Laser noise reduction system based on diamond NV color center, control method and equipment

Abstract

The invention relates to the field of magnetic field intensity measurement, and discloses a laser noise reduction system based on a diamond NV color center, a control method and equipment. According to the laser noise reduction system based on the diamond NV color center, by adjusting the resistance value of a resistor in a circuit, the optimal correlation coefficient value of laser correlation noise reduction is obtained, the situation that errors are caused by adjustment of an optical path structure is avoided, the difficulty of debugging correlation coefficients is effectively reduced, and a low-noise magnetic measurement signal can be further output; and the test time cost and the production cost for outputting the low-noise magnetic measurement signal are effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the field of magnetic field strength measurement, and particularly relates to a laser noise reduction system based on diamond NV centers, a control method for a laser noise reduction system based on diamond NV centers, and an electronic device. Background Art

[0002] When measuring the magnetic field strength, the magnetic measurement efficiency can be improved by using an NV center magnetic sensor. In practical applications, laser noise has a great influence on the magnetic measurement sensitivity of the NV center magnetic sensor. To solve the interference of laser noise, most related technologies adopt relevant noise reduction methods to eliminate the noise introduced by the laser, describe the correlation between fluorescence noise and laser noise through the linear correlation coefficient, and further calculate the optimal value of the correlation coefficient to achieve the best noise reduction effect.

[0003] However, in related technologies, the system debugging of the control scheme for the correlation coefficient between fluorescence noise and laser noise is difficult, and the key parameters of the regulation need to be debugged. The regulation effect of the key parameters directly affects the final sensitivity, and repeated debugging is required, resulting in low debugging efficiency, which in turn affects the test time and production cost. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a laser noise reduction system based on diamond NV centers, which can simplify the debugging process of obtaining the optimal solution of the noise reduction correlation coefficient through an analog circuit to achieve the best noise reduction effect.

[0005] In a first aspect, an embodiment of the present invention provides a laser noise reduction system based on diamond NV centers, including: a first photoelectric conversion circuit, sequentially connected in series with a fluorescence detector and a first amplifier. The light source inlet of the fluorescence detector is disposed opposite to the diamond NV center, and is used to receive the first fluorescence and detect a fluorescence signal from the first fluorescence, and convert the fluorescence signal into a first current signal; the first amplifier is used to perform operational amplification on the first current signal to obtain a first voltage signal; a second photoelectric conversion circuit, sequentially connected in series with a laser detector and a second amplifier. The light source inlet of the laser detector is disposed opposite to the second prism surface of the beam splitter device, and is used to receive the second split light and detect a laser signal from the second split light, and convert the laser signal into a second current signal; the second amplifier is used to perform operational amplification on the second current signal to obtain a second voltage signal; an amplification circuit, including an operational amplifier device, and the operational amplifier device is used to output a noise reduction voltage at the operational amplifier output terminal according to the first voltage signal, the second voltage signal, and the target correlation coefficient; wherein, the target correlation coefficient is obtained when the noise signal of the noise reduction voltage is the smallest.

[0006] In some embodiments, the laser noise reduction system based on diamond NV color centers further includes a laser light source for emitting initial laser light.

[0007] In some embodiments, the beam splitting device of the laser noise reduction system based on diamond NV color centers further includes a first prism surface and a second prism surface. The beam splitting device is used to split the initial laser light into a first split light and a second split light; wherein, the first split light exits perpendicularly through the first prism surface, and the second split light exits perpendicularly through the second prism surface.

[0008] In some embodiments, the laser noise reduction system based on diamond NV color centers further includes a diamond NV color center, which is disposed opposite to the first prism surface and is used to receive the first split light exiting from the first prism surface and convert the first split light into first fluorescence.

[0009] In some embodiments, the operational amplifier device includes an inverting input terminal, a non-inverting input terminal, and an operational amplifier output terminal. The inverting input terminal is connected to the output terminal of the first optoelectronic conversion circuit and is used to receive a first voltage signal. The non-inverting input terminal is connected to the output terminal of the second optoelectronic conversion circuit and is used to receive a second voltage signal.

[0010] In some embodiments, the first amplifier includes a first non-inverting input terminal, a first inverting input terminal, and a first output terminal; the second amplifier includes a second non-inverting input terminal, a second inverting input terminal, and a second output terminal; the first non-inverting input terminal is grounded; the first inverting input terminal is connected to the output terminal of the fluorescence detector and is used to receive a first current signal; the first inverting input terminal is connected to the first output terminal, and a first resistor is disposed between the first inverting input terminal and the first output terminal; the second non-inverting input terminal is grounded; the second inverting input terminal is connected to the output terminal of the laser detector and is used to receive a second current signal; the second inverting input terminal is connected to the second output terminal, and a second resistor is disposed between the second inverting input terminal and the second output terminal.

[0011] In some embodiments, the first output terminal is connected to the inverting input terminal, and a third resistor is disposed between the first output terminal and the inverting input terminal; the second output terminal is connected to the non-inverting input terminal, and a fourth resistor is disposed between the second output terminal and the non-inverting input terminal.

[0012] In some embodiments, the inverting input terminal is connected to the operational amplifier output terminal, and a fifth resistor is disposed between the inverting input terminal and the operational amplifier output terminal; the non-inverting input terminal is grounded, and a sixth resistor is disposed between the non-inverting input terminal and the ground terminal.

[0013] In some embodiments, a seventh resistor is provided in the first optoelectronic conversion circuit, and an eighth resistor is provided in the second optoelectronic conversion circuit.

[0014] In some embodiments, the first amplifier includes a third non-inverting input terminal, a third inverting input terminal, and a third output terminal; the second amplifier includes a fourth non-inverting input terminal, a fourth inverting input terminal, and a fourth output terminal; the third non-inverting input terminal and the third inverting input terminal are grounded, and a ninth resistor is provided between the third non-inverting input terminal and the third inverting input terminal and the ground terminal; the third non-inverting input terminal is connected to the output terminal of the fluorescence detector for receiving a first current signal; the third inverting input terminal is connected to the third output terminal, and a tenth resistor is provided between the third inverting input terminal and the third output terminal; the fourth non-inverting input terminal and the fourth inverting input terminal are grounded, and an eleventh resistor is provided between the fourth non-inverting input terminal and the fourth inverting input terminal and the ground terminal; the fourth non-inverting input terminal is connected to the output terminal of the laser detector for receiving a second current signal; the fourth inverting input terminal is connected to the fourth output terminal, and a twelfth resistor is provided between the fourth inverting input terminal and the fourth output terminal; the third output terminal is connected to the inverting input terminal; the fourth output terminal is connected to the non-inverting input terminal.

[0015] In some embodiments, the operational amplifier device further includes a first gain terminal, a second gain terminal, and a ground pin; a gain resistor is provided between the first gain terminal and the second gain terminal, and the gain resistor is used to adjust the gain value of the operational amplifier of the operational amplifier device; the ground pin is grounded.

[0016] The laser noise reduction system based on diamond NV centers according to the embodiments of the present invention can adjust the resistance values in the circuit to obtain the best correlation coefficient value for laser-related noise reduction, avoid the situation of errors caused by adjusting the optical path structure, effectively reduce the difficulty of debugging the correlation coefficient, and can further output a low-noise magnetic measurement signal, effectively reducing the test time cost and production cost of outputting a low-noise magnetic measurement signal.

[0017] In a second aspect, an embodiment of the present invention provides a control method for a laser noise reduction system based on diamond NV centers, which is applied to the laser noise reduction system based on diamond NV centers provided in the above embodiments, and includes: obtaining the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor; determining a target correlation coefficient according to the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor; adjusting the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor according to the target correlation coefficient;

[0018] Wherein, the target correlation coefficient is expressed as:

[0019]

[0020] Wherein, And where all are correlation coefficients, I1 is the first current signal, I2 is the second current signal, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, R4 is the resistance value of the fourth resistor, R5 is the resistance value of the fifth resistor, and R6 is the resistance value of the sixth resistor.

[0021] In some embodiments, the control method of the laser noise reduction system based on diamond NV color centers further includes: obtaining the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor; determining a target correlation coefficient according to the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor; and adjusting the resistance value of the gain resistor according to the target correlation coefficient.

[0022] where the target correlation coefficient is expressed as:

[0023]

[0024] where R REF is the resistance value of the gain reference resistor built in the operational amplifier device, is the correlation coefficient, I1 is the first current signal, I2 is the second current signal, R7 is the resistance value of the seventh resistor, R8 is the resistance value of the eighth resistor, R9 is the resistance value of the ninth resistor, R 10 is the resistance value of the tenth resistor, R 11 is the resistance value of the eleventh resistor, R 12 is the resistance value of the twelfth resistor.

[0025] According to the control method of the laser noise reduction system based on diamond NV color centers in the embodiments of the present invention, it is possible to adjust the resistance values in the circuit to obtain the optimal correlation coefficient value for laser-related noise reduction, avoid the situation of causing errors by adjusting the optical path structure, effectively reduce the difficulty of debugging the correlation coefficient, and further output a low-noise magnetic measurement signal, effectively reducing the test time cost and production cost of outputting a low-noise magnetic measurement signal.

[0026] In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of the control method of the laser noise reduction system based on diamond NV color centers as described above when executing the program.

[0027] An electronic device according to an embodiment of the present invention, when executing a control method of a laser noise reduction system based on a diamond NV color center, can adjust the resistance value in the circuit to obtain the optimal correlation coefficient value for laser-related noise reduction, avoiding the situation of causing errors by adjusting the optical path structure, effectively reducing the difficulty of debugging the correlation coefficient, and can further output a low-noise magnetic measurement signal, effectively reducing the test time cost and production cost of outputting a low-noise magnetic measurement signal.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 is a circuit schematic diagram of a laser noise reduction system based on a diamond NV color center provided by the present invention;

[0031] Figure 2 is a circuit schematic diagram of a specific laser noise reduction system based on a diamond NV color center provided by an embodiment of the present invention;

[0032] Figure 3 is a circuit schematic diagram of another specific laser noise reduction system based on a diamond NV color center provided by an embodiment of the present invention;

[0033] Figure 4 is a flowchart of a control method of a laser noise reduction system based on a diamond NV color center provided by an embodiment of the present invention;

[0034] Figure 5 is a flowchart of another control method of a laser noise reduction system based on a diamond NV color center provided by an embodiment of the present invention;

[0035] Figure 6 is a more specific schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention.

[0036] Reference numerals: 1 - laser light source; 2 - beam splitting device; 21 - first prism surface; 22 - second prism surface; 3 - diamond NV color center; 4 - first photoelectric conversion circuit; A1 - first amplifier; PD1 - fluorescence detector; R1 - first resistor; A11 - first non-inverting input terminal; A12 - first inverting input terminal; A13 - first output terminal; R7 - seventh resistor; R9 - ninth resistor; R10 - tenth resistor; A14 - third non-inverting input terminal; A15 - third inverting input terminal; A16 - third output terminal; 5 - second photoelectric conversion circuit; A2 - second amplifier; PD2 - laser detector; R2 - second resistor; A21 - second non-inverting input terminal; A22 - second inverting input terminal; A23 - second output terminal; R8 - eighth resistor; R11 - eleventh resistor; R12 - twelfth resistor; A24 - fourth non-inverting input terminal; A25 - fourth inverting input terminal; A26 - fourth output terminal; 6 - amplifier circuit; A3 - operational amplifier device; A31 - non-inverting input terminal; A32 - inverting input terminal; A33 - operational amplifier output terminal; R3 - third resistor; R4 - fourth resistor; R5 - fifth resistor; R6 - sixth resistor; Rz - gain resistor; A34 - first gain terminal; A35 - second gain terminal; A36 - ground pin; 610 - processor; 620 - memory; 630 - input / output interface; 640 - communication interface; 650 - bus. Detailed implementation mode

[0037] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0038] It should be understood that the steps recited in the method embodiments of the present invention can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0039] As described in the background art section, the NV color center is a luminescent point defect in diamond: a nitrogen atom in this defect point replaces a carbon atom in diamond, and there is a vacancy in the adjacent position. The NV color center can measure the magnetic field strength by electron paramagnetic resonance, regulate the spin state with microwaves, map the magnetic field strength to the fluorescence intensity or microwave resonance frequency change, and calculate the magnetic field strength by determining the microwave resonance frequency and fluorescence intensity on the NV color center, realizing high-precision magnetic field measurement.

[0040] The NV color center magnetic sensor has ultra-high sensitivity, with its sensitivity reaching 30 pT / Sqrt(Hz). On this basis, by leveraging the amplification effect of the magnetic concentrator, an ultra-high sensitivity of 200 fT / Sqrt(Hz) can be achieved, enabling it to measure even weaker magnetic field signals.

[0041] During the implementation of the embodiments of the present invention, the applicant found that when the NV color center magnetic sensor is actually used, since the magnetic measurement of the NV color center depends on three steps: laser excitation - microwave manipulation - fluorescence reading, and the laser emitted by the solid-state laser diode has relatively large noise, it will have a greater impact on the magnetic measurement sensitivity of the NV color center magnetic sensor.

[0042] To address the impact of laser noise on the NV color center magnetic sensor, relevant noise reduction methods are adopted in related technologies to eliminate laser noise: by assuming that the fluorescence noise introduced by laser power fluctuations has a linear correlation with its own fluctuations, that is, the part of the fluorescence noise caused by laser fluctuations can be quantitatively characterized by the linear correlation coefficient. Based on this correlation, the laser noise component can be deducted proportionally from the fluorescence signal by measuring the laser fluctuation intensity, thereby eliminating its interference with magnetic field measurement.

[0043] The above linear correlation between the fluorescence signal and laser noise can be further described by the following formula:

[0044] fluo_noise(t) = fluo(t) + fac × laser_noise(t)

[0045] Where, fluo_noise(t) represents the detected fluorescence signal, which contains magnetic field information and laser-introduced noise; fluo(t) represents the change in the fluorescence signal; laser_noise(t) represents the laser noise; and fac is the linear correlation coefficient.

[0046] By splitting the beam to measure the laser intensity, the calculation formula for deducting the noise proportionally is:

[0047] fluo_sig(t) = fluo_noise(t) - fac_eval × laser(t)

[0048] Where, fluo_sig(t) represents the signal intensity after noise reduction; laser(t) represents the intensity of the laser noise split proportionally, satisfying: laser(t) = N × laser_noise(t), where N is the splitting ratio; and fac_eval represents the correlation coefficient of relevant noise reduction, which can control the effect of relevant noise reduction.

[0049] Furthermore, according to the above formula, it can be known that if the relationship between the correlation coefficient fac_eval of relevant noise reduction and the linear correlation coefficient fac satisfies:

[0050]

[0051] At this time, the influence of the laser noise laser_noise(t) on the NV color center is approximately zero, that is, the best relevant noise reduction effect is achieved.

[0052] To obtain the optimal value of the correlation coefficient for relevant noise reduction, in related technologies, a balanced optoelectronic scheme or a dual-channel phase-locked scheme is often used for multiple experiments: The balanced optoelectronic scheme needs to utilize the internal structure of the balanced optoelectronic detector to remove noise; the dual-channel phase-locked scheme needs to connect two optoelectronic detectors to the phase-locked amplifier simultaneously for signal demodulation, and perform relevant noise reduction on the two demodulated signals. However, both the balanced optoelectronic scheme and the dual-channel phase-locked scheme need to adjust the laser optical path through the polarization adjustment optical path during the experiment, and the adjustment of the polarization adjustment optical path is difficult, and its adjustment effect will directly affect the experimental results, which may lead to deviations in the results, and further affect the magnetic measurement sensitivity of the final NV color center magnetic sensor.

[0053] Therefore, the applicant provides a technical solution that can achieve the best adjustment of the relevant noise reduction effect based on an analog circuit. The following further details the laser noise reduction system based on diamond NV color centers provided by the present invention through specific embodiments.

[0054] Reference Figure 1 , is a circuit schematic diagram of the laser noise reduction system based on diamond NV color centers provided by the present invention.

[0055] Specifically, the laser noise reduction system based on diamond NV color center 3 provided by the present invention includes: a laser light source 1, a beam splitting device 2, a diamond NV color center 3, a first optoelectronic conversion circuit 4, a second optoelectronic conversion circuit 5, and an amplification circuit 6.

[0056] The laser light source 1 is used to provide the initial laser for the system. In the present invention, the laser light source 1 can be a solid-state laser diode. The solid-state laser diode has a high integration degree and a miniaturized design, can achieve chip-level packaging, can greatly reduce the volume of the device, and is convenient for portable applications; at the same time, it has a fast modulation ability, can support dynamic magnetic field measurement and high-precision timing synchronization, and ensures the accuracy of magnetic measurement; in addition, the solid-state laser diode also has the advantages of low cost and high lifespan, and can also be applied to industrial production.

[0057] The beam splitting device 2 is preferably a beam splitting prism in the present invention. The beam splitting prism is an optical element that divides the incident light beam into two or more light beams according to a specific ratio by using optical thin films or polarization characteristics. The beam splitting prism realizes the splitting of the optical path by partially reflecting or transmitting the light beam at the interface through a coating layer (such as a semi-transparent semi-reflective film) or polarization beam splitting technology (such as a polarization beam splitting prism).

[0058] In the present invention, the beam splitting device 2 includes a first prism surface 21 and a second prism surface 22, and can decompose the initial laser emitted by the laser light source 1 into a first split light and a second split light. Among them, the first split light is perpendicularly emitted from the first prism surface 21, and the second split light is perpendicularly emitted from the second prism surface 22.

[0059] The diamond NV color center 3 is disposed opposite to the first prism surface 21, and can receive the first split light perpendicularly emitted from the first prism surface 21, and further convert the first split light into a first fluorescence.

[0060] Reference Figure 2 , which is a schematic circuit diagram of a specific laser noise reduction system based on diamond NV color centers provided by an embodiment of the present invention.

[0061] The first photoelectric conversion circuit 4 includes a fluorescence detector PD1, a first amplifier A1, and a first resistor R1.

[0062] The fluorescence detector PD1 can be a common photomultiplier tube (PMT), avalanche photodiode (APD), or single photon counter (SPAD), etc. By using a dichroic mirror or a band-pass filter, the passage of other light sources (such as lasers, etc.) is blocked, and only fluorescence is allowed to pass through, so as to collect the fluorescence and further convert the optical signal into an electrical signal according to the photoelectric effect.

[0063] The light source inlet of the fluorescence detector PD1 is disposed opposite to the diamond NV color center 3, and can receive the first fluorescence converted by the diamond NV color center 3, extract the fluorescence signal in the first fluorescence, and further convert the fluorescence signal into a first current signal;

[0064] The first amplifier A1 includes a first non-inverting input terminal A11, a first inverting input terminal A12, and a first output terminal A13. Among them, the first non-inverting input terminal A11 is grounded, the first inverting input terminal A12 is connected to the output terminal of the fluorescence detector PD1, can receive the first current signal and input it to the first amplifier A1 for operational amplification, obtain a first voltage signal and output it from the first output terminal A13; the first inverting input terminal A12 is also connected to the first output terminal A13 through the first resistor R1 to form negative feedback to set the gain of the first photoelectric conversion circuit 4. If the first current signal at this time is I1 and the resistance value of the first resistor R1 is R1, then according to the "virtual short" and "virtual open" characteristics of operational amplification, the first voltage signal output from the first output terminal A13 at this time is V A1 =-I1×R1.

[0065] The second photoelectric conversion circuit 5 includes a laser detector PD2, a second amplifier A2, and a second resistor R2.

[0066] The laser detector PD2 can be a photodiode (such as a PIN diode, an avalanche photodiode APD) or a photomultiplier tube (PMT). When a laser irradiates a photodiode (such as a PIN or APD), the energy of photons can excite electrons in the semiconductor, thereby generating a current (photocurrent).

[0067] Among them, the light source inlet of the laser detector PD2 is arranged opposite to the second prism surface 22, and can receive the second split light perpendicularly emitted from the second prism surface 22, extract the laser signal in the second split light, and further convert the laser signal into a second current signal;

[0068] The second amplifier A2 includes a second non-inverting input terminal A21, a second inverting input terminal A22, and a second output terminal A32. Among them, the second non-inverting input terminal A21 is grounded, the second inverting input terminal A22 is connected to the output terminal of the laser detector PD2, can receive the second current signal and input it to the second amplifier A2 for operational amplification, obtain a second voltage signal and output it from the second output terminal A32; the second inverting input terminal A22 is also connected to the second output terminal A32 through a second resistor R2 to form negative feedback to set the gain of the second photoelectric conversion circuit 5. If the second current signal at this time is I2 and the resistance value of the second resistor R2 is R2, then according to the "virtual short" and "virtual open" characteristics of the operational amplifier, the second voltage signal output from the second output terminal A32 at this time is V A2 =-I2×R2.

[0069] The amplification circuit 6 includes an operational amplifier device A3, and the operational amplifier device A3 includes an inverting input terminal A32, a non-inverting input terminal A31, and an operational amplifier output terminal A33.

[0070] Among them, the inverting input terminal A32 is connected to the output terminal of the first photoelectric conversion circuit 4, that is, the inverting input terminal A32 is connected to the first output terminal A13. The inverting input terminal A32 is used to receive the first voltage signal, and a third resistor R3 is arranged between the inverting input terminal A32 and the first output terminal A13; the non-inverting input terminal A31 is connected to the output terminal of the second photoelectric conversion circuit 5, that is, the non-inverting input terminal A31 is connected to the second output terminal A32. The non-inverting input terminal A31 is used to receive the second voltage signal, and a fourth resistor R4 is arranged between the non-inverting input terminal A31 and the second output terminal A32; the third resistor R3 and the fourth resistor R4 can jointly form a negative feedback network to set the gain of the amplification circuit 6 and stabilize the outputs of the first photoelectric conversion circuit 4 and the second photoelectric conversion circuit 5.

[0071] The inverting input terminal A32 is also connected to the operational amplifier output terminal A33 through a fifth resistor R5, and the non-inverting input terminal A31 is also connected to the ground terminal through a sixth resistor R6. The fifth resistor R5 and the sixth resistor R6 can jointly form a negative feedback network to set the gain of the amplification circuit 6.

[0072] Further, the operational amplifier device A3 outputs a noise reduction voltage at the operational amplifier output terminal A33 according to the first voltage signal, the second voltage signal, and the target correlation coefficient. At this time, the noise signal of the noise reduction voltage is minimized, that is, the laser noise is eliminated at this time, so as to avoid the influence of laser noise on the sensitivity of the NV color center.

[0073] Reference Figure 3 , which is a circuit schematic diagram of another specific laser noise reduction system based on diamond NV color centers provided by the embodiment of the present invention.

[0074] The first photoelectric conversion circuit 4 may further include a fluorescence detector PD1, a first amplifier A1, a seventh resistor R7, a ninth resistor R9, and a tenth resistor R10.

[0075] The light source inlet of the fluorescence detector PD1 is oppositely arranged with respect to the diamond NV color center 3, and the output end of the fluorescence detector PD1 is grounded through the seventh resistor R7.

[0076] The first amplifier A1 includes a third non-inverting input terminal A14, a third inverting input terminal A15, and a third output terminal A16.

[0077] The output end of the fluorescence detector PD1 is also connected to the third non-inverting input terminal A14 and can receive the first current signal; the third non-inverting input terminal A14 is connected to the third inverting input terminal A15 and is connected to the ground terminal through the ninth resistor R9; the third inverting input terminal A15 is also connected to the third output terminal A16 through the tenth resistor R10; the seventh resistor R7, the ninth resistor R9, and the tenth resistor R10 can jointly form a negative feedback network to set the gain of the first photoelectric conversion circuit 4. If the first current signal at this time is I1, the resistance value of the seventh resistor R7 is R7, the resistance value of the ninth resistor R9 is R9, and the resistance value of the tenth resistor R10 is R 10 , then according to the "virtual short" and "virtual open" characteristics of the operational amplifier, the first voltage signal output by the third output terminal A16 at this time is

[0078]

[0079] The second photoelectric conversion circuit 5 may further include a laser detector PD2, a second amplifier A2, an eighth resistor R8, an eleventh resistor R11, and a twelfth resistor R12.

[0080] The light source inlet of the laser detector PD2 is oppositely arranged with respect to the second prism surface 22, and the output end of the laser detector PD2 is grounded through the eighth resistor R8.

[0081] The second amplifier A2 includes a fourth non-inverting input terminal A24, a fourth inverting input terminal A25, and a fourth output terminal A26.

[0082] The output terminal of the laser detector PD2 is also connected to the fourth non-inverting input terminal A24, capable of receiving the second current signal; the fourth non-inverting input terminal A24 is connected to the fourth inverting input terminal A25 and is connected to the ground terminal through the eleventh resistor R11; the fourth inverting input terminal A25 is also connected to the fourth output terminal A26 through the twelfth resistor R12; the eighth resistor R8, the eleventh resistor R11, and the twelfth resistor R12 can jointly form a negative feedback network to set the gain of the second photoelectric conversion circuit 5. If the second current signal at this time is I2, the resistance value of the eighth resistor R8 is R8, and the resistance value of the eleventh resistor R11 is R 11 , and the resistance value of the twelfth resistor R12 is R 12 , then according to the "virtual short" and "virtual open" characteristics of the operational amplifier, the second voltage signal output by the fourth output terminal A26 at this time is

[0083] The third output terminal A16 is connected to the inverting input terminal A32 of the operational amplifier device A3 for inputting the first voltage signal to the operational amplifier device A3, and the fourth output terminal A26 is connected to the non-inverting input terminal A31 of the operational amplifier device A3 for inputting the second voltage signal to the operational amplifier device A3.

[0084] The operational amplifier device A3 further includes a first gain terminal A34 and a second gain terminal A35. A gain resistor Rz is provided between the first gain terminal A34 and the second gain terminal A35. The gain resistor Rz is used to adjust the gain value of the operational amplifier of the operational amplifier device A3, and the gain resistor Rz can also be used as a bias resistor to divide the voltage or limit the current of the amplifier circuit 6; the operational amplifier device A3 further includes a ground pin A36, and the ground pin A36 can stabilize the reference voltage, adjust the offset of the output terminal, suppress the common-mode noise, and further determine the gain of the amplifier circuit 6.

[0085] According to the laser noise reduction system based on diamond NV centers of the embodiments of the present invention, it is possible to adjust the resistance values in the circuit to obtain the best correlation coefficient value for laser-related noise reduction, avoid the situation of errors caused by adjusting the optical path structure, effectively reduce the difficulty of debugging the correlation coefficient, and can further output a low-noise magnetic measurement signal, effectively reducing the test cost and production cost of outputting a low-noise magnetic measurement signal.

[0086] Based on the same concept, corresponding to the laser noise reduction system based on diamond NV centers provided in any of the above embodiments, the present invention also provides a control method for the laser noise reduction system based on diamond NV centers.

[0087] Refer to Figure 4 , which is a flowchart of a control method for a laser noise reduction system based on diamond NV centers provided in an embodiment of the present invention.

[0088] Step S401: Obtain the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor.

[0089] Step S402: Determine the target correlation coefficient based on the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor.

[0090] Step S403: Adjust the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor according to the target correlation coefficient.

[0091] Specifically, when the laser light source is turned on, the initial laser light enters the beam splitter device and is split into a first split beam and a second split beam by the beam splitter device. The first split beam exits perpendicularly from the first prism surface of the beam splitter device, enters the diamond NV color center, is converted into first fluorescence by the diamond NV color center, and further irradiates the fluorescence detector; the second split beam exits perpendicularly from the second prism surface of the beam splitter device and further irradiates the laser detector.

[0092] The fluorescence detector converts the received first fluorescence into a fluorescence signal, and after converting the fluorescence signal into a first current signal I1, it inputs it to the first photoelectric conversion circuit. Further, obtain the resistance value R1 of the first resistor, and calculate the first voltage signal V after the first current signal I1 passes through the first amplifier according to the resistance value R1 of the first resistor A1 =-I1×R1; after the laser detector converts the received second split beam into a second current signal I2, it inputs it to the second photoelectric conversion circuit. Further, obtain the resistance value R2 of the second resistor, and calculate the second voltage signal V after the second current signal I2 passes through the second amplifier according to the resistance value R2 of the second resistor A2 =-I2×R2.

[0093] Further, input the first voltage signal V A1 and the second voltage signal V A2 to the amplifier circuit, obtain the resistance value R3 of the third resistor, the resistance value R4 of the fourth resistor, the resistance value R5 of the fifth resistor, and the resistance value R6 of the sixth resistor. According to the resistance value R3 of the third resistor, the resistance value R4 of the fourth resistor, the resistance value R5 of the fifth resistor, the resistance value R6 of the sixth resistor, and the first voltage signal V A1 and the second voltage signal V A2 obtain the output noise reduction voltage V out , where the calculation formula of the noise reduction voltage V out is:

[0094]

[0095] where, and All are correlation coefficients.

[0096] It can be seen that by adjusting the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor, the target correlation coefficient can be adjusted to obtain the optimal solution of the target correlation coefficient.

[0097] Bring the first voltage signal V A1 =-I1×R1 and the second voltage signal V A2 =-I2×R2 into the calculation formula of the noise reduction voltage V out , and it can be further obtained that:

[0098]

[0099] It can be seen that the optimal solution of the target correlation coefficient can be further obtained by adjusting the resistance values of the first resistor and the second resistor, and cooperating with adjusting the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor.

[0100] Reference Figure 5 , which is a flowchart of another control method of the laser noise reduction system based on diamond NV centers provided by the embodiment of the present invention.

[0101] Step S501, obtain the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor;

[0102] Step S502, determine the target correlation coefficient according to the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor;

[0103] Step S503, adjust the resistance value of the gain resistor according to the target correlation coefficient;

[0104] Specifically, when the laser light source is turned on, the initial laser enters the beam splitting device and is split into the first split light and the second split light by the beam splitting device. The first split light exits vertically from the first prism surface of the beam splitting device, enters the diamond NV center, is converted into the first fluorescence by the diamond NV center, and further irradiates the fluorescence detector; the second split light exits vertically from the second prism surface of the beam splitting device and further irradiates the laser detector.

[0105] The fluorescence detector converts the received first fluorescence into a fluorescence signal, and after converting the fluorescence signal into a first current signal I1, it inputs it to the first photoelectric conversion circuit. Further, obtain the resistance value R7 of the seventh resistor, the resistance value R9 of the ninth resistor, and the resistance value R of the tenth resistor 10 , according to the resistance value R7 of the seventh resistor, the resistance value R9 of the ninth resistor, and the resistance value R of the tenth resistor 10Calculate the first voltage signal after the first current signal I1 passes through the first amplifier After the laser detector converts the received second spectral splitting into the second current signal I2, it is input to the second optoelectronic conversion circuit. Further, obtain the resistance value R8 of the eighth resistor, the resistance value R of the eleventh resistor 11 and the resistance value R of the twelfth resistor 12 , and calculate the second voltage signal after the second current signal I2 passes through the second amplifier according to the resistance value R8 of the eighth resistor, the resistance value R of the eleventh resistor 11 and the resistance value R of the twelfth resistor 12 Calculate the second voltage signal after the second current signal I2 passes through the second amplifier

[0106] Further, input the first voltage signal V A1 and the second voltage signal V A2 to the amplifier circuit to obtain the resistance value R of the gain resistor z , and obtain the output noise reduction voltage V according to the resistance value R of the gain resistor z and the first voltage signal V A1 and the second voltage signal V A2 where the calculation formula of the noise reduction voltage V out is: out The calculation formula is:

[0107]

[0108] where R REF is the resistance value of the gain reference resistor built in the operational amplifier device, is the correlation coefficient

[0109] It can be seen that by adjusting the resistance value of the gain resistor, the target correlation coefficient can be adjusted to obtain the optimal solution of the target correlation coefficient

[0110] Substitute the first voltage signal and the second voltage signal into the calculation formula of the noise reduction voltage V out , and it can be further obtained that:

[0111]

[0112] It can be seen that the optimal solution of the target correlation coefficient can also be further obtained by adjusting the resistance values of the seventh resistor and the eighth resistor, and cooperating with adjusting the resistance values of the ninth resistor, the tenth resistor, the eleventh resistor and the twelfth resistor

[0113] The control method of the laser noise reduction system based on diamond NV centers according to the embodiments of the present invention can adjust the resistance value in the circuit to obtain the optimal correlation coefficient value for laser-related noise reduction, avoiding the error caused by adjusting the optical path structure, effectively reducing the difficulty of debugging the correlation coefficient, and further outputting a low-noise magnetic measurement signal, effectively reducing the test cost and production cost of outputting the low-noise magnetic measurement signal.

[0114] Based on the same concept, corresponding to the control method of the laser noise reduction system based on diamond NV centers provided in any of the above embodiments, the present application also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the program or instruction is executed by the processor, it implements the steps of the control method of the laser noise reduction system based on diamond NV centers as described in the first aspect.

[0115] Figure 6 Figure 7 shows a more specific schematic diagram of the hardware structure of the electronic device provided by the embodiments of the present invention. The device may include: a processor 610, a memory 620, an input / output interface 630, a communication interface 640, and a bus 650. Among them, the processor 610, the memory 620, the input / output interface 630, and the communication interface 640 are communicatively connected to each other inside the device through the bus 650.

[0116] The processor 610 can be implemented in the form of a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, etc., and is used to execute relevant programs to implement the technical solutions provided by the embodiments of this specification.

[0117] The memory 620 can be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 620 can store an operating system and other application programs. When implementing the technical solutions provided by the embodiments of this specification through software or firmware, the relevant program codes are stored in the memory 620 and called and executed by the processor 610.

[0118] The input / output interface 630 is used to connect to the input / output module to enable information input and output. The input / output module can be configured as a component in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Among them, the input devices can include keyboards, mice, touchscreens, microphones, various sensors, etc., and the output devices can include displays, speakers, vibrators, indicator lights, etc.

[0119] The communication interface 640 is used to connect to the communication module (not shown in the figure) to achieve communication interaction between this device and other devices. Among them, the communication module can achieve communication through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0120] The bus 650 includes a path for transmitting information between various components of the device (such as the processor 610, the memory 620, the input / output interface 630, and the communication interface 640).

[0121] It should be noted that although the above device only shows the processor 610, the memory 620, the input / output interface 630, the communication interface 640, and the bus 650, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device may also only include the components necessary to implement the solution of the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0122] The electronic device of the above embodiment is used to implement the corresponding method for designing the size parameters of the energy storage device in any of the foregoing embodiments, and has the beneficial effects of the embodiments of the corresponding method for designing the size parameters of the energy storage device, which will not be elaborated here.

[0123] Based on the same concept, corresponding to the method for designing the size parameters of the energy storage device provided in any of the above embodiments, the present application also provides a computer-readable storage medium. Programs or instructions are stored on the above-readable storage medium, and when the programs or instructions are executed by a processor, the steps of the method for designing the size parameters of the energy storage device as in the first aspect are implemented.

[0124] The above computer-readable storage medium can be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memories (such as floppy disks, hard disks, magnetic tapes, magneto-optical discs (MO), etc.), optical memories (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memories (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NANDFLASH), solid-state drives (SSD)), etc.

[0125] The computer instructions stored in the storage medium of the above embodiments are used to cause a computer to execute the corresponding method for designing the size parameters of the energy storage device in any of the foregoing embodiments, and have the beneficial effects of the embodiments of the corresponding method for designing the size parameters of the energy storage device, which will not be elaborated herein.

[0126] It should be noted that in this document, the "first", "second" and similar terms used in the embodiments do not denote any order, quantity or importance, but are only used to distinguish different components; the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element. In addition, it should be pointed out that the methods and devices in the embodiments of the present application are not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0127] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disc, etc.) and includes several instructions for causing a terminal or a network-side device to execute the methods described in the various embodiments of the present application.

[0128] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above 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, 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 (PGAs), field programmable gate arrays (FPGAs), etc.

[0129] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms of embodiments without departing from the purpose of the present application and the scope protected by the claims. These embodiments are all within the protection scope of the present application.

Claims

1. A laser noise reduction system based on diamond NV color centers, characterized in that, Comprising: A first optoelectronic conversion circuit, which successively connects in series a fluorescence detector and a first amplifier. The light source inlet of the fluorescence detector is oppositely arranged relative to the diamond NV center, and is used for receiving the first fluorescence and detecting a fluorescence signal from the first fluorescence, and converting the fluorescence signal into a first current signal; the first amplifier is used for performing operational amplification on the first current signal to obtain a first voltage signal; A second optoelectronic conversion circuit, which successively connects in series a laser detector and a second amplifier. The light source inlet of the laser detector is oppositely arranged relative to the second prism surface of the beam splitting device, and is used for receiving the second beam splitting and detecting a laser signal from the second beam splitting, and converting the laser signal into a second current signal; the second amplifier is used for performing operational amplification on the second current signal to obtain a second voltage signal; An amplification circuit, comprising an operational amplifier device, and the operational amplifier device is used for outputting a noise reduction voltage at the operational amplifier output end according to the first voltage signal, the second voltage signal and a target correlation coefficient; wherein, the target correlation coefficient is obtained under the condition that the noise signal of the noise reduction voltage is the smallest.

2. The laser noise reduction system based on diamond NV centers according to claim 1, characterized in that, Further comprising: A laser light source, which is used for emitting an initial laser.

3. The laser noise reduction system based on diamond NV color centers according to claim 2, wherein Further comprising: A beam splitting device, comprising a first prism surface and the second prism surface, and the beam splitting device is used for splitting the initial laser into a first beam splitting and a second beam splitting; wherein, the first beam splitting perpendicularly exits through the first prism surface, and the second beam splitting perpendicularly exits through the second prism surface.

4. The laser noise reduction system based on diamond NV color centers according to claim 3, wherein Further comprising: A diamond NV center, which is oppositely arranged relative to the first prism surface, and is used for receiving the first beam splitting exiting from the first prism surface and converting the first beam splitting into the first fluorescence.

5. The laser noise reduction system based on diamond NV centers according to claim 1, wherein, The operational amplifier device includes an inverting input terminal, a non-inverting input terminal and an operational amplifier output terminal. The inverting input terminal is connected to the output terminal of the first optoelectronic conversion circuit and is used for receiving the first voltage signal. The non-inverting input terminal is connected to the output terminal of the second optoelectronic conversion circuit and is used for receiving the second voltage signal.

6. The laser noise reduction system based on diamond NV color centers according to claim 1, wherein The first amplifier includes a first non-inverting input terminal, a first inverting input terminal and a first output terminal; the second amplifier includes a second non-inverting input terminal, a second inverting input terminal and a second output terminal; The first non-inverting input terminal is grounded; The first inverting input terminal is connected to the output terminal of the fluorescence detector and is used for receiving the first current signal; The first inverting input terminal is connected to the first output terminal, and a first resistor is arranged between the first inverting input terminal and the first output terminal; The second non-inverting input terminal is grounded; The second inverting input terminal is connected to the output terminal of the laser detector and is used for receiving the second current signal; the second inverting input terminal is connected to the second output terminal, and a second resistor is arranged between the second inverting input terminal and the second output terminal.

7. The laser noise reduction system based on diamond NV color centers according to claim 6, wherein The first output terminal is connected to the inverting input terminal, and a third resistor is arranged between the first output terminal and the inverting input terminal; the second output terminal is connected to the non-inverting input terminal, and a fourth resistor is arranged between the second output terminal and the non-inverting input terminal.

8. The laser noise reduction system based on diamond NV color centers according to claim 7, characterized in that, The inverting input terminal is connected to the output terminal of the operational amplifier, and a fifth resistor is provided between the inverting input terminal and the output terminal of the operational amplifier; the non-inverting input terminal is grounded, and a sixth resistor is provided between the non-inverting input terminal and the ground terminal.

9. The laser noise reduction system based on diamond NV color centers according to claim 1, characterized in that The first optoelectronic conversion circuit is provided with a seventh resistor, and the second optoelectronic conversion circuit is provided with an eighth resistor (R8).

10. The laser noise reduction system based on diamond NV color centers according to claim 9, characterized in that, The first amplifier includes a third non-inverting input terminal, a third inverting input terminal, and a third output terminal; the second amplifier includes a fourth non-inverting input terminal, a fourth inverting input terminal, and a fourth output terminal; The third non-inverting input terminal and the third inverting input terminal are grounded, and a ninth resistor is provided between the third non-inverting input terminal and the third inverting input terminal and the ground terminal; the third non-inverting input terminal is connected to the output terminal of the fluorescence detector for receiving the first current signal; the third inverting input terminal is connected to the third output terminal, and a tenth resistor is provided between the third inverting input terminal and the third output terminal; The fourth non-inverting input terminal and the fourth inverting input terminal are grounded, and an eleventh resistor is provided between the fourth non-inverting input terminal and the fourth inverting input terminal and the ground terminal; the fourth non-inverting input terminal is connected to the output terminal of the laser detector for receiving the second current signal; the fourth inverting input terminal is connected to the fourth output terminal, and a twelfth resistor is provided between the fourth inverting input terminal and the fourth output terminal; The third output terminal is connected to the inverting input terminal; the fourth output terminal is connected to the non-inverting input terminal.

11. The laser noise reduction system based on diamond NV centers according to claim 10, characterized in that, The operational amplifier device further includes a first gain terminal, a second gain terminal, and a ground pin; A gain resistor is provided between the first gain terminal and the second gain terminal, and the gain resistor is used to adjust the gain value of the operational amplifier of the operational amplifier device; The ground pin is grounded.

12. A control method for a laser noise reduction system based on diamond NV color centers, characterized in that, Applied to the laser noise reduction system based on diamond NV color centers as described in any one of claims 1-11, including: Obtain the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor; Determine the target correlation coefficient according to the first current signal, the second current signal, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor; Adjust the resistance values of the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor according to the target correlation coefficient; Wherein, the target correlation coefficient is expressed as: Among them, and are both correlation coefficients, I1 is the first current signal, I2 is the second current signal, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, R4 is the resistance value of the fourth resistor, R5 is the resistance value of the fifth resistor, and R6 is the resistance value of the sixth resistor.

13. The control method of the laser noise reduction system based on diamond NV color centers according to claim 12, characterized in that, Further includes: Obtain the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor; Determine the target correlation coefficient according to the first current signal, the second current signal, and the resistance values of the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, the eleventh resistor, the twelfth resistor, and the gain resistor; Adjust the resistance value of the gain resistor according to the target correlation coefficient; Wherein, the target correlation coefficient is expressed as: Among them, R REF is the resistance value of the gain reference resistor built in the operational amplifier device, is the correlation coefficient, I1 is the first current signal, I2 is the second current signal, R7 is the resistance value of the seventh resistor, R8 is the resistance value of the eighth resistor, R9 is the resistance value of the ninth resistor, R 10 is the resistance value of the tenth resistor, R 11 is the resistance value of the eleventh resistor, R 12 is the resistance value of the twelfth resistor.

14. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the control method of the laser noise reduction system based on diamond NV color centers as described in any one of claims 12 to 13.

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