color center (NV) sensitive unit. In the entire magnetic tracking technology described above, the online calibration of the TMR using the drift-free reference provided by the NV color center fundamentally eliminates the influence of temperature drift and nonlinearity. Simultaneously, the high bandwidth characteristics of the TMR are used to feedforward guide the measurement loop of the NV, effectively overcoming its inherent bandwidth limitations. This method not only solves the inherent problem of the performance limitations of a single sensor, but also achieves a system performance improvement of "1+1 is much greater than 2" through deep closed-loop mutual calibration, making it possible to achieve wideband, high-precision dynamic magnetic field tracking under conventional experimental conditions.

[0091] This invention provides a quantum magnetic measurement method for cross-calibration tracking of multiple sensitive units using tunneling magnetoresistance and diamond color centers, comprising:

[0092] 1. Real-time mutual calibration mechanism: The absolute accuracy of the NV color center sensing unit is used to perform online parameter calibration of the TMR sensing unit, namely the identification and updating method of K and B0.

[0093] 2. Feedforward guidance mechanism: Utilizing the high bandwidth output of the TMR sensing unit to guide and optimize the specific implementation of the relatively slow measurement and control loop of the NV color center sensing unit.

[0094] 3. Adaptive operating mode: The system can dynamically adjust the sampling rate of the NV sensitive unit and the TMR sensitive unit, as well as the guidance strategy of the TMR sensitive unit for the NV sensitive unit, according to the intensity of the magnetic field change.

[0095] The specific carrier form of the NV color center sensitive unit includes, but is not limited to, bulk diamond, diamond film or nanodiamond particles.

[0096] The overall process of the method is a complete technical solution from magnetic field reference value measurement, real-time calibration, rapid tracking to feedforward guidance.

[0097] This invention is applicable to the field of high-precision dynamic magnetic field tracking measurement. It overcomes the limitations of traditional single-sensor technology, which cannot simultaneously achieve both accuracy and speed. Centered on a multi-sensor real-time mutual calibration mechanism, it uses the absolute measurement value provided by the NV color center as a benchmark to perform real-time calibration of the zero-point frequency shift and slope offset of the magnetic field response curve caused by TMR zero drift, temperature drift, and hysteresis. Simultaneously, it utilizes the rapid response of the TMR to acquire magnetic measurement data and guide the NV measurement loop, thereby achieving high-sensitivity measurement of magnetic field signals over a wide frequency band. In the entire magnetic tracking technology described above, the overall system performance is significantly improved, specifically: the dynamic tracking bandwidth can be increased by two orders of magnitude while maintaining nT-level absolute accuracy. This method eliminates the need for frequent measurement interruptions for calibration to suppress TMR sensor drift, and also eliminates the need to sacrifice sensitivity to increase the bandwidth of the NV color center sensor, significantly enhancing the system's adaptability and reliability in complex dynamic environments.

[0098] Figure 4 This is a structural diagram of a multi-sensitive unit cross-calibration tracking quantum magnetic measurement system for tunneling magnetoresistance and diamond color centers according to a preferred embodiment of the present invention.

[0099] like Figure 4 As shown, this invention provides a multi-sensitive unit cross-calibration tracking quantum magnetic measurement system using tunneling magnetoresistance and diamond color centers. The system includes:

[0100] Measurement unit 401 is used to measure the absolute magnetic field value of microwave signals based on the NV color center sensing unit;

[0101] Preferably, the measurement unit 401, used for measuring the absolute magnetic field value of the microwave signal based on the NV color center sensing unit, includes:

[0102] The formula for calculating the absolute magnetic field value of microwave signals based on NV color center sensing elements is as follows:

[0103]

[0104] Among them, f A f B The points A and B on the measurement demodulation curve of the NV color center sensitive unit correspond to the microwave frequencies of the characteristic extrema. These are fundamental physical constants.

[0105] Calibration unit 402 is used to determine the calibration parameters of the TMR sensing unit based on the absolute magnetic field value;

[0106] Preferably, the calibration unit 402 is used to determine the calibration parameters of the TMR sensing unit based on the absolute magnetic field value, and the parameter model used for the calibration parameters is:

[0107] B NV =K×V TMR +B0#(2)

[0108] Among them, B NV It is the absolute magnetic field value measured by the NV color center sensing unit, V TMR Let B be the real-time output voltage of the TMR sensing element, K be the scale coefficient, and B0 be the zero-point offset of the TMR sensing element. Substituting B... NV and V TMR Initialize and solve for the scale coefficient K and zero offset B0.

[0109] The acquisition unit 403 is used to convert the voltage value output by the TMR sensing unit with determined calibration parameters into a TMR predicted magnetic field, and to obtain the TMR predicted microwave frequency through the TMR predicted magnetic field.

[0110] Preferably, the acquisition unit 403 is used to convert the voltage value output by the TMR sensing unit with determined calibration parameters into a TMR predicted magnetic field, and to obtain the TMR predicted microwave frequency through the TMR predicted magnetic field, including:

[0111] Based on the preset sampling rate, the voltage value output by the TMR sensitive unit is sampled at high speed, and the voltage value is converted into the TMR predicted magnetic field through the parameter model.

[0112] The calculation unit 404 is used to calculate the NV measurement magnetic field based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the previous period of the NV color center sensitive unit; and to calculate the magnetic field tracking signal based on the TMR predicted magnetic field and the NV measurement magnetic field, and to use the magnetic field tracking signal as the final magnetic field strength value.

[0113] Preferably, the calculation unit 404 is used to calculate the NV measurement magnetic field based on the TMR predicted microwave frequency and the NV predicted frequency calculated by the NV color center sensitive unit before the period, including:

[0114]

[0115] Among them, B NVC For NV to measure the magnetic field, f A and f B σ is the predicted NV frequency calculated for the preceding period of the TMR-predicted microwave frequency or the NV color center sensitive element. A and σ B k is the demodulation error value. A and k B This is based on the slope of the adaptive demodulation curve.

[0116] Preferably, the calculation unit 404 is further configured to:

[0117] The TMR output error value is calculated based on the final magnetic field strength value, and the calibration parameters of the TMR sensitive unit are adjusted based on the TMR output error value.

[0118] Preferably, the calculation unit 404 is used to calculate the TMR output error value based on the final magnetic field strength value, and to adjust the calibration parameters of the TMR sensing unit based on the TMR output error value, including:

[0119] The TMR output error value σ is calculated using the following formula. TMR :

[0120] σ TMR =B output (t)-(K×V TMR +B0)#(4)

[0121] Among them, B output (t) represents the final magnetic field strength value, V TMR is the real-time output voltage of the TMR sensing element, K is the scale coefficient, and B0 is the zero-point offset of the TMR sensing element.

[0122] The present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements steps such as a multi-sensitive unit cross-calibration tracking quantum magnetic measurement method for tunnel magnetoresistance and diamond color centers.

[0123] This invention provides an electronic device, comprising:

[0124] The aforementioned computer-readable storage medium; and

[0125] One or more processors for executing a program in a computer-readable storage medium.

[0126] This technology is applicable to wideband, high-precision magnetic field dynamic tracking scenarios such as dynamic leakage magnetic field detection in industrial equipment and current monitoring in power systems.

[0127] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0128] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0132] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0133] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0134] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

Claims

1. A quantum magnetic measurement method for cross-calibration tracking of multiple sensitive units using tunneling magnetoresistance and diamond color centers, characterized in that, The method includes: The absolute magnetic field value of microwave signals is measured based on the NV color center sensing element; The calibration parameters of the TMR sensing element are determined based on the absolute magnetic field value; The voltage value output by the TMR sensing unit, whose calibration parameters are determined, is converted into a TMR predicted magnetic field, and the TMR predicted microwave frequency is obtained through the TMR predicted magnetic field. The NV measurement magnetic field is calculated based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the previous period of the NV color center sensitive unit. Based on the TMR predicted magnetic field and the NV measured magnetic field, the magnetic field tracking signal is calculated, and the magnetic field tracking signal is used as the final magnetic field strength value.

2. The method according to claim 1, characterized in that, The method further includes: The TMR output error value is calculated based on the final magnetic field strength value, and the calibration parameters of the TMR sensing unit are adjusted based on the TMR output error value.

3. The method according to claim 1, characterized in that, The measurement of the absolute magnetic field value of the microwave signal based on the NV color center sensing element includes: The formula for calculating the absolute magnetic field value of the microwave signal based on the NV color center sensing element is as follows: Among them, f A f B The points A and B on the measurement demodulation curve of the NV color center sensitive unit correspond to the microwave frequencies of the characteristic extrema. These are fundamental physical constants.

4. The method according to claim 3, characterized in that, The calibration parameters of the TMR sensing element are determined based on the absolute magnetic field value, and the parameter model used for the calibration parameters is as follows: B NV =K×V TMR +B0#(2) Among them, B NV The absolute magnetic field value, V, is measured by the NV color center sensing unit. TMR Let B be the real-time output voltage of the TMR sensing element, K be the scale coefficient, and B0 be the zero-point offset of the TMR sensing element. Substituting B... NV and V TMR Initialize and solve for the scale coefficient K and zero offset B0.

5. The method according to claim 4, characterized in that, The step of converting the voltage value output by the TMR sensing unit, which determines the calibration parameters, into a TMR predicted magnetic field, and obtaining the TMR predicted microwave frequency through the TMR predicted magnetic field, includes: Based on a preset sampling rate, the voltage value output by the TMR sensing unit is sampled at high speed, and the voltage value is converted into a TMR predicted magnetic field through the parameter model.

6. The method according to claim 5, characterized in that, The calculation of the NV measurement magnetic field based on the TMR predicted microwave frequency and the NV predicted frequency calculated from the previous period of the NV color center sensing unit includes: Among them, B NVC For NV to measure the magnetic field, f A and f B σ is the microwave frequency predicted by TMR or the NV predicted frequency calculated in the previous period of the NV color center sensitive unit. A and σ B k is the demodulation error value. A and k B This is based on the slope of the adaptive demodulation curve.

7. The method according to claim 2, characterized in that, The process of calculating the TMR output error value based on the final magnetic field strength value, and adjusting the calibration parameters of the TMR sensing unit based on the TMR output error value, includes: The TMR output error value σ is calculated using the following formula. TMR : σ TMR =B output (t)-(K×V TMR +B0)#(4) Among them, B output (t) represents the final magnetic field strength value, V TMR is the real-time output voltage of the TMR sensing element, K is the scale coefficient, and B0 is the zero-point offset of the TMR sensing element.

8. A multi-sensor unit cross-calibration tracking quantum magnetic measurement system using tunneling magnetoresistance and diamond color centers, characterized in that, The system includes: Measurement unit, used to measure the absolute magnetic field value of microwave signals based on NV color center sensing unit; A calibration unit is used to determine the calibration parameters of the TMR sensing unit based on the absolute magnetic field value; The acquisition unit is used to convert the voltage value output by the TMR sensing unit with determined calibration parameters into a TMR predicted magnetic field, and to obtain the TMR predicted microwave frequency through the TMR predicted magnetic field. The calculation unit is used to calculate the NV measurement magnetic field based on the TMR predicted microwave frequency or the NV predicted frequency calculated by the previous period of the NV color center sensing unit; and to calculate the magnetic field tracking signal based on the TMR predicted magnetic field and the NV measurement magnetic field, and to use the magnetic field tracking signal as the final magnetic field strength value.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-7.

10. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 9; as well as One or more processors for executing a program in the computer-readable storage medium.

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