Modulation and demodulation device and method, electronic equipment and measuring equipment

Abstract

The invention relates to the field of NV color center magnetic sensors, and discloses a modulation and demodulation device and method, electronic equipment and measuring equipment, and the device comprises a modulation and demodulation module which is connected with a signal source and an NV color center detection device, and is used for carrying out modulation and demodulation processing on a fluorescence signal generated by the NV color center detection device based on a reference signal of a modulation frequency generated by the signal source, extracting a harmonic signal of a to-be-measured magnetic field frequency and / or a to-be-measured magnetic field frequency doubling in the fluorescence signal to obtain a first effective signal and a second effective signal and / or a third effective signal; and the signal processing module is connected with the modulation-demodulation module and is used for generating a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal so as to determine the magnetic field size of the magnetic field to be measured according to the demodulation signal. According to the device, through multi-link combination, the high bandwidth characteristic of the fundamental frequency of the magnetic field to be measured and the double frequency of the magnetic field to be measured is utilized, the bandwidth of magnetic measurement is improved, and the requirement of high-frequency magnetic field measurement is met.

Description

Technical Field

[0001] The present invention relates to the field of NV color center magnetic sensors, and in particular to a modulation and demodulation device, method, electronic equipment, and measuring equipment. Background Art

[0002] NV color center magnetic sensors are generally used in high-precision geomagnetic measurement applications. Such applications focus on the performance in the bandwidth range below 300 Hz and generally do not measure magnetic signals above 1 kHz. Therefore, there are almost no additional requirements for the magnetic measurement bandwidth of NV color centers.

[0003] In recent years, as NV color centers have been gradually applied to power grid systems and other fields, the magnetic measurement bandwidth of NV color centers has hindered their application in power grid systems and other fields. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the present invention is to provide a modulation and demodulation device, which improves the bandwidth of magnetic measurement by combining different links and utilizing the high bandwidth characteristics of the fundamental frequency of the magnetic field to be measured and the double frequency of the magnetic field to be measured, thereby meeting the requirements of high-frequency magnetic field measurement.

[0005] The second object of the present invention is to provide a modulation and demodulation method.

[0006] A third objective of the present invention is to provide an electronic device.

[0007] A fourth object of the present invention is to provide a measuring device.

[0008] To achieve the above-mentioned purpose, the first aspect of the present invention proposes a modulation and demodulation device, which includes: a modulation and demodulation module, which is connected to a signal source and an NV color center detection device, and is used to modulate and demodulate the fluorescence signal generated by the NV color center detection device based on a reference signal of the modulation frequency generated by the signal source, and to extract and process the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal to obtain a first effective signal, as well as a second effective signal and / or a third effective signal, wherein the fluorescence signal is generated by the NV color center detection device based on the reference signal of the modulation frequency generated by the signal source to detect the magnetic field to be measured; a signal processing module, which is connected to the modulation and demodulation module, and is used to generate a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal, so as to determine the magnetic field size of the magnetic field to be measured according to the demodulation signal.

[0009] The modulation and demodulation device according to the embodiment of the present invention improves the bandwidth of magnetic measurement by combining different links and utilizing the high bandwidth characteristics of the fundamental frequency and the double frequency of the magnetic field to be measured, thereby meeting the requirements of high-frequency magnetic field measurement.

[0010] In addition, the modulation and demodulation device proposed in the above embodiment of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the modulation and demodulation module includes: a first link, connected to the signal source and the NV color center detection device, and used to perform modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency to obtain the first effective signal; a second link, connected to the NV color center detection device, and used to extract the harmonic signal of the frequency of the magnetic field to be measured in the fluorescence signal to obtain the second effective signal; a third link, connected to the NV color center detection device, and used to extract the harmonic signal of the twice frequency of the magnetic field to be measured in the fluorescence signal, and perform a two-division process on the extracted harmonic signal to obtain the third effective signal.

[0011] According to one embodiment of the present invention, the first link includes: a digital multiplier, a first input end of the digital multiplier is connected to the output end of the signal source, and a second input end of the digital multiplier is connected to the output end of the NV color center detection device, for mixing the reference signal of the modulation frequency and the fluorescence signal to generate a first signal of the magnetic field frequency to be measured and a second frequency, wherein the second frequency is greater than the magnetic field frequency to be measured; a first filter, an input end of the first filter is connected to the output end of the digital multiplier, for filtering out the high-frequency component of the first signal to obtain the first effective signal.

[0012] According to one embodiment of the present invention, the second link includes: a second filter, a first end of the second filter is connected to the output end of the NV color center detection device, and is used to filter out the low-frequency component in the fluorescence signal to obtain the second effective signal.

[0013] According to one embodiment of the present invention, the third link includes: a third filter, the input end of the third filter is connected to the output end of the NV color center detection device, and is used to filter out the low-frequency component in the fluorescence signal to obtain a third signal with twice the frequency of the magnetic field to be measured; a digital two-division circuit, the input end of the digital two-division circuit is connected to the output end of the third filter, and is used to perform two-division processing on the third signal to generate the third effective signal.

[0014] According to one embodiment of the present invention, the signal processing module includes: a digital adder, a first input end of the digital adder is connected to the output end of the first filter, a second input end of the digital adder is connected to the output end of the second filter, and a third input end of the digital adder is connected to the output end of the digital two-division circuit, and is used to perform addition operation on the first effective signal, the second effective signal and the third effective signal to obtain the demodulated signal.

[0015] According to one embodiment of the present invention, the device includes: a first gain and phase control module, connected between the digital adder and the first filter, for compensating for the amplitude response and delay difference of the first effective signal; a second gain and phase control module, connected between the digital adder and the second filter, for compensating for the amplitude response and delay difference of the second effective signal; a third gain and phase control module, connected between the digital adder and the digital binary frequency division circuit, for compensating for the amplitude response and delay difference of the third effective signal.

[0016] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes a modulation and demodulation method for an NV color center detection device, wherein the NV color center detection device detects a magnetic field to be measured based on a reference signal of a modulation frequency generated by a signal source to generate a fluorescence signal, and the method comprises: performing modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency, and extracting and processing the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal to obtain a first effective signal, as well as a second effective signal and / or a third effective signal; generating a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal to determine the magnetic field size of the magnetic field to be measured according to the demodulation signal.

[0017] To achieve the above-mentioned purpose, the third aspect of the present invention proposes an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the modulation and demodulation method proposed in the second aspect of the present invention is implemented.

[0018] To achieve the above-mentioned purpose, a fourth embodiment of the present invention proposes a measuring device, including a signal source, an NV color center detection device and a modulation and demodulation device as described in the first embodiment of the present invention.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1is a schematic diagram of a modulation and demodulation device according to an embodiment of the present invention; FIG2 (a) is a schematic diagram of the frequency spectrum distribution of the theoretical response of the NV fluorescence signal according to an embodiment of the present invention; FIG2( b ) is an enlarged schematic diagram of region A in FIG2( a ); FIG3 (a) is a schematic diagram of the NV color center absorption peak under low power microwave driving according to an embodiment of the present invention; FIG3( b ) is a schematic diagram of the frequency spectrum distribution of NV fluorescence signals under low-power microwave driving according to an embodiment of the present invention; FIG4 (a) is a schematic diagram of the NV color center absorption peak under high power consumption microwave driving according to an embodiment of the present invention; FIG4( b ) is a schematic diagram of the frequency spectrum distribution of NV fluorescence signals driven by high power microwaves according to an embodiment of the present invention; Figure 5 is a schematic diagram of a modulation and demodulation device according to a specific embodiment of the present invention; Figure 6 is a flow chart of a modulation and demodulation method according to an embodiment of the present invention; Figure 7 is a structural block diagram of an electronic device according to an embodiment of the present invention; Figure 8 is a schematic diagram of a measuring device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] It should be noted that the function of the NV color center magnetic sensor depends on the principle of phase-locked modulation and demodulation, and its bandwidth is also limited by this principle. From the principle of modulation and demodulation, the bandwidth of the NV color center magnetic sensor cannot exceed 1 / 2 of the modulation frequency, and is usually estimated as 1 / 10 of the modulation frequency. It has a relatively flat frequency response within this range. Theoretical analysis and experimental studies have shown that the effective signal amplitude of the NV color center magnetic sensor is close to an inversely proportional relationship with the modulation frequency. Too high a modulation frequency will lower the effective signal amplitude, resulting in reduced magnetic measurement accuracy. From an experimental point of view, the modulation frequency is generally selected in the range of 1kHz~30kHz, so the bandwidth of the NV color center magnetic sensor generally does not exceed 3kHz, and is usually set below 1kHz.

[0023] According to the grid specifications, the current transformer used for current measurement should achieve a measurement bandwidth of more than 3kHz, and some high-performance current sensors should achieve a measurement capability of more than 10kHz. This places high demands on the NV color center system.

[0024] In the relevant power grid system, the current transformer needs to assume a part of the protection function, and disconnect the power grid system in time when a large current appears to protect the sensitive units of the power grid. This requires the current transformer to have a high response speed and also puts forward high requirements for the magnetic measurement bandwidth.

[0025] In this context, the issue of improving the bandwidth of NV color center magnetic sensors becomes very important. In related technologies, the following two solutions are available to improve the bandwidth of NV color centers, but both are accompanied by unacceptable negative effects. Among them, Solution 1 is to abandon the modulation and demodulation solution and directly measure the fluorescence signal of the NV color center. In this case, the magnetic measurement bandwidth is not limited by the modulation and demodulation principle, but the measurement accuracy is significantly reduced, and there is an obvious multi-value response problem. Solution 2 is to retain the modulation and demodulation solution, but greatly increase the modulation and demodulation frequency. This can maximize the bandwidth within the framework of the modulation and demodulation principle, but the increase in the modulation and demodulation frequency is limited, and it will reduce the signal amplitude and cause a decrease in the accuracy of current measurement. From a system perspective, this will also increase the amount of data in the system, requiring faster analog-to-digital conversion acquisition, a larger data processing system, and higher power consumption, which will cause greater problems at the system reliability level.

[0026] To solve the above problems, the present invention provides a modulation and demodulation device, method, electronic equipment, and measuring equipment. The following describes the modulation and demodulation device, method, electronic equipment, and measuring equipment of the present invention in detail in conjunction with the accompanying drawings and specific implementation methods.

[0027] Figure 1 FIG. 1 is a schematic diagram of a modulation and demodulation device according to an embodiment of the present invention. Figure 1 As shown, the modem device may include: A modulation and demodulation module is connected to the signal source and the NV color center detection device, and is used to perform modulation and demodulation processing on the fluorescence signal generated by the NV color center detection device based on a reference signal of the modulation frequency generated by the signal source, and to extract and process the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal to obtain a first effective signal, and a second effective signal and / or a third effective signal, wherein the fluorescence signal is generated by the NV color center detection device by detecting the magnetic field to be measured based on the reference signal of the modulation frequency generated by the signal source; The signal processing module is connected to the modulation and demodulation module, and is used to generate a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal, so as to determine the magnetic field size of the magnetic field to be measured according to the demodulation signal.

[0028] The embodiments of the present invention aim at the problem of NV color center bandwidth and broaden the NV color center bandwidth from the perspective of signal processing.

[0029] Studies have shown that the NV color center itself has a certain nonlinear response behavior, and complex sidelobe signal peaks appear in the modulation and demodulation signal. Specifically, if the NV color center has a strict theoretical response, the signal frequency spectrum distribution of the NV color center magnetic sensor should meet the characteristics shown in Figure 2 (a), where Figure 2 (b) is an enlarged schematic diagram of area A in Figure 2 (a), that is, the fluorescence signal output by the NV color center should be and The main lobe signal peak appears at two frequency points, among which, , , represents the modulation frequency of the reference signal generated by the signal source, Indicates the frequency of the magnetic field to be measured.

[0030] However, in actual operation, the nonlinear response of the NV center itself will destroy this law. Experiments show that when the microwave power driving the NV center is small and the magnetic field frequency is high, the NV center absorption peak splits into three, and the shape of each absorption peak is close to the Lorentz line shape, see Figure 3 (a). At this time, the fluorescence signal directly output by the NV center will be The position of the nonlinear harmonic signal is generated, see Figure 3 (b). When the microwave power driving the NV center is large and the magnetic field frequency is high, the three absorption peaks of the NV center are transformed into Gaussian line shape, and the width gradually increases until it merges into one absorption peak, see Figure 4 (a). At this time, the fluorescence signal directly output by the NV center will be at the double frequency of the magnetic field frequency. The position generates nonlinear harmonic signals, see Figure 4(b).

[0031] In the phase-locked modulation and demodulation device, a multiplier and a low-pass filter are used to filter out the nonlinear harmonic signal, which does not affect the demodulation signal output by the phase-locked modulation and demodulation device. and The fluorescence signal is retained as the output demodulation signal.

[0032] In order to broaden the bandwidth of the NV color center, an embodiment of the present invention uses a modulation and demodulation module to perform 2-way or 3-way processing on the fluorescence signal generated by the NV color center detection device, and uses a signal processing module to add and output the signals obtained after the 2-way or 3-way processing to generate a demodulation signal, so as to generate the magnetic field size of the magnetic field to be measured or the current size of the current to be measured according to the demodulation signal.

[0033] Specifically, when the modulation and demodulation module performs two-way processing, one way the modulation and demodulation module processes the fluorescence signal generated by the NV color center detection device is: based on the reference signal of the modulation frequency generated by the signal source, the NV color center detection device performs modulation and demodulation processing on the fluorescence signal generated by the detection of the magnetic field to be measured, so as to realize the phase-locked modulation and demodulation function. The other way is to extract the nonlinear harmonic signal of the fundamental frequency of the magnetic field to be measured (the frequency of the magnetic field to be measured) in the fluorescence signal, or to extract the nonlinear harmonic signal of the double frequency of the magnetic field to be measured in the fluorescence signal. When the modulation and demodulation module performs three-way processing, one way is: based on the reference signal of the modulation frequency generated by the signal source, the NV color center detection device performs modulation and demodulation processing on the fluorescence signal generated by the detection of the magnetic field to be measured. The other two ways are: extracting the nonlinear harmonic signal of the fundamental frequency of the magnetic field to be measured (the frequency of the magnetic field to be measured) and the double frequency of the magnetic field to be measured in the fluorescence signal.

[0034] The first effective signal and the second effective signal are added to generate a demodulation signal. Or the first effective signal and the third effective signal are added to generate a demodulation signal. Or the first effective signal, the second effective signal and the third effective signal are added to generate a demodulation signal. According to the demodulation signal output by the modulation and demodulation device, the magnetic field size of the magnetic field to be measured can be determined. When the current is detected, the current size can be determined according to the magnetic field size to achieve the detection of the current.

[0035] The modulation and demodulation device of the embodiment of the present invention uses the modulation and demodulation module to perform multiplexing on the fluorescence signal generated by the NV color center detection device, and generates a demodulation signal based on the signal obtained by modulating and demodulating the fluorescence signal based on the reference signal of the modulation frequency, and the signal of the fundamental frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured extracted from the fluorescence signal. The embodiment of the present invention broadens the bandwidth of the NV color center.

[0036] In one embodiment of the present invention, Figure 5 As shown, the NV color center detection device may include a microwave source, a laser source, an NV color center diamond (NV color center), a photodetector, and an analog-to-digital conversion module. The microwave source generates a microwave signal of a target frequency based on a reference signal of a modulation frequency generated by a signal source, and the NV color center diamond generates a change in fluorescence intensity based on the microwave signal of the target frequency generated by the microwave source and the magnetic field frequency of the magnetic field to be measured under the action of a laser source. The photodetector converts the change in fluorescence intensity generated by the NV color center diamond into an analog electrical signal, and the analog-to-digital conversion module converts the analog electrical signal generated by the photodetector into a digital electrical signal (fluorescence signal).

[0037] In one embodiment of the present invention, Figure 5 As shown, the modem module may include: A first link is connected to the signal source and the NV color center detection device, and is used to modulate and demodulate the fluorescence signal based on a reference signal of the modulation frequency to obtain a first effective signal; The second link is connected to the NV color center detection device and is used to extract the harmonic signal of the magnetic field frequency to be measured in the fluorescence signal to obtain a second effective signal; The third link is connected to the NV color center detection device, and is used to extract the harmonic signal of the double frequency of the magnetic field to be measured in the fluorescence signal, and perform binary frequency division processing on the extracted harmonic signal to obtain a third effective signal.

[0038] The modulation and demodulation module in the embodiment of the present invention may include a first link, a second link and a third link, so as to perform multiplexing processing on the fluorescence signal using the three links.

[0039] Among them, the first link is used to modulate and demodulate the fluorescence signal generated by the NV color center detection device to detect the magnetic field to be measured based on the reference signal of the modulation frequency generated by the signal source, obtain the first effective signal, and realize the phase-locked modulation and demodulation function. The second link extracts the nonlinear harmonic signal of the fundamental frequency of the magnetic field to be measured (the frequency of the magnetic field to be measured) in the fluorescence signal to obtain the second effective signal. The third link extracts the nonlinear harmonic signal of the double frequency of the magnetic field to be measured in the fluorescence signal, and performs a two-frequency division process on the extracted harmonic signal to obtain the third effective signal.

[0040] In one embodiment of the present invention, Figure 5 As shown, the first link may include: A digital multiplier, wherein a first input terminal of the digital multiplier is connected to an output terminal of the signal source, and a second input terminal of the digital multiplier is connected to an output terminal of the NV color center detection device, and is used to mix a reference signal of the modulation frequency and a fluorescence signal to generate a first signal having a magnetic field frequency to be measured and a second frequency, wherein the second frequency is greater than the magnetic field frequency to be measured; The first filter has an input end connected to the output end of the digital multiplier and is used to filter out the high-frequency component of the first signal to obtain a first effective signal.

[0041] In a specific embodiment, the first filter may be a digital low-pass filter. Exemplarily, the cut-off frequency of the digital low-pass filter may be less than the modulation frequency It should be noted that the embodiment of the present invention does not limit the cut-off frequency of the digital low-pass filter.

[0042] Specifically, the digital multiplier modulates the frequency The reference signal and the fluorescence signal are mixed to generate the magnetic field frequency to be measured and the second frequency The first filter filters out the high frequency component in the first signal, that is, filters out the second frequency component in the first signal. The component of the magnetic field to be measured is obtained The first valid signal.

[0043] In one embodiment of the present invention, Figure 5 As shown, the second link may include: A second filter, wherein a first end of the second filter is connected to an output end of the NV color center detection device, and is used to filter out low-frequency components in the fluorescence signal to obtain a second effective signal.

[0044] In a specific embodiment, the second filter may be a digital high-pass filter. Exemplarily, the cut-off frequency of the digital high-pass filter may be greater than the modulation frequency. It should be noted that the embodiment of the present invention does not limit the cut-off frequency of the digital high-pass filter.

[0045] Specifically, the second filter is used to extract the signal of the fundamental frequency of the magnetic field to be measured in the fluorescence signal to isolate the larger low-frequency noise on the link to avoid affecting the magnetic measurement accuracy.

[0046] In one embodiment of the present invention, Figure 5 As shown, the third link includes: A third filter, wherein the input end of the third filter is connected to the output end of the NV color center detection device, and is used to filter out the low-frequency component in the fluorescence signal to obtain a third signal of the double frequency of the magnetic field to be measured; A digital two-frequency division circuit, the input end of which is connected to the output end of the third filter, is used to perform two-frequency division processing on the third signal to generate a third effective signal.

[0047] In a specific embodiment, the third filter may be a digital high-pass filter. Exemplarily, the cut-off frequency of the digital high-pass filter may be greater than the modulation frequency. It should be noted that the embodiment of the present invention does not limit the cut-off frequency of the digital high-pass filter.

[0048] Specifically, the third filter is used to extract the second frequency of the magnetic field to be measured in the fluorescence signal. The third signal (third signal) is used to isolate the large low-frequency noise on the link to avoid affecting the magnetic measurement accuracy. The third signal output by the third filter is input into the digital two-frequency division circuit to change the frequency of the third signal by using the digital two-frequency division circuit, so that the effective signal changes from the magnetic field double frequency to the signal with the same frequency as the magnetic field to be measured.

[0049] In one embodiment of the present invention, Figure 5 As shown, the signal processing module includes: A digital adder, wherein a first input end of the digital adder is connected to an output end of a first filter, a second input end of the digital adder is connected to an output end of a second filter, and a third input end of the digital adder is connected to an output end of a digital two-frequency dividing circuit, and is used to perform addition processing on a first effective signal, a second effective signal and / or a third effective signal to obtain a demodulated signal.

[0050] Specifically, a digital adder may be used to perform addition operation on the first effective signal, the second effective signal and the third effective signal to generate a demodulated signal.

[0051] In one embodiment of the present invention, Figure 5 As shown, the modem device may include: A first gain and phase control module, connected between the digital adder and the first filter, for compensating for the amplitude response and delay difference of the first effective signal; A second gain and phase control module, connected between the digital adder and the second filter, for compensating for the amplitude response and delay difference of the second effective signal; The third gain and phase control module is connected between the digital adder and the digital two-frequency dividing circuit, and is used to compensate for the amplitude response and delay difference of the third effective signal.

[0052] Specifically, before the three effective signals enter the digital adder, a gain and phase control module is set on each path. By multiplying the effective signals on each link with different gain coefficients in the gain and phase control module, the amplitude response and delay differences of the effective signals on each link are compensated to adjust the magnetic measurement frequency flatness of the system and achieve a flat frequency response of the magnetic measurement.

[0053] The modulation and demodulation device in the embodiment of the present invention improves the bandwidth of magnetic measurement by combining different links and utilizing the high bandwidth characteristics of the fundamental frequency and the double frequency of the magnetic field to be measured, thereby meeting the requirements of high-frequency magnetic field measurement.

[0054] The modulation and demodulation device in the embodiment of the present invention adds a high-pass filter in the fundamental frequency and double frequency links of the magnetic field to be measured, thereby reducing the impact of the more serious low-frequency noise in the link on the system and ensuring that the entire magnetic measurement system has a high magnetic measurement sensitivity.

[0055] The modulation and demodulation device in the embodiment of the present invention adjusts the gain and phase of the three links to compensate for the differences in amplitude response and delay in different links, thereby improving the frequency response flatness at the system level.

[0056] The invention provides a modulation and demodulation method.

[0057] The modulation and demodulation method in the embodiment of the present invention is used in an NV color center detection device. The NV color center detection device detects the magnetic field to be measured based on a reference signal of the modulation frequency generated by a signal source to generate a fluorescence signal.

[0058] Figure 6 FIG. 1 is a flow chart of a modulation and demodulation method according to an embodiment of the present invention. Figure 6 As shown, the modulation and demodulation method may include: S101, performing modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency, and extracting and processing the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal, to obtain a first effective signal, a second effective signal and / or a third effective signal; S102: Generate a demodulation signal according to the first valid signal and the second valid signal and / or the third valid signal, so as to determine the magnetic field magnitude of the magnetic field to be measured according to the demodulation signal.

[0059] In order to broaden the bandwidth of NV color center, the embodiment of the present invention performs 2-way or 3-way processing on the fluorescence signal generated by the NV color center detection device, and uses a signal processing module to add and output the signals obtained after the 2-way or 3-way processing to generate a demodulation signal, so as to generate the magnetic field size of the magnetic field to be measured or the current size of the current to be measured according to the demodulation signal.

[0060] In one embodiment of the present invention, modulation and demodulation processing of a fluorescence signal based on a reference signal of a modulation frequency may include: mixing the reference signal of the modulation frequency and the fluorescence signal to generate a first signal of a magnetic field frequency to be measured and a second frequency, wherein the second frequency is greater than the magnetic field frequency to be measured; filtering out the high-frequency component of the first signal to obtain a first effective signal.

[0061] In one embodiment of the present invention, extracting and processing the harmonic signal of the frequency of the magnetic field to be measured in the fluorescence signal may include: filtering out the low-frequency component in the fluorescence signal to obtain a second effective signal.

[0062] In one embodiment of the present invention, extracting and processing the harmonic signal of the twice frequency of the magnetic field to be measured in the fluorescence signal may include: filtering out the low-frequency component in the fluorescence signal to obtain a third signal of the twice frequency of the magnetic field to be measured; performing a two-frequency division process on the third signal to generate a third effective signal.

[0063] In one embodiment of the present invention, generating a demodulated signal according to the first valid signal and the second valid signal and / or the third valid signal may include: performing an addition operation on the first valid signal, the second valid signal and / or the third valid signal to obtain the demodulated signal.

[0064] In one embodiment of the present invention, before generating a demodulated signal according to the first effective signal and the second effective signal and / or the third effective signal, the method further includes: performing gain and phase control processing on the first effective signal and the second effective signal and / or the third effective signal.

[0065] It should be noted that, for other specific implementations of the modulation and demodulation method provided in the embodiment of the present invention, reference may be made to other specific implementations of the modulation and demodulation device in the above embodiment of the present invention.

[0066] The modulation and demodulation method of the embodiment of the present invention improves the bandwidth of magnetic measurement by combining different links and utilizing the high bandwidth characteristics of the fundamental frequency and the double frequency of the magnetic field to be measured, thereby meeting the requirements of high-frequency magnetic field measurement.

[0067] The invention provides an electronic device.

[0068] In this embodiment, the electronic device may include a memory and a processor, wherein a computer program is stored in the memory, and the computer program is characterized in that when the computer program is executed by the processor, the modulation and demodulation method as described above is implemented.

[0069] Figure 7 It is a structural block diagram of an electronic device according to an embodiment of the present invention.

[0070] like Figure 7 As shown, the electronic device 500 includes: a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, such as through a bus 502. Optionally, the electronic device 500 may also include a transceiver 504. It should be noted that in actual applications, the transceiver 504 is not limited to one, and the structure of the electronic device 500 does not constitute a limitation on the embodiments of the present invention.

[0071] The processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the present invention. The processor 501 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0072] The bus 502 may include a path to transmit information between the above components. The bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The bus 502 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0073] The memory 503 is used to store a computer program corresponding to the modulation and demodulation method of the above embodiment of the present invention, and the computer program is controlled and executed by the processor 501. The processor 501 is used to execute the computer program stored in the memory 503 to implement the content shown in the above method embodiment.

[0074] Among them, the electronic device 500 includes but is not limited to: mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The electronic device 500 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0075] The invention provides a measuring device.

[0076] Figure 8 FIG. 1 is a schematic diagram of a measuring device according to an embodiment of the present invention. Figure 8 As shown, the measuring device may include a signal source 100 , an NV color center detection device 200 , and a modulation and demodulation device 300 as described above.

[0077] The electronic device and the measuring device in the embodiment of the present invention can be used in the fields of low-frequency geomagnetic measurement and high-frequency current measurement. The embodiment of the present invention does not limit the application field of the electronic device and the measuring device.

[0078] The electronic device and the measuring device in the embodiment of the present invention can measure high-frequency magnetic fields.

[0079] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0080] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0083] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0086] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A modulation and demodulation device, characterized in that: The device comprises: A modulation and demodulation module is connected to the signal source and the NV color center detection device, and is used to perform modulation and demodulation processing on the fluorescence signal generated by the NV color center detection device based on a reference signal of the modulation frequency generated by the signal source, and to extract and process the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal to obtain a first effective signal, and a second effective signal and / or a third effective signal, wherein the fluorescence signal is generated by the NV color center detection device by detecting the magnetic field to be measured based on the reference signal of the modulation frequency generated by the signal source; The signal processing module is connected to the modulation and demodulation module, and is used to generate a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal, so as to determine the magnetic field size of the magnetic field to be measured according to the demodulation signal.

2. The modulation and demodulation device according to claim 1, characterized in that: The modulation and demodulation module comprises: a first link connected to the signal source and the NV color center detection device, and configured to perform modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency to obtain the first effective signal; A second link is connected to the NV color center detection device and is used to extract the harmonic signal of the magnetic field frequency to be measured in the fluorescence signal to obtain the second effective signal; The third link is connected to the NV color center detection device, and is used to extract the harmonic signal of the double frequency of the magnetic field to be measured in the fluorescence signal, and perform binary frequency division processing on the extracted harmonic signal to obtain the third effective signal.

3. The modulation and demodulation device according to claim 2, characterized in that: The first link comprises: A digital multiplier, wherein a first input end of the digital multiplier is connected to an output end of the signal source, and a second input end of the digital multiplier is connected to an output end of the NV color center detection device, and is used to mix the reference signal of the modulation frequency and the fluorescence signal to generate a first signal of the magnetic field frequency to be measured and a second frequency, wherein the second frequency is greater than the magnetic field frequency to be measured; A first filter, wherein an input end of the first filter is connected to an output end of the digital multiplier, and is used for filtering out high-frequency components of the first signal to obtain the first effective signal.

4. The modulation and demodulation device according to claim 2, characterized in that: The second link comprises: A second filter, wherein a first end of the second filter is connected to an output end of the NV color center detection device, and is used to filter out low-frequency components in the fluorescence signal to obtain the second effective signal.

5. The modulation and demodulation device according to claim 2, characterized in that: The third link comprises: a third filter, wherein the input end of the third filter is connected to the output end of the NV color center detection device, and is used to filter out the low-frequency component in the fluorescence signal to obtain a third signal of the double frequency of the magnetic field to be measured; A digital two-frequency division circuit, wherein the input end of the digital two-frequency division circuit is connected to the output end of the third filter, and is used for performing two-frequency division processing on the third signal to generate the third effective signal.

6. The modulation and demodulation device according to any one of claims 3 to 5, characterized in that: The signal processing module comprises: A digital adder, wherein a first input end of the digital adder is connected to an output end of a first filter, a second input end of the digital adder is connected to an output end of a second filter, and a third input end of the digital adder is connected to an output end of a digital two-frequency dividing circuit, and is used to perform addition processing on the first effective signal, the second effective signal and the third effective signal to obtain the demodulated signal.

7. The modulation and demodulation device according to claim 6, characterized in that: The device comprises: A first gain and phase control module, connected between the digital adder and the first filter, and used to compensate for the amplitude response and delay difference of the first effective signal; A second gain and phase control module, connected between the digital adder and the second filter, and used to compensate for the amplitude response and delay difference of the second effective signal; The third gain and phase control module is connected between the digital adder and the digital two-frequency division circuit, and is used to compensate for the amplitude response and delay difference of the third effective signal.

8. A modulation and demodulation method, characterized in that: For an NV color center detection device, the NV color center detection device detects a magnetic field to be measured based on a reference signal of a modulation frequency generated by a signal source to generate a fluorescence signal, the method comprising: Performing modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency, and extracting and processing the harmonic signal of the frequency of the magnetic field to be measured and / or the double frequency of the magnetic field to be measured in the fluorescence signal, so as to obtain a first effective signal, a second effective signal and / or a third effective signal; A demodulation signal is generated according to the first effective signal and the second effective signal and / or the third effective signal, so as to determine the magnetic field magnitude of the magnetic field to be measured according to the demodulation signal.

9. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the computer program is executed by the processor, the modulation and demodulation method as claimed in claim 8 is implemented.

10. A measuring device, characterized in that: It comprises a signal source, an NV color center detection device and a modulation and demodulation device as described in any one of claims 1 to 7.

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