High-resolution optical fiber integrated diamond color center sensor and measuring method

Abstract

The invention discloses a high-resolution optical fiber integrated diamond color center sensor and a measuring method, the sensor comprises an optical fiber responsible for inputting exciting light and collecting fluorescence, the end face of the optical fiber is provided with a diamond color center, the diamond color center is excited by the output of the optical fiber, and a quartz capillary is arranged outside the optical fiber and the diamond color center. A microwave antenna is wound outside the quartz capillary tube, and a part of a bare wire of the microwave antenna is connected with the radio frequency line. The measuring method comprises the following steps: exciting a diamond color center; applying microwaves to the diamond color center; fluorescence generated by stimulated radiation of the NV color center is output by the optical fiber circulator and is input into the photoelectric detector through the filter; the upper computer controls the microwave generator to sweep frequency; the photoelectric detector performs photoelectric conversion, and the upper computer processes microwave frequency sweeping signals and electric signals. The magnetic field size and the temperature size of the sample to be measured in the micro space can be measured, and the device has the advantages of being high in spatial resolution, high in integration level, high in flexibility, high in controllability and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors, and in particular relates to a high-resolution optical fiber integrated diamond color center sensor and a measurement method. Background Art

[0002] The development of magnetic field measurement technology has gone through several stages, from magnetometry, electromagnetic induction, magnetic saturation, electromagnetic effect, magnetic resonance to superconducting effect. These technologies are widely used in aerospace engineering, industry, national defense and military. Traditional temperature sensors mainly include thermoelectric temperature sensors and temperature semiconductor sensors, such as temperature sensors based on thermal expansion temperature measurement, thermoelectric temperature sensors based on thermocouples and thermistors, and semiconductor temperature sensors based on semiconductor junctions. Although these methods are mature in technology, they are easily affected by environmental factors, resulting in reduced temperature detection accuracy and high errors. In addition, they are large in size and cannot be used for temperature measurement of tiny targets. In fields such as biomedicine and materials science, the application of traditional temperature and magnetic field sensors is greatly limited, mainly in terms of low spatial resolution, low integration, and difficulty in measuring weak changes.

[0003] Some studies have optimized the tip radius of diamond sensor probes to improve fluorescence collection efficiency and spatial resolution [NanoLett.2023,23,22,10110-10117]. Under the premise of high resolution, optical fiber sensors based on diamond color centers have unique advantages in the field of biosensing. For example, studies have shown that diamond color center sensors have broad application prospects in bioimaging [Curr.Opin.Chem.Biol2014,20:69-77], molecular detection [ACS Sens.2021,6,6,2077-2107] and paramagnetic material detection [ACS Sens.2020,5,3,703-710].

[0004] NV centers have stable fluorescence emission and ultra-long electron spin coherence time at room temperature, showing excellent quantum properties without the need for a low-temperature environment, which makes the sensor more practical and easy to integrate into various applications. The above characteristics enable sensors based on NV centers to achieve highly sensitive measurements of electromagnetic fields and temperatures. For example, high-precision measurements of magnetic fields can be achieved through optical detection magnetic resonance (ODMR) technology. NV centers can not only be used for magnetic field measurements, but also for the measurement of other physical quantities such as temperature and pressure by adjusting energy levels, making them a versatile quantum sensor. The size of NV centers is at the nanometer level, and by using manipulation and detection methods with super-diffraction limit spatial resolution, physical quantities of nanostructures can be measured. However, the physical quantities of micron structures put forward higher spatial resolution and integration requirements for sensors based on NV centers. Summary of the invention

[0005] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a high-resolution fiber-integrated diamond color center sensor and a measurement method.

[0006] The technical solution of the present invention is: a high-resolution fiber-optic integrated diamond color center sensor, including an optical fiber responsible for inputting excitation light and collecting fluorescence, a diamond color center is arranged at the end face of the optical fiber, and the diamond color center is excited by the output of the optical fiber, a quartz capillary is arranged outside the optical fiber and the diamond color center, a microwave antenna is wrapped outside the quartz capillary, and part of the bare wire of the microwave antenna is connected to the radio frequency line.

[0007] Furthermore, the input end of the radio frequency line is connected to a microwave amplifier, and the input end of the microwave amplifier is connected to a microwave generator.

[0008] Furthermore, the optical fiber is obtained by stripping an optical fiber jumper, and the input end of the optical fiber jumper is connected to the second optical fiber ring part of the optical fiber circulator.

[0009] Furthermore, the first optical fiber ring portion of the optical fiber circulator is connected to the output end of the laser.

[0010] Furthermore, the fluorescence outputted by the third optical fiber ring part of the optical fiber circulator is transmitted to the photoelectric detector after passing through the filter, and the photoelectric detector is connected to the host computer.

[0011] Furthermore, the microwave antenna coil is on the outer surface of the quartz capillary and corresponds to the position of the diamond color center inside the quartz capillary.

[0012] Furthermore, the optical fiber fixes the diamond color center on its end face in a specific direction through ultraviolet curing glue.

[0013] Furthermore, the diamond color center is prepared by chemical vapor deposition and laser cutting, and has a size of 100*100*100 μm.

[0014] A method for measuring a high-resolution fiber-integrated diamond color center sensor comprises the following steps:

[0015] A. Excite the diamond color center;

[0016] B. Apply microwaves to diamond color centers;

[0017] C. The fluorescence generated by the stimulated radiation of the NV color center is output by the fiber circulator and input into the photodetector through the filter;

[0018] D. The host computer controls the microwave generator to sweep the frequency;

[0019] E. The photodetector converts the received light signal into an electrical signal;

[0020] G. The host computer processes microwave frequency sweep signals and electrical signals.

[0021] Furthermore, in step A, the spin of the diamond color center NV color center is initialized to complete the preparation for the manipulation of the NV color center quantum state.

[0022] The beneficial effects of the present invention are as follows:

[0023] The size of the diamond color center used in the present invention is 100*100*100μm. Thanks to the small size of the diamond color center, the overall minimum size of the sensor probe can be controlled at 270μm, and the probe part has a high degree of integration, so the present invention has a high spatial resolution; the concentration of the NV color center doped in the present invention is high, and the diamond color center matches the size of the optical fiber end face, so the fluorescence excitation efficiency and fluorescence collection efficiency of the present invention are high.

[0024] The sensor probe part of the present invention is replaceable. Diamond color centers with different sizes and different NV color center concentrations are used to integrate probes according to different needs. The sensor system can be continuously optimized by optimizing the size of the diamond color center and selecting a better NV color center concentration. Therefore, the present invention has good flexibility and high controllability.

[0025] Based on the above characteristics, the present invention can achieve stable measurement of physical quantities of micron structures with high spatial resolution by virtue of the high integration of the probes and has strong practicality.

[0026] The sensor system used in the present invention has a stable fluorescence emission and an ultra-long electron spin coherence time of the NV color center at room temperature, so that the sensor based on the NV color center can achieve high-sensitivity measurement of electromagnetic fields and temperature. By reading the NV color center electron spin state through optical detection magnetic resonance (ODMR) technology, high-precision measurement of magnetic fields and temperature can be achieved.

[0027] The present invention can exhibit excellent sensing performance at room temperature without the need for a low-temperature environment, which makes the sensor more practical and easy to integrate into various applications. The present invention uses optical fiber integration technology to combine the NV color center with the optical fiber system, and utilizes the excellent light transmission capability of the optical fiber to achieve a highly integrated, high spatial resolution sensing system, which is convenient for practical application and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of an optical fiber integrated diamond color center sensor in the present invention;

[0029] Figure 2 is a schematic diagram of a sensor probe in the present invention;

[0030] Figure 3 It is a schematic diagram of the measuring method in the present invention;

[0031] Figure 4 It is the principle diagram of magnetic field sensing in the present invention;

[0032] Figure 5 It is the principle diagram of temperature sensing in the present invention;

[0033] in:

[0034] 1 fiber 2 fiber patch cord

[0035] 3Diamond color center 4Quartz capillary

[0036] 5 microwave antenna 6 radio frequency line

[0037] 7 Microwave amplifier 8 Microwave generator

[0038] 9Laser10Fiber Circulator

[0039] 11 filter 12 photodetector

[0040] 13 Host computer

[0041] 10-1 first optical fiber ring portion 10-2 second optical fiber ring portion

[0042] 10-3 The third optical fiber ring portion. DETAILED DESCRIPTION

[0043] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0044] like Figures 1 to 5 As shown, a high-resolution fiber-integrated diamond color center sensor includes an optical fiber 1 responsible for inputting excitation light and collecting fluorescence, a diamond color center 3 is arranged at the end face of the optical fiber 1, and the diamond color center 3 is excited by the output of the optical fiber 1, a quartz capillary 4 is arranged outside the optical fiber 1 and the diamond color center 3, a microwave antenna 5 is wound outside the quartz capillary 4, and a part of the bare wire of the microwave antenna 5 is connected to the radio frequency line 6.

[0045] The input end of the radio frequency line 6 is connected to a microwave amplifier 7 , and the input end of the microwave amplifier 7 is connected to a microwave generator 8 .

[0046] The optical fiber 1 is obtained by stripping an optical fiber jumper 2 , and the input end of the optical fiber jumper 2 is connected to the second optical fiber ring part 10 - 2 of the optical fiber circulator 10 .

[0047] The first fiber ring portion 10 - 1 of the fiber circulator 10 is connected to the output end of the laser 9 .

[0048] The fluorescence outputted by the third fiber optic ring portion 10 - 3 of the fiber optic circulator 10 is transmitted to the photodetector 12 after passing through the filter 11 , and the photodetector 12 is connected to the host computer 13 .

[0049] The coil of the microwave antenna 5 is on the outer surface of the quartz capillary 4 and corresponds to the position of the diamond color center 3 inside the quartz capillary 4 .

[0050] The optical fiber 1 has a diamond color center 3 fixed on its end face in a specific direction by ultraviolet curing glue.

[0051] The diamond color center 3 is prepared by chemical vapor deposition and laser cutting, and has a size of 100*100*100 μm.

[0052] Specifically, the end face of the optical fiber 1 is cut flat by an optical fiber cutter. The optical fiber 1 comprises an optical fiber core and a cladding, the diameter of the optical fiber core is 62.5 μm, and the diameter of the optical fiber 1 can be but is not limited to 105 μm.

[0053] Specifically, the quartz capillary 4 is placed outside the diamond color center 3 and the optical fiber core 1, and the quartz capillary 4 adopts different styles for temperature or magnetic field measurement.

[0054] As an implementation manner, the quartz capillary 4 is closed at one end and open at the other end for magnetic field measurement.

[0055] As another embodiment, the quartz capillary 4 is open at both ends for temperature measurement.

[0056] Specifically, the diamond color center 3 and the optical fiber 1 are protected by a quartz capillary 4 , and the inner diameter of the quartz capillary 4 is 150 μm and the outer diameter is 170 μm.

[0057] Specifically, the two pins of the microwave antenna 5 are both led to the output side of the radio frequency line 6. And the two pins of the microwave antenna 5 are welded to the output end of the radio frequency line 6.

[0058] More specifically, the microwave antenna 5 is a copper wire, the winding part is a copper wire coil, and a small part of the two pins of the microwave antenna 5 is a copper wire with skin. The diameter of the microwave antenna 5 can be but is not limited to 50 μm.

[0059] Specifically, the lattice direction 100 in the diamond color center 3 is parallel to the end face of the optical fiber 1 .

[0060] As an implementation manner, the microwave antenna 5 has 6 turns, a diameter of the microwave antenna 5 is 50 μm, and a length of the microwave antenna coil is about 300 μm.

[0061] More specifically, the portion of the microwave antenna 5 that remains horizontal contains about 1 mm of copper wire with skin.

[0062] More specifically, the optical fiber 1 is obtained by removing the protective cover and the coating layer of the optical fiber 1 from the optical fiber jumper 2, and the optical fiber 1 is cut into a flat end face by an optical fiber cutter. The length of the optical fiber 1 is 1 cm.

[0063] More specifically, a wire stripper is used to separate the radio frequency line 6 into two parts, namely, a ground wire and a tinned copper wire. Two pins of the microwave antenna 5 are respectively wound around the two parts and are firmly soldered with an electric soldering iron and solder.

[0064] A method for measuring a high-resolution fiber-integrated diamond color center sensor comprises the following steps:

[0065] A. Excite the diamond color center 3;

[0066] B. applying microwaves to the diamond color center 3;

[0067] C. The fluorescence generated by the stimulated radiation of the NV color center is output by the optical fiber circulator 10 and input into the photodetector 12 through the filter 11;

[0068] D. The host computer 13 controls the microwave generator 8 to perform frequency sweep;

[0069] E. The photodetector 12 converts the received optical signal into an electrical signal;

[0070] G. The host computer 13 processes the microwave frequency sweep signal and the electrical signal.

[0071] In step A, the spin of the diamond color center 3NV color center is initialized to complete the preparation for the manipulation of the NV color center quantum state.

[0072] Specifically, step A excites the diamond color center 3, and the specific process is as follows:

[0073] The laser 9 emits laser light which is input into the optical fiber jumper through the optical fiber circulator 10 and output through the optical fiber 1 to excite the diamond color center 3 .

[0074] Specifically, step B applies microwaves to the diamond color center 3, and the specific process is as follows:

[0075] The microwave generator 8 generates microwaves which are amplified by the microwave amplifier 7 and input into the radio frequency line 6 . The radio frequency line 6 outputs the microwaves to the microwave antenna 5 . The microwave antenna 5 applies the microwaves to the diamond color center 3 .

[0076] Specifically, the laser excitation, fluorescence collection, microwave frequency scanning and photoelectric conversion processes involved in the above steps are all carried out simultaneously.

[0077] Specifically, the working process of the sensor is as follows:

[0078] First, after initialization is completed by operating step A for a long time, step A is performed to excite the NV color center, so that the NV color center undergoes energy level transition and emits red light by stimulated radiation;

[0079] Then, a microwave field is applied to the diamond color center 3 while the laser is exciting. At a specific microwave frequency, the fluorescence emitted by the diamond color center 3 is the weakest.

[0080] Then, the photodetector 12 collects the fluorescence emitted by the stimulated radiation of the NV color center doped in the diamond color center 3 and converts the optical signal into an electrical signal;

[0081] Finally, the host computer 13 processes the received signal to form an ODMR spectrum. The magnetic field change and temperature change can be obtained from the resonance frequency difference or center frequency displacement in the spectrum.

[0082] Specifically, the quantum state information of the NV color center can be obtained through the above steps. The specific process is as follows:

[0083] First, perform step A separately to complete the preparation work for NV color center spin initialization, i.e., spin quantum state manipulation. The specific process is as follows:

[0084] Laser 9 emits green light, which continues to excite the NV color center for a period of time, and then initialization is completed;

[0085] Then, the preparation work is completed, and step A and step B are carried out simultaneously to perform quantum state manipulation on the NV color center doped in the diamond color center. The specific process is as follows:

[0086] First, the laser 9 emits a 532nm green light which is input into the input end of the optical fiber jumper 2 through the optical fiber circulator 10. The NV color center in the diamond color center 3 fixed on the end face of the optical fiber 1 will be excited. At this time, the diamond color center 3 emits red light which is collected by the optical fiber 1 and input into the optical fiber jumper 2. The collected fluorescence is output from the optical fiber circulator 10, filtered out the green light by the filter 11, and then input into the input end of the photodetector 12.

[0087] While the laser excites the diamond color center, the microwave generator 8 inputs the microwave into the microwave amplifier 7, the microwave is amplified by the microwave amplifier 7 and then output, the amplified microwave is input into the ground wire of the radio frequency line 6 and the tinned microwave antenna, and finally input into the coil of the microwave antenna 5;

[0088] Then, by changing the microwave frequency, the fluorescence intensity emitted by the diamond color center will change accordingly, and the photodetector 12 converts the changing fluorescence signal into a changing electrical signal. The microwave is swept;

[0089] Finally, the host computer 13 processes the frequency sweep signal and the electrical signal to form an ODMR spectrum.

[0090] Specifically, the method for preparing the diamond color center 3 has the following specific process:

[0091] First, a diamond color center crystal with a crystal orientation of 100 is synthesized by CVD (chemical vapor deposition) method;

[0092] Then, a laser is used to cut the diamond color center into 100-micron-sized cubes along 100 lattice directions;

[0093] Then, the NV color center is characterized by fluorescence spectroscopy and optical detection magnetic resonance (ODMR) techniques to ensure that its optical and spin properties meet the requirements;

[0094] Finally, X-ray diffraction was used to confirm that the internal lattice direction of the cut diamond color center was indeed the 100 direction.

[0095] Specifically, the method of fixing the diamond color center 3 on the end face of the optical fiber 1 is as follows:

[0096] First, use a wire stripper to remove the protective cover and coating layer from the output end of the optical fiber jumper 2 to obtain the optical fiber 1;

[0097] Then, use a cutting knife to cut the end face of optical fiber 1 flat, and wipe optical fiber 1 clean with alcohol cotton, drop a drop of UV glue solution on the slide, use the end face of optical fiber 1 to dip a small amount of UV glue solution, and use another optical fiber to scrape off the excess UV glue solution except the end face of optical fiber 1;

[0098] Finally, the diamond color center 3 is placed on a glass slide, the diamond color center 3 is glued under a microscope, and the ultraviolet glue solution is solidified by irradiating it with an ultraviolet lamp.

[0099] Specifically, the method of fixing the microwave antenna 5 on the quartz capillary 4 is as follows:

[0100] First, a suitable position is selected on the quartz capillary 4, which corresponds to the position of the diamond color center 3 in the quartz capillary 4;

[0101] Then, three turns of coils are wound around the position to both sides, and the pins at both ends of the microwave antenna 5 are placed close to the radio frequency line 6;

[0102] Finally, a proper amount of ultraviolet glue solution is dripped on the coil of the microwave antenna 5 and cured by ultraviolet light.

[0103] Specifically, the method for fixing the two pins of the microwave antenna 5 and the output end of the radio frequency line 6 is as follows:

[0104] First, use wire strippers to remove the protective cover of the radio frequency line 6, separate the ground wire and the tinned copper wire in the radio frequency line 6 to form two wires;

[0105] Then, the two pins of the microwave antenna 5 are respectively wound around the two strands of wire;

[0106] Finally, use an electric soldering iron and solder to solder the two pins and two strands of the microwave antenna 5 respectively.

[0107] Specifically, the method for fixing the quartz capillary 4 and the optical fiber jumper 2 is as follows:

[0108] Take a quartz capillary 4 with a length of about 1.1 cm, ensure that the quartz capillary 4 can completely cover the diamond color center 3 and the optical fiber 1, and make the quartz capillary 4 close to the end face of the protective cover of the optical fiber jumper 2 at the end of the optical fiber 1. Drop a proper amount of UV curing glue on the place where the quartz capillary 4 and the end face of the optical fiber jumper 2 are close to each other, and fix them with UV lamp.

[0109] As a more specific implementation

[0110] Based on the above high-resolution fiber-integrated diamond color center sensor, the ODMR spectrum can be observed under zero field, as shown in the attached figure. Figure 3 shown.

[0111] Based on the above high-resolution fiber-integrated diamond color center sensor, due to the Zeeman effect, two resonance peaks can be observed at the center frequency of the ODMR spectrum under an external magnetic field. The corresponding two resonance frequencies are shown in the attached figure. Figure 4 shown.

[0112] The resonance frequency of the resonance peak in the spectrum and the actual magnetic field satisfy the formula:

[0113] V=2αγB (1)

[0114] Among them, V is the difference between the two resonance frequencies, α is the angle between the actual magnetic field and the NV color center axis, γ is the electron spin magnetic ratio, and B is the magnetic field size.

[0115] It can be seen from the above formula that the splitting degree of the two resonance peaks, that is, the difference in the center frequency of the resonance peaks, is proportional to the magnitude of the axial NV color center magnetic field. When the high spatial resolution fiber integrated sensor of the diamond color center NV color center is used to detect the magnetic field to be measured, the axial magnetic field will cause m s =±1 degeneracy, which appears as two split resonance peaks in the ODMR spectrum. As the magnetic field increases, the degree of splitting of the resonance peaks changes linearly.

[0116] Based on the above high-resolution fiber-integrated diamond color center sensor, since the zero-field splitting is temperature-dependent, temperature changes will cause the center frequency of the ODMR spectral line to shift, as shown in the attached Figure 5 shown.

[0117] The following formula (1) is the principle formula for the frequency shift of the center frequency of the ODMR spectrum caused by temperature change:

[0118]

[0119] Among them, T is the temperature of the object to be measured, and D is the zero-field splitting value. It can be seen from the above formula that the temperature T and the zero-field splitting value D are approximately linearly related. When the temperature increases, the zero-field splitting value D decreases, which is manifested in the ODMR spectrum as the center frequency shifting to a low frequency.

[0120] The present invention combines the NV color center with the optical fiber system through the optical fiber integration technology, and utilizes the characteristics of the NV color center with stable fluorescence emission and ultra-long electron spin coherence time at room temperature and the excellent light transmission ability of the optical fiber. The advantages of the present invention are as follows: the present invention uses 100*100*100μm diamond color center and optical fiber integration to realize a sensor probe with high integration and spatial resolution; the size of the diamond color center used in the present invention matches the size of the optical fiber end face, which improves the fluorescence excitation efficiency and fluorescence collection efficiency of the sensor; the sensor probe of the present invention can be replaced, and diamond color centers with different sizes and different NV color center concentrations are used to integrate the probe according to different needs, and the integration and spatial resolution of the sensor can be continuously optimized by changing the size of the diamond color center and the NV color center concentration. Therefore, the present invention has good flexibility and high controllability. Based on the above advantages, the present invention can detect the weak changes in temperature and magnetic field of small-sized targets to be measured in the fields of chips, new materials and biomedicine by virtue of high integration and high spatial resolution.

[0121] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-resolution fiber-integrated diamond color center sensor, characterized in that: The invention comprises an optical fiber (1) for inputting excitation light and collecting fluorescence, wherein a diamond color center (3) is arranged at the end face of the optical fiber (1), and the diamond color center (3) is excited by the output of the optical fiber (1), and a quartz capillary (4) is arranged outside the optical fiber (1) and the diamond color center (3), and a microwave antenna (5) is wound outside the quartz capillary (4), and a part of the bare wire of the microwave antenna (5) is connected to a radio frequency line (6).

2. A high-resolution fiber-integrated diamond color center sensor according to claim 1, characterized in that: The input end of the radio frequency line (6) is connected to the microwave amplifier (7), and the input end of the microwave amplifier (7) is connected to the microwave generator (8).

3. The high-resolution fiber-integrated diamond color center sensor according to claim 1, characterized in that: The optical fiber (1) is obtained by stripping an optical fiber jumper (2), and the input end of the optical fiber jumper (2) is connected to the second optical fiber ring part (10-2) of the optical fiber circulator (10).

4. The high-resolution fiber-integrated diamond color center sensor according to claim 3, characterized in that: The first optical fiber ring portion (10-1) of the optical fiber circulator (10) is connected to the output end of the laser (9).

5. The high-resolution fiber-integrated diamond color center sensor according to claim 3, characterized in that: The fluorescence output by the third optical fiber ring portion (10-3) of the optical fiber circulator (10) is transmitted to the photoelectric detector (12) after passing through the filter (11), and the photoelectric detector (12) is connected to the host computer (13).

6. The high-resolution fiber-integrated diamond color center sensor according to claim 2, characterized in that: The microwave antenna (5) coil is on the outer surface of the quartz capillary (4) and corresponds to the position of the diamond color center (3) inside the quartz capillary (4).

7. The high-resolution fiber-integrated diamond color center sensor according to claim 1, characterized in that: The optical fiber (1) fixes the diamond color center (3) on its end face in a specific direction by means of ultraviolet curing glue.

8. The high-resolution fiber-integrated diamond color center sensor according to claim 1, characterized in that: The diamond color center (3) is prepared by chemical vapor deposition and laser cutting, and has a size of 100*100*100 μm.

9. A method for measuring a high-resolution fiber-integrated diamond color center sensor, characterized in that: The following steps are involved: A. Excite the diamond color center (3); B. applying microwaves to the diamond color center (3); C. The fluorescence generated by the stimulated radiation of the NV color center is output by the optical fiber circulator (10) and input into the photodetector (12) through the filter (11); D. The host computer (13) controls the microwave generator (8) to perform frequency sweep; E. The photodetector (12) converts the received optical signal into an electrical signal; G. The host computer (13) processes the microwave frequency sweep signal and the electrical signal.

10. The method for measuring a high-resolution fiber-integrated diamond color center sensor according to claim 9, characterized in that: In step A, the spin of the diamond color center (3) NV color center is initialized to complete the preparation for the manipulation of the NV color center quantum state.

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