CN110646752A - An integrated head device of SERF atomic magnetometer - Google Patents

Abstract

The invention discloses an integrated gauge outfit device of an SERF atomic magnetometer, aiming at the requirements of optical excitation detection and high-temperature heating required by an SERF magnetometer gauge outfit air chamber, key components such as excitation, detection, heating, heat insulation and the like are integrally designed, the excitation light and the detection light are incident in parallel through an adjustable reflector structure to greatly reduce the gauge outfit volume, and components around an alkali metal air chamber are fixed by utilizing a close fit structure, so that the SERF magnetometer gauge outfit volume is reduced, the debugging efficiency of an excitation and detection device is improved, and the heat conduction of a heating device and the external environment is reduced. The invention provides a gauge head device with high reliability and high stability for the measurement research of a miniaturized SERF magnetometer array and an SERF magnetic field.

Description

An integrated head device of SERF atomic magnetometer

technical field

The invention belongs to the field of atomic magnetometers, in particular to an integrated head device of a SERF (Spin-Exchange-Relaxation-Free, no spin exchange relaxation) magnetometer.

Background technique

The ultra-sensitive extremely weak magnetic measurement device based on the SERF atomic spin effect has achieved a magnetic field measurement sensitivity better than 0.1fT/Hz ^1/2 , and is developing towards the aT (10 ^-18 T) level. Ultra-high sensitivity and extremely weak magnetic measurement has great application prospects in the fields of measurement benchmarks, brain science and medicine, and material science. At present, the most sensitive polar magnetic field measurement device is still in the stage of experimental research platform, and a miniaturized SERF magnetic field is urgently needed. to promote its rapid development in related fields. The SERF magnetometer head device is the core of the SERF magnetometer, and it is also a key factor affecting its overall volume and measurement indicators. In order to realize the SERF state of the alkali metal gas, it is necessary to provide a high-temperature non-magnetic environment for the glass gas cell carrying the alkali metal gas. At the same time, the judgment of the gas SERF state depends on the laser excitation and detection technology. At present, the magnetic shielding material is difficult to miniaturize due to the limitation of the processing technology. Therefore, the larger volume of the magnetic shield is often placed outside the meter device. Therefore, the meter device needs to reduce the magnetic field generated by itself as much as possible under the condition of maintaining high temperature. noise. The SERF magnetometer head includes key components such as air chamber, oven, heating film, heat insulation layer and window. The traditional head device designs and installs these key components independently, resulting in a complex structure of the head device. The volume is large, and there is a lack of organic cooperation between the device components. For example, SERF magnetometers often use the excitation light and detection light to be perpendicular to the optical path layout, resulting in the excitation laser and detection laser must be located in different directions of the SERF magnetometer and placed vertically, which greatly limits the volume of the SERF magnetometer. Further reduction affects the miniaturization application of the device.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems of large volume and loose structure of the existing SERF magnetometer head device, and propose an integrated SERF magnetometer head device, which reduces the volume of the SERF magnetometer head and reduces the excitation light path. And detection optical path optical path, enhance the degree of coordination and stability of the components of the meter head, and provide a compact and arrayable meter head device for the miniaturization of SERF magnetometer applications.

The object of the present invention is achieved through the following technical solutions:

An integrated head device of a SERF atomic magnetometer is characterized in that, the device comprises a reflector part, a base and a shell, a heat insulation layer, an oven and an air chamber which are nested in sequence from the outside to the inside. It is fixedly connected with the base, and the corresponding positions of the two opposite surfaces of the outer shell, the heat insulating layer and the oven are provided with through holes, which form an excitation light path with the air chamber, and the oven is parallel to the excitation light path. A heating film is set on the two sides of the outer casing, the corresponding positions of the outer shell, the heating film, the heat insulation layer and the oven are provided with through holes, which form a detection light path with the air chamber; the excitation light path and the detection The light path is vertical; the surface of the heating film is provided with a temperature sensor, the entrance and exit of the excitation light path and the detection light path are provided with windows, the oven, the heating film, the temperature sensor, the heat insulation layer, the window Sheets form a heating and thermal insulation structure;

There are two mirror parts, both of which are fixed on the casing, and are respectively located at both ends of the detection light path;

The gas in the gas chamber is an alkali metal gas, and the alkali metal gas works in a SERF state.

Further, the mirror part includes a mirror frame fixing block, a mirror frame, an adjustment knob, a mirror, and a screw rod, the mirror frame fixing block is fixed on the outer shell, and the mirror frame is located on the mirror frame fixing block. In between, there are mutually perpendicular through holes in the mirror frame, the mirror is fixed on the mirror frame at a direction of 45° relative to the detection light path, and in actual use, the mirror and the detection can be fine-tuned by adjusting the knob and the screw light angle to ensure that the detection light is collimated.

Each mirror frame is equipped with two matching adjustment knobs, which can realize the fine adjustment of the two degrees of freedom of the mirror to ensure the collimation of the detection light path.

Further, the alkali metal gas is any one or both of potassium, rubidium and cesium.

Further, the heating film is made of non-magnetic nickel-chromium material and has a twisted pair and a symmetrical structure processed by PCB technology, and each of the heating films is a double-layer paired structure.

Further, the oven is made of boron nitride material.

Further, the heat insulating layer is made of aerogel material.

Further, the windows are coated with anti-reflection coating materials corresponding to alkali metal atoms.

Further, the shell is made of polyether ether ketone material.

Further, the reflector adopts a dielectric film reflector.

Further, the entire watch head device is made of non-magnetic material.

The beneficial effects of the present invention are as follows:

(1) The present invention comprehensively considers the functions and working requirements of each device, and integrates the design of the air chamber, oven, heating film, heat insulation layer, shell and other device components, and realizes the integrated head device through the close cooperation of each device component. assembly.

(2) By designing the adjustable mirror structure in the header device, the conditional detection light can be collimated efficiently and quickly, and the SERF magnetometer function can be realized when the detection laser and the excitation laser are installed in parallel, which can greatly reduce the cost of SERF magnetometer volume.

(3) In the present invention, heat insulation and antireflection windows are installed at both ends of the excitation light path and the detection light path, which can reduce the heat dissipation of the core of the meter to the outside while ensuring the transmittance of the excitation light and the detection light. In addition, a temperature sensor is installed on the outside of the heating film to observe the temperature change of the meter head in real time.

(4) The present invention has compact structure, low operation requirements, low requirements for SERF magnetometer accessories, and provides a stable low-noise high-temperature environment for maintaining the SERF state of alkali metal gas.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments;

Fig. 1 is the front view of the integrated meter head device of a kind of SERF atomic magnetometer of the present invention;

Fig. 2 is a sectional view of the B-B section of the integrated head device of a SERF atomic magnetometer of the present invention;

3 is a partial cross-sectional view of the A-A section of the integrated head device of a SERF atomic magnetometer of the present invention;

Fig. 4 is the heating film structure diagram of the integrated head device of a SERF atomic magnetometer of the present invention;

In the figure, the air chamber 1, the oven 2, the heat insulation layer 3, the outer casing 4, the mirror part 5, the base 6, the heating film 7, the temperature sensor 8, the window sheet 9, the mirror frame fixing block 51, the mirror frame 52, the adjustment The knob 53 , the mirror 54 , the screw 55 , the heating film substrate 71 , the heating film through hole 72 , the copper wire 73 , and the power supply connector 74 .

Detailed ways

The present invention will be described in detail below according to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in Figures 1-3, the integrated head device of the SERF atomic magnetometer of the present invention includes a reflector part 5, a base 6, a shell 4, a heat insulation layer 3, and an oven 2 nested in sequence from outside to inside , the air chamber 1, the outer casing 4 and the base 6 are fixedly connected, and the corresponding positions of the two opposite faces of the outer casing 4, the heat insulation layer 3 and the oven 2 are provided with through holes, which are connected with the air chamber. 1 constitutes an excitation light path, the oven 2 is provided with a heating film 7 on two surfaces parallel to the excitation light path, and the air chamber 1 and the heating film 10 are respectively fixed on the inner and outer sides of the oven 2 with high temperature glue, and the outer shell 4 , the corresponding positions of the heating film 7, the heat insulation layer 3 and the oven 2 are provided with through holes, which form a detection light path with the air chamber 1; the excitation light path and the detection light path are vertical; the heating film The surface of 7 is provided with a temperature sensor 8, the entrance and exit of the excitation light path and the detection light path are provided with windows 9, the oven 2, the heating film 7, the temperature sensor 8, the heat insulation layer 3, the windows 9 Form heating and thermal insulation structure;

There are two mirror parts 5, both of which are fixed on the casing 4, and are respectively located at both ends of the detection light path;

The gas in the gas chamber 1 is an alkali metal gas, which can be one of potassium, rubidium, and cesium. At the same time, the alkali metal gas is kept in the SERF state through the head heating structure and the external magnetic shielding system.

The mirror part 5 includes a mirror frame fixing block 51, a mirror frame 52, an adjustment knob 53, a mirror 54, and a screw 55. The mirror frame fixing block 51 is fixed on the housing 4, and the mirror frame 52 is located at the Between the mirror frame fixing blocks 51, the mirror frame 52 is provided with through holes that are perpendicular to each other, the mirror 54 adopts a dielectric film mirror, and the mirror 54 is fixed on the mirror frame at a direction of 45° relative to the detection light path. 52, and in actual use, the angle between the mirror and the detection light can be fine-tuned by adjusting the knob 53 and the screw 55 to ensure the collimated incidence of the detection light.

Each mirror frame 51 is equipped with two matching adjustment knobs 53, which can realize two-degree-of-freedom fine-tuning of the mirror lens to ensure the collimation of the detection light path.

The heating film 7 is made of non-magnetic nickel-chromium material and processed with a twisted pair and symmetrical structure through PCB technology, and the magnetic field noise caused by electric heating is eliminated as much as possible by attaching the heating film to two layers. As shown in FIG. 4 , the heating film 7 is composed of a heating film substrate 71 and a copper wire 73. A heating film through hole 72 is dug in the center of the heating film substrate 71. The copper wire 73 is routed in a twisted pair form. 74 connections.

The temperature sensor 8 is attached to the outside of the heating film 7, and its wiring is connected to the electrical interface of the base 6 together with the heating film power supply line, thereby detecting and controlling the core temperature of the meter head in real time. The oven 2 is made of boron nitride material, which together with the heating film 7 provides the alkali metal gas in the gas chamber 1 with a high temperature environment required for the SERF state. The thermal insulation layer 3 uses aerogel material to insulate the heating device, reduces the heat dissipation inside the meter head and prevents the temperature of the reflector and the measured object from being too high. To ensure the thermal insulation effect, paste 2-3 according to the air chamber temperature requirements. layer of aerogel.

The window 9 is coated with an anti-reflection film material corresponding to alkali metal atoms, which is used to isolate the heat dissipation from the external environment of the meter head. The entire watch head device is fixed by screws 12, and the watch head device can be arranged in an array according to this fixing method.

The housing 4 is made of PEEK material, and is fixed with other SERF magnetometer supporting devices by screws 12 .

The entire head unit is made of non-magnetic material.

Those of ordinary skill in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still understand the Modifications are made to the technical solutions described in the foregoing examples, or equivalent replacements are made to some of the technical features. All modifications and equivalent replacements made within the spirit and principle of the invention shall be included within the protection scope of the invention.

Claims (10)

1. the integrated meter head device of a SERF atomic magnetometer, is characterized in that, this device comprises reflector part (5), base (6) and shell (4) nested successively from outside to inside, thermal insulation. The layer (3), the oven (2), the air chamber (1), the outer shell (4) and the base (6) are fixedly connected, the outer shell (4), the heat insulation layer (3), the oven (2) Through holes are provided at the corresponding positions of the two opposite faces of the radiator, forming an excitation light path with the air chamber (1), and a heating film ( 7), the corresponding positions of the casing (4), the heating film (7), the heat insulation layer (3), and the oven (2) are all provided with through holes, which form a detection light path with the air chamber (1). The described excitation light path and the detection light path are vertical; the surface of the described heating film (7) is provided with a temperature sensor (8), and the entrance and the exit of the described excitation light path and the detection light path are provided with windows (9). ), described oven (2), heating film (7), temperature sensor (8), heat insulation layer (3), window sheet (9) form heating and heat insulation structure; There are two mirror parts (5), both of which are fixed on the casing (4), and are respectively located at both ends of the detection light path; The gas in the gas chamber (1) is an alkali metal gas, and the alkali metal gas works in a SERF state. 2. the integrated meter head device of SERF atomic magnetometer according to claim 1, is characterized in that, mirror part (5) comprises mirror frame fixing block (51), mirror frame (52), adjustment knob ( 53) and the mirror (54) and the screw (55), the mirror frame fixing block (51) is fixed on the outer casing (4), and the mirror frame (52) is located on the mirror frame fixing block ( 51), mutually perpendicular through holes are opened in the reflector frame (52), the reflector is fixed on the reflector frame (52) at a direction of 45° relative to the detection light path, and can be adjusted in actual use. The knob (53) and the screw (55) fine-tune the angle between the reflector and the detection light to ensure that the detection light is incident collimated. Each mirror frame (51) is equipped with two matching adjustment knobs (53), which can realize the fine adjustment of the two degrees of freedom of the mirror to ensure the collimation of the detection optical path. The mirror frame (52) is connected to the mirror frame fixing block (51). The shell (4) is fixedly connected. 3. The integrated meter head device of SERF atomic magnetometer according to claim 1, wherein the alkali metal gas is any one or both of potassium, rubidium and cesium. 4. the integrated meter head device of SERF atomic magnetometer according to claim 1, is characterized in that, described heating film (7) adopts non-magnetic nickel-chromium material and processes twisted pair and symmetrical structure by PCB technology, And each of the heating films (7) is a double-layer opposite-sticking structure. 5. The integrated meter head device of SERF atomic magnetometer according to claim 1, characterized in that, the oven (2) is made of boron nitride material. 6 . The integrated head device of SERF atomic magnetometer according to claim 1 , characterized in that, the heat insulating layer ( 3 ) is made of aerogel material. 7 . 7. The integrated meter head device of the SERF atomic magnetometer according to claim 1, characterized in that, the windows (9) are coated with anti-reflection film materials corresponding to alkali metal atoms. 8. The integrated meter head device of SERF atomic magnetometer according to claim 1, characterized in that, the shell (4) is made of polyether ether ketone material. 9 . The integrated head device of SERF atomic magnetometer according to claim 1 , characterized in that, the reflector adopts a dielectric film reflector. 10 . 10 . The integrated head device of the SERF atomic magnetometer according to claim 1 , wherein the entire head device is made of non-magnetic material. 11 .

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