CN115524644A - Pumping-detection type atomic magnetometer probe structure - Google Patents
Pumping-detection type atomic magnetometer probe structure Download PDFInfo
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- CN115524644A CN115524644A CN202211156179.0A CN202211156179A CN115524644A CN 115524644 A CN115524644 A CN 115524644A CN 202211156179 A CN202211156179 A CN 202211156179A CN 115524644 A CN115524644 A CN 115524644A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
Abstract
The invention discloses a pumping-detection type atomic magnetometer probe structure, which specifically comprises a probe shell, a wave plate, a polarization spectroscope, a reflector, a radio frequency coil, a heating assembly, an absorption bubble and a differential amplification circuit, wherein the wave plate is arranged on the probe shell; the probe is optical integration of a pumping-detection type atomic magnetometer desktop test system, can normally realize the magnetic field measurement function of the dual-beam atomic magnetometer, and has equivalent sensitivity; the processing materials of all components in the probe are non-magnetic materials, and the absorption bubble heating adopts a non-magnetic heating technology, so that no additional magnetic field interference exists in the working process of the magnetometer, the magnetic field measurement function of the pumping-detection type atomic magnetometer can be realized, and the high sensitivity index can be reached; the invention can realize the portability of the pumping-detection type atomic magnetometer, expand the application range of the pumping-detection type atomic magnetometer and have industrial development prospect.
Description
Technical Field
The invention belongs to the technical field of magnetic field precision measurement, and particularly relates to a pumping-detection type probe structure of an atomic magnetometer.
Background
In the field of magnetic field measurement, atomic magnetometers are commonly used precision measuring instruments. The high-performance magnetometer can be applied to geomagnetic matching navigation, military magnetic heteroderangement and bathypergy, mineral resource exploration, space magnetic field detection and the like. At present, various atomic magnetometers such as an optical pump magnetometer, a coherent population trapping magnetometer, a pumping-detection type magnetometer and a spin-exchange-free relaxation magnetometer exist internationally. The pumping-detection type atomic magnetometer has the characteristics of high sensitivity and quick response, and has more advantages in practical application compared with other atomic magnetometers. The measuring range of the pumping-detecting type atom magnetometer invented at home at present can reach 100 nT-100000 nT, the sampling rate of the magnetic field can be adjusted within the range of 1 Hz-1000 Hz, and the sensitivity index of the atom magnetometer reaches 0.2pT/Hz 1/2 @1Hz (noise power spectral density) (CN 107015172 b, 2019.09.10), the tracking locking capability of the pumping-detection type atomic magnetometer on the abrupt change external magnetic field is also stronger than that of the single-beam optical pump magnetometer. Although the pumping-detection type atomic magnetometer is excellent in performance in various indexes, the optical path of the pumping-detection type atomic magnetometer is complex, and the pumping-detection type atomic magnetometer is mainly stopped at a laboratory desktop system stage at present, so that the practicability of the pumping-detection type atomic magnetometer is limited. How to realize the optical path integration of the pumping-detection type atomic magnetometer is a core technology for expanding the application of the type of magnetometer.
Disclosure of Invention
In view of this, the present invention provides a probe structure of a pumping-detection type atomic magnetometer, which can realize optical path integration of the pumping-detection type atomic magnetometer and ensure that the atomic magnetometer can realize a magnetic field measurement function with high performance index.
A pumping-detection type atomic magnetometer probe structure mainly comprises a first light path adjusting component, a second light path adjusting component, a third light path adjusting component, an absorption bubble (5), a heating module (4), a radio frequency coil component (6), a photoelectric detector and a differential amplifying circuit (11);
the heating module (4) is used for heating the absorption bubble (5) to evaporate alkali metal atoms in the absorption bubble (5) into gas, so that the density of alkali metal atom vapor in the absorption bubble (5) is ensured to meet the working condition of an atom magnetometer;
the radio frequency coil assembly (6) is used for generating a radio frequency magnetic field, so that the magnetic moment of the polarized alkali metal atoms precesses to a plane vertical to the external magnetic field, and the magnetic moment performs Larmor precession free relaxation around the external magnetic field;
the first optical path adjusting component adjusts the detection light into linearly polarized light, the linearly polarized light irradiates the absorption bubble (5) from one side, and the detection light is emitted from the absorption bubble (5) after interacting with atoms in the alkali metal gas in the absorption bubble (5);
the second optical path adjusting component adjusts pumping light emitted by the laser into circularly polarized light, the circularly polarized light irradiates the glass absorption bubble (5) from the side wall, and the polarization of alkali metal atoms in the absorption bubble (5) is realized through the optical pumping action; the third light path adjusting component divides the detection light emitted by the absorption bubble (5) into two vertical paths, namely s light and p light, which are respectively received by different photoelectric detectors, the differential amplifying circuit (11) receives light signals received by the two photoelectric detectors, and the light signals are sent to the electronic processing unit at the rear end after differential amplification, so that the external magnetic field value is calculated.
Preferably, the first optical path adjusting component includes a first half wave plate (1), a first polarization beam splitter (2), and a first reflector (3); the second optical path adjusting component comprises a third half-wave plate (12), a third polarization beam splitter (13) and a quarter-wave plate (14); the third optical path adjusting component comprises a second reflecting mirror (7), a second half-wave plate (8), a second polarizing beam splitter (9) and a third reflecting mirror (10); one path of laser emitted by the laser is adjusted into linearly polarized light through the first one-half wave plate (1) and the first polarization spectroscope (2) to serve as detection light, and the linearly polarized light is reflected into the absorption bubble (5) through the first reflector (3);
the other path of laser emitted by the laser is adjusted into linearly polarized light through a third half-wave plate (12) and a third polarization spectroscope (13), then the linearly polarized light is changed into circularly polarized light through a quarter-wave plate (14) and is used as pumping laser to irradiate from the side wall of the absorption bubble (5);
the detection light is reflected by a second reflecting mirror (7) after interacting with alkali metal atoms in the absorption bubble (5), and then is divided into two beams, namely s light and p light, by a second polarizing beam splitter (9).
Preferably, the third optical path adjusting assembly further includes a second half-wave plate (8) disposed in front of the second polarization beam splitter (9) for adjusting the magnitude of the signals received by the two photodetectors.
Preferably, the absorption bubble (5) is processed by cylindrical transparent glass; the thermistor is adhered to the outer wall of the glass of the absorption bulb (5), the temperature of the absorption bulb (5) is measured through the thermistor, and the working power of the heating module (4) is fed back and controlled to realize constant temperature control.
Preferably, the radio frequency coil assembly (6) comprises an upper disc and a lower disc, a groove is formed in the waist line of each disc, and the enameled wires are uniformly wound in the grooves of the upper disc and the lower disc to form the radio frequency coil; the winding directions of the upper coil and the lower coil are the same, and the number of turns of the upper coil and the lower coil is the same; the absorption bubble (5) and the heating component are fixed between the upper disc and the disc.
Preferably, the heating module (4) comprises two cylinder structures, the surfaces of the cylinders are tightly wound around the twisted pairs, and alternating current is conducted to heat the cylinder structures; an absorption bubble (5) is placed between the two cylindrical structures.
The wave plate fixing component is made of nonmagnetic metal materials and comprises two parts, namely a supporting seat and a fixing frame; the supporting seat is provided with a square groove capable of accommodating the fixing frame, and mounting holes are formed in corresponding positions of the supporting seat and the fixing frame and fixed together through screws; a circular groove is formed in the middle of the groove of the supporting seat, a circular through hole is formed in the bottom of the groove, and a circular through hole is formed in the middle of the fixing frame; the wave plate is placed in circular recess, and circular through-hole is used for leading to light, and the mount is fixed in square recess to pass through the screw fastening.
Preferably, the edge of the circular groove is provided with two through grooves.
Preferably, the fixing component of the reflector is made of nonmagnetic metal materials and respectively comprises a reflector frame (15), a back plate (16) and a base (17), and the reflector frame, the back plate and the base are fixed together in an adhesive mode; the reflector is adhered to the reflector frame (15), the upper end of the reflector is provided with a threaded hole, and the fine adjustment of the laser reflection direction can be realized by adjusting the distance between the reflector frame (15) and the back plate (16) through screws.
The optical path adjusting device comprises a probe shell, and is characterized by further comprising a closed probe shell, wherein the optical path adjusting component I, the optical path adjusting component II, the optical path adjusting component III, an absorption bubble (5), a heating module (4), a radio frequency coil component (6), a photoelectric detector and a differential amplifying circuit (11) are fixed in the probe shell; the probe shell is made of black polyformaldehyde materials.
The invention has the following beneficial effects:
the invention discloses a pumping-detection type probe structure of an atomic magnetometer, which specifically comprises a probe shell, a wave plate, a polarization spectroscope, a reflector, a radio frequency coil, a heating assembly, an absorption bubble and a differential amplification circuit; the probe is optical integration of a pumping-detection type atomic magnetometer desktop test system, can normally realize the magnetic field measurement function of the dual-beam atomic magnetometer, and has equivalent sensitivity; the processing materials of all components in the probe are non-magnetic materials, and the absorption bubble heating adopts a non-magnetic heating technology, so that no additional magnetic field interference exists in the working process of the magnetometer, the magnetic field measurement function of the pumping-detection type atomic magnetometer can be realized, and the high sensitivity index can be reached; the invention can realize the portability of the pumping-detection type atomic magnetometer, expands the application range of the pumping-detection type atomic magnetometer and has industrial development prospect.
Drawings
FIG. 1 is a diagram of a magnetometer probe optical path structure;
FIG. 2 is an overall appearance structure of the magnetometer;
FIG. 3 shows the internal structure of a magnetometer probe;
FIG. 4 is a schematic view of a heating assembly;
FIG. 5 is a schematic view of a radio frequency coil assembly;
FIG. 6 is a schematic view of a wave plate fixing assembly;
FIG. 7 is a schematic view of a wave plate assembly and a fixing base of a polarization beam splitter;
figure 8 is a schematic view of a mirror frame assembly.
The device comprises a first half-wave plate 1, a first polarizing beam splitter 2, a first reflector 3, a heating module 4, an absorption bulb 5, a radio-frequency coil 6, a second reflector 7, a second half-wave plate 8, a second polarizing beam splitter 9, a third reflector 10, a differential amplification circuit 11, a third half-wave plate 12, a third polarizing beam splitter 13, a quarter-wave plate 14, a reflecting mirror frame 15, a back plate 16 and a base 17.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a pumping-detection type atomic magnetometer probe structure, which comprises an absorption bubble 5, a heating module 4, a radio frequency coil assembly 6, a photoelectric detector and a differential amplification circuit 11.
The laser outputs two paths of laser, wherein the pumping light frequency is equal to the transition frequency of the D1 line of the alkali metal atoms, and the detection light frequency is the red detuning frequency of the D1 line transition frequency of 4-10GHz.
The heating module 4 is used for heating the absorption bubble 5 to evaporate alkali metal atoms in the absorption bubble 5 into gas, so as to ensure that the density of the alkali metal atom vapor in the absorption bubble 5 meets the working conditions of the atomic magnetometer.
The radio frequency coil assembly 6 is used for generating a radio frequency magnetic field with specific duration, specific amplitude and specific frequency, so that the magnetic moment of the polarized alkali metal atoms precesses to a plane perpendicular to the external magnetic field, the magnetic moment performs Larmor precession free relaxation around the external magnetic field after the excitation magnetic field is closed, and the relaxation signal is measured by the probe light.
The first optical path adjusting component adjusts the detection light into linearly polarized light, the linearly polarized light irradiates the absorption bubble 5 from one side, and the detection light is emitted from the absorption bubble 5 after interacting with atoms in the alkali metal gas in the absorption bubble 5;
the second optical path adjusting component adjusts pumping light emitted by the laser into circularly polarized light, irradiates the glass absorption bubble 5 from the side wall, and realizes polarization of alkali metal atoms in the absorption bubble 5 through optical pumping action (the reference documents are Yang Bao, miao Peixian, shi Yanchao, feng Hao, zhang Jinhai, cui Jingzhong, liu Zhidong, theoretical and experimental researches of two-level magnetic resonance classical physical images, chinese laser, 2020,47 (10), 1012001).
The third optical path adjusting component divides the detection light emitted by the absorption bubble 5 into two vertical paths, namely s light and p light, which are respectively received by different photoelectric detectors, the differential amplifying circuit 11 receives light signals received by the two photoelectric detectors, the light signals are sent to the electronic processing unit at the rear end after differential amplification, in the electronic processing unit, larmor precession signals of alkali metal atom magnetic moments around an external magnetic field are subjected to fast Fourier transform to determine larmor precession frequency, then, an external magnetic field value is calculated, and detection of a magnetometer is completed.
In this embodiment, the first optical path adjusting component includes a first half-wave plate 1, a first polarization beam splitter 2, and a first reflector 3, and the second optical path adjusting component includes a third half-wave plate 12, a third polarization beam splitter 13, and a quarter-wave plate 14; the third optical path adjusting component includes a second reflecting mirror 7, a second half-wave plate 8, a second polarizing beam splitter 9 and a third reflecting mirror 10.
The detection light emitted by the laser passes through the optical fiber collimator and then enters the probe in a collimation manner, is adjusted into linearly polarized light by the first one-half wave plate 1 and the first polarization spectroscope 2, and is reflected into the absorption bubble 5 by the first reflector 3.
Pumping light emitted by the laser enters the probe after being expanded by the optical fiber collimator and collimated, is adjusted into linearly polarized light by the third half-wave plate 12 and the third polarization spectroscope 13, then is changed into circularly polarized light by penetrating through the quarter-wave plate 14, and enters the probe after being irradiated by the side wall of the absorption bubble 5, so that the polarization process of alkali metal atoms is realized.
The detection light is reflected by the second reflecting mirror 7 after interacting with the alkali metal atoms in the absorption bubble 5, and then is divided into two beams by the second polarizing beam splitter 9, one beam is directly received by one photoelectric detector in the differential amplifying circuit module 11, and the other beam is received by the other photoelectric detector in the differential amplifying circuit module 11 after being reflected by the third reflecting mirror 10. The two photoelectric detectors output Larmor precession signals of the alkali metal atom magnetic moments around the external magnetic field after measuring signals are subjected to differential amplification, the signals determine Larmor precession frequency through fast Fourier transform, and then the external magnetic field value is calculated. Before the detection light enters the second polarization beam splitter 9, the size of the signals received by the two photodetectors can be adjusted through the second half-wave plate 8, and an optimal differential amplification signal is obtained.
In the embodiment, the absorbing bubbles 5 are formed by processing a cylindrical transparent glass, and are filled with an alkali metal and a buffer gas. The absorption bubble 5 is heated by the heating assembly 4. The heating component is made of nonmagnetic metal material. The thermistor is adhered to the outer wall of the glass of the absorption bubble 5, and the constant temperature control is realized by measuring the temperature of the absorption bubble through the thermistor and feeding back and controlling the working power of the heating wire.
The radio frequency magnetic field necessary for the operation of the magnetometer is generated by the radio frequency coil assembly 6, and the absorption bubble 5 is positioned in the uniform area of the radio frequency magnetic field. As shown in fig. 5, the coil winding device comprises an upper disc and a lower disc, a groove is formed in the waist line of the discs, an enameled wire is uniformly wound inside the groove of the upper disc and the lower disc to form a radio frequency coil, the coil is wound below and then wound above, the upper coil and the lower coil are wound in the same direction and the same number of turns, and the enameled wire is led out from an opening in the rear of a probe shell in a twisted-pair mode after the coil is wound. The rf assembly 6 is operative to generate a uniform rf magnetic field in the central region without generating additional magnetic fields. The absorption bubble 5 and the heating component are fixed on the lower disc by gluing, wherein the absorption bubble 5 is positioned at the center of the radio frequency magnetic field. The upper disc of the radio frequency assembly 6 is fixed above the upper disc by four supports.
The absorption bubble 5 finishes heating through the heating component 4, the working temperature is measured through a thermistor adhered to the outer wall of the absorption bubble 5, and the output power of the heating wire is controlled through software feedback to realize constant temperature control. As shown in fig. 4, the heating assembly 4 includes two cylindrical structures, the surface of the cylindrical structure is tightly wound around the twisted pair and is heated by alternating current, so as to ensure that no additional magnetic field interference exists in the heating process; the absorption bulb 5 is placed between two cylindrical structures, the heat of which is conducted to the absorption bulb 5, heating it.
In the embodiment, the half-wave plate and the quarter-wave plate are circular wave plates with the diameter of 25.4mm and are fixed in the wave plate fixing component shown in fig. 6, the wave plate fixing component is made of nonmagnetic metal materials and comprises two parts, namely a supporting seat and a fixing frame; the supporting seat is provided with a square groove capable of accommodating the fixing frame, and mounting holes are formed in corresponding positions of the supporting seat and the fixing frame and fixed together through screws; a circular groove is formed in the middle of the groove of the supporting seat, a circular through hole is formed in the bottom of the groove, and a circular through hole is formed in the middle of the fixing frame; the wave plate is placed in circular recess, and circular through-hole is used for leading to light, and the mount is fixed in square recess to pass through the screw fastening. In addition, the edge of the circular groove is provided with a through groove, so that the wave plate is convenient to assemble and disassemble.
Assembly attachment was accomplished using nylon Long Luoding. And after the wave plate rotates to a proper angle, the wave plate is fixed by a fixing screw at the top of the fixing piece. The polarization beam splitter is a cube of 12.7mm, and the wave plate fixing assembly and the polarization beam splitter are fixed on the support base shown in fig. 7 by gluing to ensure the consistency of the optical system.
To ensure magnetic cleanliness inside the probe, a mirror holding assembly is designed in the embodiment as shown in fig. 8. The reflector fixing component is made of nonmagnetic metal materials and respectively comprises a reflector frame 15, a back plate 16 and a base 17 which are fixed together in an adhesive mode. The reflector is adhered to the reflector frame 15, the upper end of the reflector is provided with a threaded hole, and the fine adjustment of the laser reflection direction can be realized by adjusting the distance between the reflector frame 15 and the back plate 16 through screws. The component module is fixed on other components through screws.
In one embodiment, the above components are all mounted in a closed probe housing as shown in FIG. 2. The probe shell is made of black polyformaldehyde materials and comprises a front panel, a rear panel, side plates, a top cover and a base portion, and all the shell portions are fixed through nylon screws. The fiber collimator produced by THORLABS is fixed at the opening of the front panel, and pumping light and detection light output by the laser enter the inside of the magnetometer probe through the coupling collimation irradiation of the fiber and the fiber collimator. The lower part of the front panel side is provided with a hole for leading out a signal output cable of the optical detection differential circuit. The rear panel of the probe shell is provided with a through hole for leading out a radio frequency coil and a heating wire power supply cable of a heating assembly.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pumping-detection type atomic magnetometer probe structure is characterized by mainly comprising a first light path adjusting component, a second light path adjusting component, a third light path adjusting component, an absorption bubble (5), a heating module (4), a radio frequency coil component (6), a photoelectric detector and a differential amplifying circuit (11);
the heating module (4) is used for heating the absorption bubble (5) to evaporate alkali metal atoms in the absorption bubble (5) into gas, so that the density of alkali metal atom vapor in the absorption bubble (5) is ensured to meet the working condition of an atom magnetometer;
the radio frequency coil assembly (6) is used for generating a radio frequency magnetic field, so that the magnetic moment of the polarized alkali metal atoms precesses to a plane vertical to the external magnetic field, and the magnetic moment performs Larmor precession free relaxation around the external magnetic field;
the first optical path adjusting component adjusts the detection light into linearly polarized light, the linearly polarized light irradiates the absorption bubble (5) from one side, and the detection light is emitted from the absorption bubble (5) after interacting with atoms in the alkali metal gas in the absorption bubble (5);
the second optical path adjusting component adjusts pumping light emitted by the laser into circularly polarized light, the circularly polarized light irradiates the glass absorption bubble (5) from the side wall, and the polarization of alkali metal atoms in the absorption bubble (5) is realized through the optical pumping action; the third light path adjusting component divides the detection light emitted by the absorption bubble (5) into two vertical paths, namely s light and p light, which are respectively received by different photoelectric detectors, the differential amplifying circuit (11) receives light signals received by the two photoelectric detectors, the light signals are sent to the electronic processing unit at the rear end after differential amplification, and the external magnetic field value is calculated.
2. A pump-test type atomic magnetometer probe structure according to claim 1 wherein said first optical path adjusting means comprises a first quarter wave plate (1), a first polarizing beam splitter (2), a first mirror (3); the second optical path adjusting component comprises a third half-wave plate (12), a third polarization beam splitter (13) and a quarter-wave plate (14); the third optical path adjusting component comprises a second reflecting mirror (7), a second half wave plate (8), a second polarizing beam splitter (9) and a third reflecting mirror (10);
one path of laser emitted by the laser is adjusted into linearly polarized light through the first one-half wave plate (1) and the first polarization spectroscope (2) and used as detection light, and the linearly polarized light is reflected into the absorption bubble (5) through the first reflector (3);
the other path of laser emitted by the laser is adjusted into linearly polarized light through a third half-wave plate (12) and a third polarization spectroscope (13), then the linearly polarized light is changed into circularly polarized light through a quarter-wave plate (14) and is used as pumping laser to irradiate from the side wall of the absorption bubble (5);
the detection light is reflected by a second reflecting mirror (7) after interacting with alkali metal atoms in the absorption bubble (5), and then is divided into two beams, namely s light and p light, by a second polarizing beam splitter (9).
3. A pump-test type atomic magnetometer probe structure according to claim 2 wherein the third optical path adjusting assembly further comprises a second half wave plate (8) disposed in front of the second polarization beam splitter (9) for adjusting the magnitude of the signals received by the two photodetectors.
4. A pumping-detecting type atomic magnetometer probe structure according to claim 1 wherein said absorption bubble (5) is formed by processing a cylindrical transparent glass; the thermistor is adhered to the outer wall of the glass of the absorption bulb (5), the temperature of the absorption bulb (5) is measured through the thermistor, and the working power of the heating module (4) is fed back and controlled to realize constant temperature control.
5. The pumping-detection type atomic magnetometer probe structure according to claim 1, wherein the radio frequency coil assembly (6) comprises an upper disc and a lower disc, a groove is formed in the waist line of each disc, and enameled wires are uniformly wound in the grooves of the upper disc and the lower disc to form a radio frequency coil; the winding directions of the upper coil and the lower coil are the same, and the number of turns of the upper coil and the lower coil is the same; the absorption bubble (5) and the heating component are fixed between the upper disc and the disc.
6. A pumping-detecting type atomic magnetometer probe structure according to claim 1 wherein said heating module (4) comprises two cylindrical structures, the surfaces of which are tightly wound with twisted pairs and are heated by ac current; an absorbent blister (5) is placed between the two cylindrical structures.
7. The probe structure of a pumping-detection type atomic magnetometer according to claim 1, further comprising a wave plate fixing component for fixing a wave plate, wherein the wave plate fixing component is made of a nonmagnetic metal material and comprises two parts, namely a supporting seat and a fixing frame; the supporting seat is provided with a square groove capable of accommodating the fixing frame, and mounting holes are formed in corresponding positions of the supporting seat and the fixing frame and fixed together through screws; a circular groove is formed in the middle of the groove of the supporting seat, a circular through hole is formed in the bottom of the groove, and a circular through hole is formed in the middle of the fixing frame; the wave plate is placed in circular recess, and circular through-hole is used for leading to light, and the mount is fixed in square recess to pass through the screw fastening.
8. The structure of a pumping-sensing atomic magnetometer probe according to claim 7 wherein the circular groove has two through slots at its edge.
9. A pumping-detecting type atomic magnetometer probe structure according to claim 1 wherein the mirror fixing assembly is made of nonmagnetic metal material and comprises a mirror frame (15), a back plate (16) and a base (17) which are fixed together by gluing; the reflector is adhered to the reflector frame (15), the upper end of the reflector is provided with a threaded hole, and the fine adjustment of the laser reflection direction can be realized by adjusting the distance between the reflector frame (15) and the back plate (16) through screws.
10. The pumping-detection type atomic magnetometer probe structure according to claim 1, further comprising a closed probe housing, wherein the first optical path adjusting component, the second optical path adjusting component, the third optical path adjusting component, the absorption bulb (5), the heating module (4), the radio frequency coil component (6), the photodetector and the differential amplifying circuit (11) are fixed in the probe housing; the probe shell is made of black polyformaldehyde materials.
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