Modulation and Demodulation Device, Method, Electronic Device, and Measuring Device

Abstract

The present invention relates to the field of NV - center magnetic sensors, and discloses a modulation and demodulation device, method, electronic device, and measurement device. The device includes: a modulation and demodulation module, connected to a signal source and an NV - center detection device, for performing modulation and demodulation processing on the fluorescence signal generated by the NV - center detection device based on a reference signal with a modulation frequency generated by the signal source, and extracting harmonic signals of the frequency of the magnetic field to be measured and / or the second - harmonic 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; a signal processing module, connected to the modulation and demodulation module, 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 magnitude of the magnetic field to be measured according to the demodulation signal. Through multi - link combination, the device utilizes the high - bandwidth characteristics of the fundamental frequency of the magnetic field to be measured and the second - harmonic frequency of the magnetic field to be measured to improve the bandwidth of magnetic measurement and meet the requirements of high - frequency magnetic field measurement.

Description

Technical Field

[0001] The present invention relates to the field of NV - color - center magnetic sensors, and particularly to a modulation and demodulation device, method, electronic device, and measurement device. Background Art

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

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

[0004] The present invention aims to at least partly solve one of the technical problems in the related art. To this end, an object of the present invention is to provide a modulation and demodulation device, which, through the combination of different links, utilizes the high - bandwidth characteristics of the fundamental frequency of the magnetic field to be measured and the second - harmonic frequency of the magnetic field to be measured, improves the magnetic measurement bandwidth, and meets the requirements of high - frequency magnetic field measurement.

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

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

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

[0008] To achieve the above object, an embodiment of the first aspect of the present invention provides a modulation and demodulation device. The device includes: a modulation and demodulation module, connected to a signal source and an NV - color - center detection device, for performing modulation and demodulation processing on the fluorescence signal generated by the NV - color - center detection device based on a reference signal with a modulation frequency generated by the signal source, and extracting harmonic signals of the frequency of the magnetic field to be measured and / or the second - harmonic 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 for detecting the magnetic field to be measured based on the reference signal with a modulation frequency generated by the signal source; a signal processing module, connected to the modulation and demodulation module, 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 magnitude of the magnetic field to be measured according to the demodulation signal.

[0009] The modulation and demodulation device according to an embodiment of the present invention combines different links and utilizes the high bandwidth characteristics of the fundamental frequency and the second harmonic frequency of the magnetic field to be measured to improve the bandwidth of magnetic measurement and meet the requirements of high-frequency magnetic field measurement.

[0010] In addition, the modulation and demodulation device proposed according to the above embodiment of the present invention may further have the following additional technical features:

[0011] According to an 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, configured to perform modulation and demodulation processing on the fluorescence signal based on a reference signal of the modulation frequency to obtain a first effective signal; a second link connected to the NV color center detection device, configured to extract a harmonic signal of the frequency of the magnetic field to be measured in the fluorescence signal to obtain a second effective signal; and a third link connected to the NV color center detection device, configured to extract a harmonic signal of the second harmonic frequency of the magnetic field to be measured in the fluorescence signal and perform a frequency division by two on the extracted harmonic signal to obtain a third effective signal.

[0012] According to an embodiment of the present invention, the first link includes: a digital multiplier, 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, configured to mix the reference signal of the modulation frequency and the fluorescence signal to generate a first signal of the frequency of the magnetic field to be measured and a second frequency, where the second frequency is greater than the frequency of the magnetic field to be measured; a first filter, an input end of the first filter is connected to an output end of the digital multiplier, configured to filter out high-frequency components of the first signal to obtain the first effective signal.

[0013] According to an embodiment of the present invention, the second link includes: a second filter, a first end of the second filter is connected to an output end of the NV color center detection device, configured to filter out low-frequency components in the fluorescence signal to obtain the second effective signal.

[0014] According to an embodiment of the present invention, the third link includes: a third filter, an input end of the third filter is connected to an output end of the NV color center detection device, configured to filter out low-frequency components in the fluorescence signal to obtain a third signal of the second harmonic frequency of the magnetic field to be measured; a digital frequency division by two circuit, an input end of the digital frequency division by two circuit is connected to an output end of the third filter, configured to perform a frequency division by two on the third signal to generate the third effective signal.

[0015] According to an embodiment of the present invention, the signal processing module includes: a digital adder, 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 frequency divider circuit, configured to perform an addition operation on the first valid signal, the second valid signal, and the third valid signal to obtain the demodulated signal.

[0016] According to an embodiment of the present invention, the device includes: a first gain and phase adjustment module, connected between the digital adder and the first filter, configured to compensate for the amplitude response and delay difference of the first valid signal; a second gain and phase adjustment module, connected between the digital adder and the second filter, configured to compensate for the amplitude response and delay difference of the second valid signal; a third gain and phase adjustment module, connected between the digital adder and the digital frequency divider circuit, configured to compensate for the amplitude response and delay difference of the third valid signal.

[0017] To achieve the above object, an embodiment of the second aspect of the present invention provides a modulation and demodulation method for an NV center detection device. The NV center detection device detects a magnetic field to be measured based on a reference signal with a modulation frequency generated by a signal source and generates a fluorescence signal. The method includes: performing modulation and demodulation processing on the fluorescence signal based on the reference signal with the modulation frequency, and extracting harmonic signals of the frequency of the magnetic field to be measured and / or twice the frequency of the magnetic field to be measured in the fluorescence signal to obtain a first valid signal, and a second valid signal and / or a third valid signal; generating a demodulated signal according to the first valid signal and the second valid signal and / or the third valid signal, so as to determine the magnitude of the magnetic field to be measured according to the demodulated signal.

[0018] To achieve the above object, an embodiment of the third aspect of the present invention provides an electronic device, including a memory and a processor. A computer program is stored on the memory. When the computer program is executed by the processor, the modulation and demodulation method provided in the embodiment of the second aspect of the present invention is implemented.

[0019] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a measuring device, including a signal source, an NV center detection device, and the modulation and demodulation device provided in the embodiment of the first aspect of the present invention.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0021] Figure 1It is a schematic diagram of a modulation and demodulation device according to an embodiment of the present invention;

[0022] Figure 2(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;

[0023] Figure 2(b) is an enlarged schematic diagram of area A in Figure 2(a);

[0024] Figure 3(a) is a schematic diagram of the absorption peak of the NV color center under low-power microwave driving according to an embodiment of the present invention;

[0025] Figure 3(b) is a schematic diagram of the frequency spectrum distribution of the NV fluorescence signal under low-power microwave driving according to an embodiment of the present invention;

[0026] Figure 4(a) is a schematic diagram of the absorption peak of the NV color center under high-power microwave driving according to an embodiment of the present invention;

[0027] Figure 4(b) is a schematic diagram of the frequency spectrum distribution of the NV fluorescence signal under high-power microwave driving according to an embodiment of the present invention;

[0028] Figure 5 It is a schematic diagram of a modulation and demodulation device according to a specific embodiment of the present invention;

[0029] Figure 6 It is a flowchart of a modulation and demodulation method according to an embodiment of the present invention;

[0030] Figure 7 It is a structural block diagram of an electronic device according to an embodiment of the present invention;

[0031] Figure 8 It is a schematic diagram of a measuring device according to an embodiment of the present invention. Detailed Description of the Specific Embodiment

[0032] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0033] It should be noted that the function realization 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 perspective of the modulation and demodulation principle, the bandwidth of the NV color center magnetic sensor cannot exceed 1 / 2 of the modulation frequency and is usually estimated at 1 / 10 of the modulation frequency, within which the frequency response has a relatively high flatness. Theoretical analysis and experimental research show that the effective signal amplitude of the NV color center magnetic sensor is approximately inversely proportional to the modulation frequency. An excessively high modulation frequency will reduce the effective signal amplitude, resulting in a decrease in magnetic measurement accuracy. Experimentally, the modulation frequency is generally selected within the range of 1 kHz to 30 kHz. Therefore, the bandwidth of the NV color center magnetic sensor generally does not exceed 3 kHz and is usually set below 1 kHz.

[0034] According to grid specifications, current transformers used for current measurement should achieve a measurement bandwidth of more than 3 kHz, and some high-performance current sensors need to achieve a measurement capability of more than 10 kHz. This poses relatively high requirements for the NV color center system.

[0035] In related power grid systems, current transformers need to undertake part of the protection function, disconnect the power grid system in a timely manner when a large current appears, and protect the sensitive units of the power grid. This requires the current transformer to have a relatively high response speed and also poses relatively high requirements for the magnetic measurement bandwidth.

[0036] In this context, the problem of improving the bandwidth of the NV color center magnetic sensor becomes very important. In related technologies, the solutions for improving the NV color center bandwidth include the following two, but both are accompanied by unacceptable negative effects. Among them, Solution 1: Abandon the modulation and demodulation scheme 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 an obvious multi-valued response problem appears. Solution 2: Retain the modulation and demodulation scheme, but significantly increase the modulation and demodulation frequency. This can maximize the bandwidth within the framework of the modulation and demodulation principle, but the amplitude of increasing the modulation and demodulation frequency is limited, and it will reduce the signal amplitude and lead to a decrease in the accuracy of current measurement. From the perspective of the system, this will also increase the data volume of the system, require faster analog-to-digital conversion acquisition, a larger data processing system, and higher power consumption, and will cause greater problems at the system reliability level.

[0037] To solve the above problems, the embodiments of the present invention provide a modulation and demodulation device, method, electronic device, and measurement device. The modulation and demodulation device, method, electronic device, and measurement device of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0038] Figure 1 It is a schematic diagram of a modulation and demodulation device according to an embodiment of the present invention. As Figure 1 shown, the modulation and demodulation device may include:

[0039] A modulation and demodulation module, connected to a signal source and an NV center detection device, is configured to perform modulation and demodulation processing on the fluorescence signal generated by the NV center detection device based on a reference signal with a modulation frequency generated by the signal source, and extract harmonic signals of the magnetic field frequency to be measured and / or the second harmonic of the magnetic field to be measured in the fluorescence signal, so as 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 center detection device for detecting the magnetic field to be measured based on the reference signal with the modulation frequency generated by the signal source;

[0040] A signal processing module, connected to the modulation and demodulation module, is configured 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 magnitude of the magnetic field to be measured according to the demodulation signal.

[0041] In the embodiment of the present invention, aiming at the bandwidth problem of the NV center, the bandwidth of the NV center is broadened from the perspective of signal processing.

[0042] Research shows that the NV center itself has a certain non-linear response behavior, and complex sidelobe signal peaks appear in the modulation and demodulation signals. Specifically, if the NV center has a strict theoretical response, the signal frequency spectrum distribution of the NV center magnetic sensor should satisfy the characteristics shown in Fig. 2(a), where Fig. 2(b) is an enlarged schematic diagram of region A in Fig. 2(a), that is, the fluorescence signal output by the NV center should have and main lobe signal peaks at two frequency points, where , , represents the modulation frequency of the reference signal generated by the signal source, represents the magnetic field frequency to be measured.

[0043] However, in actual operation, the non-linear 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 absorption peak of the NV center splits into three, and the shape of each absorption peak is close to the Lorentz line shape, as shown in Fig. 3(a). At this time, the fluorescence signal directly output by the NV center will generate non-linear harmonic signals at the position of the magnetic field frequency , as shown in Fig. 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 turn into Gaussian line shapes, and the width gradually increases until they merge into one absorption peak, as shown in Fig. 4(a). At this time, the fluorescence signal directly output by the NV center will generate non-linear harmonic signals at the second harmonic of the magnetic field frequency position, as shown in Fig. 4(b).

[0044] In the related phase-locked modulation and demodulation device, a multiplier and a low-pass filter are used to filter out non-linear harmonic signals, without affecting the demodulated signal output by the phase-locked modulation and demodulation device. Only the fluorescence signals located at and are retained as the output demodulated signal.

[0045] In an embodiment of the present invention, to broaden the bandwidth of the NV color center, the modulation and demodulation module is used to perform two-way or three-way processing on the fluorescence signals generated by the NV color center detection device respectively. The signal processing module adds and outputs the signals obtained after two-way or three-way processing to generate a demodulated signal, so as to generate the magnitude of the magnetic field to be measured or the magnitude of the current to be measured according to the demodulated signal.

[0046] Specifically, when the modulation and demodulation module performs two-way processing, one way of the modulation and demodulation module to process the fluorescence signal generated by the NV color center detection device is: performing modulation and demodulation processing on the fluorescence signal generated by the NV color center detection device for detecting the magnetic field to be measured based on the reference signal of the modulation frequency generated by the signal source to achieve the function of phase-locked modulation and demodulation. The other way is to extract the non-linear 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 non-linear harmonic signal of the second harmonic 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: performing modulation and demodulation processing on the fluorescence signal generated by the NV color center detection device for detecting the magnetic field to be measured based on the reference signal of the modulation frequency generated by the signal source. The other two ways are: extracting the non-linear harmonic signals of the fundamental frequency of the magnetic field to be measured (the frequency of the magnetic field to be measured) and the second harmonic frequency of the magnetic field to be measured in the fluorescence signal.

[0047] Performing an addition operation based on the first effective signal and the second effective signal to generate a demodulated signal. Or performing an addition operation on the first effective signal and the third effective signal to generate a demodulated signal. Or performing an addition operation based on the first effective signal, the second effective signal, and the third effective signal to generate a demodulated signal. According to the demodulated signal output by the modulation and demodulation device, the magnitude of the magnetic field to be measured can be determined. Among them, when detecting the current, the magnitude of the current can be determined according to the magnitude of the magnetic field to achieve the detection of the current.

[0048] The modulation and demodulation device of the embodiment of the present invention uses the modulation and demodulation module to perform multi-way processing on the fluorescence signals generated by the NV color center detection device respectively, and generates a demodulated signal based on the signal obtained by performing modulation and demodulation on 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 second harmonic 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.

[0049] In an embodiment of the present invention, as Figure 5As 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 with a target frequency based on a reference signal with a modulation frequency generated by a signal source. The NV color center diamond generates a change in fluorescence intensity under the action of the laser source based on the microwave signal with the target frequency generated by the microwave source and the magnetic field frequency of the magnetic field to be measured. 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).

[0050] In an embodiment of the present invention, as Figure 5 shown, the modulation and demodulation module may include:

[0051] A first link, connected to the signal source and the NV color center detection device, for modulating and demodulating the fluorescence signal based on the reference signal with the modulation frequency to obtain a first effective signal;

[0052] A second link, connected to the NV color center detection device, for extracting the harmonic signal of the magnetic field frequency to be measured in the fluorescence signal to obtain a second effective signal;

[0053] A third link, connected to the NV color center detection device, for extracting the harmonic signal of the second harmonic of the magnetic field to be measured in the fluorescence signal and performing a frequency division by two on the extracted harmonic signal to obtain a third effective signal.

[0054] The modulation and demodulation module in the embodiment of the present invention may include a first link, a second link, and a third link to perform multiplex processing on the fluorescence signal using the three links.

[0055] Among them, the first link is used to perform modulation and demodulation processing on the fluorescence signal generated by the NV color center detection device for detecting the magnetic field to be measured based on the reference signal with the modulation frequency generated by the signal source to obtain a first effective signal, realizing the function of phase-locked modulation and demodulation. The second link extracts the non-linear harmonic signal of the fundamental frequency (magnetic field frequency to be measured) of the magnetic field to be measured in the fluorescence signal to obtain a second effective signal. The third link extracts the non-linear harmonic signal of the second harmonic of the magnetic field to be measured in the fluorescence signal and performs a frequency division by two on the extracted harmonic signal to obtain a third effective signal.

[0056] In an embodiment of the present invention, as Figure 5 shown, the first link may include:

[0057] A digital multiplier, the first input terminal of the digital multiplier is connected to the output terminal of the signal source, and the second input terminal of the digital multiplier is connected to the output terminal of the NV color center detection device, for mixing the reference signal with the modulation frequency and the fluorescence signal to generate a first signal with the magnetic field frequency to be measured and a second frequency, where the second frequency is greater than the magnetic field frequency to be measured;

[0058] The first filter, the input end of the first filter is connected to the output end of the digital multiplier, and is used to filter out the high-frequency components of the first signal to obtain the first effective signal.

[0059] 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 half of the modulation frequency . It should be noted that the embodiments of the present invention do not limit the cut-off frequency of the digital low-pass filter.

[0060] Specifically, the digital multiplier mixes the reference signal and the fluorescence signal of the modulation frequency to generate a first signal of the frequency of the magnetic field to be measured and a second frequency . The first filter filters out the high-frequency components in the first signal, that is, filters out the components of the second frequency in the first signal, and obtains the first effective signal of the frequency of the magnetic field to be measured .

[0061] In an embodiment of the present invention, as Figure 5 shown, the second link may include:

[0062] The second filter, the 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 components in the fluorescence signal to obtain the second effective signal.

[0063] 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 half of the modulation frequency . It should be noted that the embodiments of the present invention do not limit the cut-off frequency of the digital high-pass filter.

[0064] 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, so as to isolate the relatively large low-frequency noise on this link and avoid affecting the magnetic measurement accuracy.

[0065] In an embodiment of the present invention, as Figure 5 shown, the third link includes:

[0066] The 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 components in the fluorescence signal to obtain a third signal of the second harmonic frequency of the magnetic field to be measured;

[0067] The digital frequency divider circuit, the input end of the digital frequency divider circuit is connected to the output end of the third filter, and is used to perform frequency division by two on the third signal to generate a third effective signal.

[0068] 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.

[0069] 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.

[0070] In one embodiment of the present invention, Figure 5 As shown, the signal processing module includes:

[0071] 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.

[0072] 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.

[0073] In one embodiment of the present invention, Figure 5 As shown, the modem device may include:

[0074] 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;

[0075] 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;

[0076] 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.

[0077] 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.

[0078] In the modulation and demodulation device according to the embodiment of the present invention, through the combination of different links, by utilizing the high bandwidth characteristics of the fundamental frequency of the magnetic field to be measured and the second harmonic frequency of the magnetic field to be measured, the bandwidth of magnetic measurement is improved to meet the requirements of high-frequency magnetic field measurement.

[0079] In the modulation and demodulation device according to the embodiment of the present invention, a high-pass filter is added to the fundamental frequency link of the magnetic field to be measured and the second harmonic frequency link of the magnetic field to be measured to reduce the influence of relatively severe low-frequency noise in the link on the system, and ensure that the entire magnetic measurement system has high magnetic measurement sensitivity.

[0080] In the modulation and demodulation device according to the embodiment of the present invention, by adjusting the gains and phases of the three links, the differences in amplitude response and delay in different links are compensated to improve the flatness of the frequency response at the system level.

[0081] The present invention provides a modulation and demodulation method.

[0082] The modulation and demodulation method according to the embodiment of the present invention is used for an NV color center detection device. The NV color center detection device detects the magnetic field to be measured based on a reference signal with a modulation frequency generated by a signal source and generates a fluorescence signal.

[0083] Figure 6 It is a flowchart of the modulation and demodulation method according to an embodiment of the present invention. As Figure 6 shown, the modulation and demodulation method may include:

[0084] S101, performing modulation and demodulation processing on the fluorescence signal based on the reference signal with the modulation frequency, and extracting the harmonic signals of the frequency of the magnetic field to be measured and / or the second harmonic 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;

[0085] S102, generating a demodulation signal according to the first effective signal and the second effective signal and / or the third effective signal to determine the magnitude of the magnetic field of the magnetic field to be measured according to the demodulation signal.

[0086] In the embodiment of the present invention, to broaden the bandwidth of the NV color center, the fluorescence signal generated by the NV color center detection device is respectively processed in two or three paths, and the signal processing module adds and outputs the signals obtained after the two or three paths of processing to generate a demodulation signal, so as to generate the magnitude of the magnetic field of the magnetic field to be measured or the magnitude of the current of the current to be measured according to the demodulation signal.

[0087] In an embodiment of the present invention, performing modulation and demodulation processing on the fluorescence signal based on the reference signal with the modulation frequency may include: mixing the reference signal with the modulation frequency and the fluorescence signal to generate a first signal of the frequency of the magnetic field to be measured and a second frequency, where the second frequency is greater than the frequency of the magnetic field to be measured; filtering out the high-frequency components of the first signal to obtain a first effective signal.

[0088] In one embodiment of the present invention, the extraction process of the harmonic signal of the magnetic field frequency to be measured in the fluorescence signal may include: filtering out the low-frequency components in the fluorescence signal to obtain a second effective signal.

[0089] In one embodiment of the present invention, the extraction process of the harmonic signal of the second harmonic of the magnetic field to be measured in the fluorescence signal may include: filtering out the low-frequency components in the fluorescence signal to obtain a third signal of the second harmonic of the magnetic field to be measured; performing a frequency division by two on the third signal to generate a third effective signal.

[0090] In one embodiment of the present invention, generating a demodulation signal based on the first effective signal and the second effective signal and / or the third effective signal may include: performing an addition operation on the first effective signal, the second effective signal, and / or the third effective signal to obtain the demodulation signal.

[0091] Before generating a demodulation signal based on the first effective signal and the second effective signal and / or the third effective signal in one embodiment of the present invention, the method further includes: performing gain and phase adjustment processing on the first effective signal and the second effective signal and / or the third effective signal.

[0092] It should be noted that for other specific embodiments of the modulation and demodulation method provided in the embodiments of the present invention, reference may be made to other specific embodiments of the modulation and demodulation device in the above embodiments of the present invention.

[0093] The modulation and demodulation method according to the embodiments of the present invention, through the combination of different links, utilizes the high bandwidth characteristics of the fundamental frequency of the magnetic field to be measured and the second harmonic of the magnetic field to be measured to improve the bandwidth of magnetic measurement and meet the requirements of high-frequency magnetic field measurement.

[0094] The present invention provides an electronic device.

[0095] In this embodiment, the electronic device may include a memory and a processor. A computer program is stored on the memory. It is characterized in that when the computer program is executed by the processor, the above-mentioned modulation and demodulation method is implemented.

[0096] Figure 7 It is a structural block diagram of the electronic device according to the embodiment of the present invention.

[0097] As Figure 7 shown, the electronic device 500 includes: a processor 501 and a memory 503. Among them, the processor 501 and the memory 503 are connected, such as connected through a bus 502. Optionally, the electronic device 500 may further include a transceiver 504. It should be noted that in practical applications, the transceiver 504 is not limited to one, and the structure of the electronic device 500 does not constitute a limitation to the embodiments of the present invention.

[0098] 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 can implement or execute various exemplary logical blocks, modules, and circuits described in connection 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, and the like.

[0099] The bus 502 may include a path for transmitting information between the above components. The bus 502 may be a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 502 may be divided into an address bus, a data bus, a control bus, etc. For the sake of representation, Figure 7 only a thick line is shown herein, but it does not mean that there is only one bus or one type of bus.

[0100] The memory 503 is used to store a computer program corresponding to the modulation and demodulation method of the above embodiments of the present invention, and the execution of this computer program is controlled 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 foregoing method embodiments.

[0101] Among them, the electronic device 500 includes but is not limited to: mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), PMPs (Portable Multimedia Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The illustrated electronic device 500 is only an example and should not impose any limitation on the functions and scope of use of the embodiments of the present invention.

[0102] The present invention provides a measuring device.

[0103] Figure 8 is a schematic diagram of a measuring device according to an embodiment of the present invention. As Figure 8As shown, the measurement device may include a signal source 100, an NV color center detection device 200, and a modulation and demodulation device 300 as described above.

[0104] The electronic device and the measurement device in the embodiments of the present invention can be used in fields such as low-frequency geomagnetic measurement and high-frequency current measurement. The embodiments of the present invention do not limit the application fields of the electronic device and the measurement device.

[0105] The electronic device and the measurement device in the embodiments of the present invention can measure high-frequency magnetic fields.

[0106] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence 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, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. 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 diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or other appropriate processing as necessary, and then stored in a computer memory.

[0107] It should be understood that the various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0108] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0109] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0110] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0111] In the present invention, unless otherwise clearly specified and defined, terms such as "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0112] In the present invention, unless otherwise clearly specified or limited, a first feature being "on" or "under" 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 via an intermediate medium. Further, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0113] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A modulation and demodulation device, characterized in that, The device includes: A modulation and demodulation module, connected to a signal source and an NV center detection device, for performing modulation and demodulation processing on the fluorescence signal generated by the NV center detection device based on a reference signal with a modulation frequency generated by the signal source, to obtain a first effective signal, and for extracting harmonic signals of the magnetic field frequency to be measured and the second harmonic of the magnetic field frequency to be measured in the fluorescence signal, to obtain a second effective signal and a third effective signal, where the fluorescence signal is generated by the NV center detection device for detecting the magnetic field to be measured based on the reference signal with the modulation frequency generated by the signal source; A signal processing module, connected to the modulation and demodulation module, for generating a demodulation signal according to the first effective signal, the second effective signal, and the third effective signal, to determine the magnitude 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 includes: A first link, connected to the signal source and the NV center detection device, for performing modulation and demodulation processing on the fluorescence signal based on the reference signal with the modulation frequency, to obtain the first effective signal; A second link, connected to the NV center detection device, for extracting the harmonic signal of the magnetic field frequency to be measured in the fluorescence signal, to obtain the second effective signal; A third link, connected to the NV center detection device, for extracting the harmonic signal of the second harmonic of the magnetic field frequency to be measured in the fluorescence signal, and for performing a frequency division by two 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 includes: A digital multiplier, the first input terminal of the digital multiplier is connected to the output terminal of the signal source, and the second input terminal of the digital multiplier is connected to the output terminal of the NV center detection device, for mixing the reference signal with the modulation frequency and the fluorescence signal, to generate a first signal with the magnetic field frequency to be measured and a second frequency, where the second frequency is greater than the magnetic field frequency to be measured; A first filter, the input terminal of the first filter is connected to the output terminal of the digital multiplier, for filtering out the high-frequency components of the first signal, to obtain the first effective signal.

4. The modulation and demodulation device according to claim 2, wherein The second link includes: A second filter, the first end of the second filter is connected to the output terminal of the NV center detection device, for filtering out the low-frequency components in the fluorescence signal, to obtain the second effective signal.

5. The modulation and demodulation device according to claim 2, wherein The third link includes: A third filter, the input terminal of the third filter is connected to the output terminal of the NV center detection device, for filtering out the low-frequency components in the fluorescence signal, to obtain a third signal with the second harmonic of the magnetic field frequency to be measured; A digital frequency division by two circuit, the input terminal of the digital frequency division by two circuit is connected to the output terminal of the third filter, for performing a frequency division by two on the third signal, to generate the third effective signal.

6. The modulation and demodulation device according to any one of claims 3-5, characterized in that 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 frequency divider circuit, and is configured to perform an addition operation on the first valid signal, the second valid signal, and the third valid signal to obtain the demodulation signal.

7. The modulation and demodulation device according to claim 6, characterized in that, The device includes: A first gain and phase adjustment module, connected between the digital adder and the first filter, and configured to compensate for the amplitude response and delay difference of the first valid signal; A second gain and phase adjustment module, connected between the digital adder and the second filter, and configured to compensate for the amplitude response and delay difference of the second valid signal; A third gain and phase adjustment module, connected between the digital adder and the digital frequency divider circuit, and configured to compensate for the amplitude response and delay difference of the third valid 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 and generates a fluorescence signal. The method includes: Performing modulation and demodulation processing on the fluorescence signal based on the reference signal of the modulation frequency to obtain a first valid signal, and performing extraction processing on harmonic signals of the magnetic field frequency to be measured and the second harmonic of the magnetic field to be measured in the fluorescence signal to obtain a second valid signal and a third valid signal; Generating a demodulation signal according to the first valid signal, the second valid signal, and the third valid signal, so as to determine the 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 on the memory, characterized in that, When the computer program is executed by the processor, the modulation and demodulation method described in claim 8 is implemented.

10. A measuring device, characterized in that, Including a signal source, an NV color center detection device, and a modulation and demodulation device according to any one of claims 1-7.

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