Light path and light height adjusting device and method for SERF atomic spin gyroscope

Abstract

The invention relates to a light path and light height adjusting device and method for an SERF atomic spin gyroscope, the light path and light height adjusting device comprises a to-be-adjusted light module, a semitransparent observation screen and a right-angle reflecting prism, and high-precision and high-efficiency adjustment of the light height of a pumping and detection light path of the SERF atomic spin gyroscope can be realized. According to the adjusting method, the right-angle reflecting prism installed in parallel with the optical platform is used for reflecting and shifting light beams emitted by the optical module to be adjusted, and the semitransparent observation screen with horizontal scales is installed between the right-angle reflecting prism and the optical module. In the light height adjusting process, the positions of light spots at the near end and the far end can be observed on the semitransparent observation screen at the same time, the step that measurement needs to be conducted at the two ends again after each time of adjustment in a traditional method is omitted, one-time continuous adjustment can be achieved, and the adjusting work efficiency is greatly improved; due to the fact that the reflection light path is added, the distance between the near end and the far end is doubled, and the light height adjusting precision is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of inertial measurement sensors, and in particular to an optical path and optical height adjustment device and an adjustment method for a SERF atomic spin gyroscope. Background Art

[0002] So far, many countries have developed various types of spin exchange relaxation free (Spin ExchangeRelaxation Free-SERF) atomic spin gyroscope principle verification systems, and some companies are already in the engineering stage. In 2005, Princeton University used the K-3He atomic source to verify the SERF atomic spin inertial measurement principle for the first time, and completed the second-generation SERF gyroscope experimental device in 2011. The American TWINLEAF company has received strong support from the US Department of Defense to conduct SERF gyroscope technology research, and the size of the meter head is less than Φ8cm*10cm. Beijing University of Aeronautics and Astronautics took the lead in conducting SERF gyroscope research in 2008, and research institutes such as the Beijing Institute of Aerospace Control Instruments have also carried out research and made great progress.

[0003] The SERF gyroscope makes comprehensive use of the electron spin of alkali metal atoms and the nuclear spin of inert gas. It increases the spin relaxation time by manipulating the electron spin of alkali metal atoms to work in the SERF state. It also controls the strong coupling between the nuclear spin of inert gas atoms and the electron spin of alkali metal atoms to compensate for changes in the external magnetic field and isolate the influence of the magnetic field, thereby improving measurement accuracy. When the carrier rotates, the atomic spin has a fixed axis. The detection laser is fixed to the carrier and rotates with the carrier. The angle between the detection laser and the spin reflects the rotation of the carrier relative to the inertial space.

[0004] The light heights of the pump light component and the detection light component must be strictly consistent and horizontal to ensure that the pump light and the detection light are perpendicular to each other and intersect when installed and debugged on the gyroscope; if the light heights are inconsistent, the pump light and the detection light cannot intersect, and the detection light cannot detect the effective spin polarization area, which leads to the degradation of the signal-to-noise ratio of the atomic spin gyroscope or even the disappearance of the signal. The traditional method of adjusting the light height is: set a reference line along the direction of the light beam on the optical platform, and then measure the height position of the light spot at the near end and the far end along the reference line with a height ruler, and adjust the reflector or reflector group on the optical module according to the height difference between the near end and the far end. After each adjustment, it is necessary to measure again at both ends. After repeated multiple times, the light beam is adjusted to a certain horizontal height. The farther the distance between the near end and the far end, the higher the adjustment accuracy. This method requires a larger optical platform and has low debugging efficiency.

[0005] like Figure 2As shown in the figure, the SERF gyroscope composition diagram, through the pump light (the linear polarized light output by the pump laser is converted into circular polarized light through a 1 / 4 wave plate) and the coil magnetic field to comprehensively control the atomic spin, the atomic spin polarization of the working material in the atomic gas chamber can be achieved. When the carrier rotates relative to the inertial space, the pump laser fixed to the carrier rotates with the carrier, and forces the atomic spin to precess in the direction of the pump laser. Since the detection laser (linear polarized light output by the detection light laser) is also fixed to the carrier and intersects with the pump light perpendicularly, the atomic spin precession in the area polarized by the pump light can be detected. When the carrier rotates relative to the inertial space, the angle between the detection laser and the atomic spin will also change. The size of the angle change reflects the size of the angular velocity. The detection laser will interact with the atomic spin. Different atomic spin directions will change the linear polarization direction of the detection laser. By detecting this change in linear polarization direction, the angular velocity can be measured.

[0006] From the working principle of SERF gyroscope, it can be known that pump light and detection light are the key components of SERF gyroscope, and the light heights of pump light and detection light must be strictly consistent and horizontal to ensure that the pump light and detection light are perpendicular and intersecting to each other during installation and debugging on the gyroscope, so as to realize the measurement of angular velocity; if the light heights are inconsistent, the pump light and detection light cannot intersect, and the detection light cannot detect the effective spin polarization area, which leads to the degradation of the signal-to-noise ratio of the atomic spin gyroscope or even the disappearance of the signal.

[0007] The method commonly used in the industry to adjust the light height is: set a reference line along the direction of the light beam on the optical platform, and then use a height gauge to measure the height position of the light spot at the near end and the far end along the reference line. Adjust the reflector or reflector group on the optical module according to the height difference between the near end and the far end light spot. After each adjustment, it is necessary to measure again at both ends. After repeated adjustments, the light beam is adjusted to a certain horizontal height. The farther the distance between the near end and the far end, the higher the adjustment accuracy. When the adjustment accuracy requirement is high, this method needs to extend the distance between the near end and the far end of the light beam as much as possible, and a larger optical platform must be used. It is necessary to repeatedly measure at the near end and the far end of the light beam, and the debugging efficiency is low.

[0008] In view of the above technical problems, an optical path and optical height adjustment device and adjustment method for a SERF atomic spin gyroscope are proposed. Summary of the invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an optical path light height adjustment device for a SERF atomic spin gyroscope, which can achieve high precision and high efficiency in the optical path light height adjustment work of the SERF atomic spin gyroscope.

[0010] The present invention also provides an adjustment method for an optical path and light height adjustment device for a SERF atomic spin gyroscope. Compared with the traditional light height adjustment method, it can realize the simultaneous observation of the far and near light spot positions, and double the actual distance between the far and near ends by increasing the reflected light path, thereby improving the adjustment work efficiency and further improving the adjustment accuracy.

[0011] The present invention solves the technical problem by the following technical solutions:

[0012] The invention discloses an optical path and light height adjustment device for a SERF atomic spin gyroscope, comprising an optical module to be adjusted, a semi-transparent observation screen and a right-angle reflection prism. The optical module to be adjusted emits a laser beam, and after the light beam passes through the transparent observation screen, it is vertically incident on the hypotenuse of the right-angle reflection prism. After the light beam is reflected twice by two right-angle edges, the transmission direction of the light beam turns 180 degrees, and the reflected light beam passes through the semi-transparent observation screen again to form a working optical path, so as to adjust the optical path and light height of the SERF atomic spin gyroscope.

[0013] Furthermore, the translucent observation screen is a translucent observation screen with horizontal scales.

[0014] A method for adjusting an optical path and optical height adjustment device for a SERF atomic spin gyroscope comprises the following steps:

[0015] S1. Fix the optical module to be adjusted on a horizontal optical platform and turn on the power of the optical module to be adjusted;

[0016] S2, the optical module to be adjusted emits a laser beam, which passes through a translucent observation screen;

[0017] S3, the light beam passing through the translucent observation screen is vertically incident on the hypotenuse of the right-angle reflecting prism;

[0018] S4, the light beam is reflected twice by two right-angle edges and its transmission direction turns 180°;

[0019] S5, the reflected light beam passes through the translucent observation screen again;

[0020] S6. The near-end and far-end light spots of the light beam to be adjusted are observed on the translucent observation screen at the same time. The actual light height and horizontal state of the light beam at this time are judged by observing the positions of the near-end and far-end light spots relative to the target height scale on the translucent observation screen. The reflector or reflector group on the light module to be adjusted is continuously adjusted. The positions of the near-end and far-end light spots on the translucent observation screen change during the adjustment process. The adjustment is completed when the near-end and far-end light spots are adjusted to the same target horizontal scale.

[0021] The advantages and positive effects of the present invention are:

[0022] 1. The optical path and light height adjustment device for the SERF atomic spin gyroscope of the present invention has a clear principle, a simple structure, a reasonable layout, and is easy to implement. It can achieve efficient and high-precision adjustment of the light height, is suitable for the optical path of the SERF gyroscope, and can also be used for other optical path related debugging.

[0023] 2. The adjustment method of the optical path light height adjustment device for the SERF atomic spin gyroscope of the present invention utilizes a right-angle reflection prism to complete the offset and reversal of the light beam to be adjusted, and at the same time, the distance between the near end and the far end is doubled without increasing the size of the table, thereby improving the light height adjustment accuracy.

[0024] 3. The adjustment method of the optical path light height adjustment device for the SERF atomic spin gyroscope of the present invention utilizes a semi-transparent observation screen between the optical module to be adjusted and the right-angle reflection prism to realize simultaneous observation of the near and far end light spot positions, thereby improving the efficiency of the light height adjustment work. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the principle of the optical path and light height adjustment device used for the SERF atomic spin gyroscope;

[0026] Figure 2 This is a schematic diagram of the SERF gyroscope composition;

[0027] In the figure:

[0028] 1. Shielding tube component; 2. Three-dimensional compensation coil; 3. Heating and heat preservation component; 4. Atomic gas chamber; 5. Detection light component; 6. Pump light component; 7. Signal receiving component; 8. Optical module to be adjusted; 9. Semi-transparent observation screen; 10. Right-angle reflecting prism. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0030] like Figure 1 , Figure 2As shown, a light path and light height adjustment device for SERF atomic spin gyroscope; comprising a light module 8 to be adjusted, a translucent observation screen 9 and a right-angle reflection prism 10, wherein the light module 8 to be adjusted emits a laser beam, and after the light beam passes through the transparent observation screen, it is vertically incident on the hypotenuse of the right-angle reflection prism 10, and the light beam is reflected twice by two right-angle edges and the transmission direction is turned 180°, and the reflected light beam passes through the translucent observation screen 9 again to form a working light path, and the light path and light height of the SERF atomic spin gyroscope are adjusted. The translucent observation screen 9 is a translucent observation screen 9 with a horizontal scale. Among them, the SERF atomic spin gyroscope comprises a light module 8 to be adjusted, a signal receiving component 7 and a core sensitive device, the light module 8 to be adjusted is a pump light component 6 or a detection light component 5, and the core sensitive device comprises a shielding tube component 1, a three-dimensional compensation coil 2, a heating and heat preservation component 3 and an atomic gas chamber 4.

[0031] The optical path height adjustment device of the present invention can realize high-precision and high-efficiency adjustment of the optical path height of the pump and detection optical paths of the SERF atomic spin gyroscope, has a simple structure, and is convenient to install and debug, and can greatly improve the debugging efficiency of the optical path of the SERF atomic spin gyroscope.

[0032] Working principle of the present invention:

[0033] Fix the optical module 8 to be adjusted on a horizontal optical platform, turn on the power of the optical module 8 to be adjusted, and the optical module 8 to be adjusted emits a laser beam. After passing through a translucent observation screen 9, the light beam is vertically incident on the hypotenuse of the right-angle reflecting prism 10. After two reflections by two right-angle edges, the transmission direction of the light beam turns 180°, and the reflected light beam passes through the translucent observation screen 9 again. At this time, the near-end and far-end light spots of the light beam to be adjusted can be observed on the translucent observation screen 9 at the same time. By observing the positions of the near-end and far-end light spots on the translucent observation screen 9 relative to the target height scale, the actual light height and horizontal state of the light beam at this time can be judged, and the reflector or reflector group on the optical module 8 to be adjusted is continuously adjusted. During the adjustment process, the positions of the near-end and far-end light spots on the translucent observation screen 9 change, and the adjustment work is completed when the near-end and far-end light spots are adjusted to the same target horizontal scale.

[0034] like Figure 1 As shown, a method for adjusting an optical path and optical height adjustment device for a SERF atomic spin gyroscope comprises the following steps:

[0035] S1, fix the optical module 8 to be adjusted on a horizontal optical platform, and turn on the power of the optical module 8 to be adjusted;

[0036] S2, the light module 8 to be adjusted emits a laser beam, which passes through the translucent observation screen 9;

[0037] S3, the light beam passing through the translucent viewing screen 9 is vertically incident on the hypotenuse of the right-angle reflecting prism 10;

[0038] S4, the light beam is reflected twice by two right-angle edges and its transmission direction turns 180°;

[0039] S5, the reflected light beam passes through the translucent observation screen 9 again;

[0040] S6. The near-end and far-end light spots of the light beam to be adjusted are observed on the translucent observation screen 9 at the same time. The actual light height and horizontal state of the light beam at this time are judged by observing the positions of the near-end and far-end light spots on the translucent observation screen 9 relative to the target height scale line. The reflector or reflector group on the light module 8 to be adjusted is continuously adjusted. During the adjustment process, the positions of the near-end and far-end light spots on the translucent observation screen 9 change. When the near-end and far-end light spots are adjusted to the same target horizontal scale line, the adjustment work is completed.

[0041] The light module to be adjusted 8, the translucent observation screen 9 and the right-angle reflection prism 10 constitute the working optical path. The light beam emitted by the light module to be adjusted is reflected and offset by the right-angle prism installed parallel to the optical platform, so that the distance between the near end and the far end is doubled, and at the same time, the conditions for observing the positions of the light spots before and after the reflection are created at one position. By using the translucent observation screen 9 with a horizontal scale, the positions of the light spots at the near end and the far end can be observed on the observation screen at the same time during the light height adjustment process, and whether the light height adjustment work is completed can be judged based on whether the positions of the two light spots are on a horizontal line of a certain height during adjustment.

[0042] Fix the optical module 8 to be adjusted on a horizontal optical platform, turn on the power of the optical module 8 to be adjusted, and the optical module 8 to be adjusted emits a laser beam. After passing through a translucent observation screen 9, the light beam is vertically incident on the hypotenuse of the right-angle reflecting prism 10. After two reflections by two right-angle edges, the transmission direction of the light beam turns 180°, and the reflected light beam passes through the translucent observation screen 9 again. At this time, the near-end and far-end light spots of the light beam to be adjusted can be observed on the translucent observation screen 9 at the same time. By observing the positions of the near-end and far-end light spots on the translucent observation screen 9 relative to the target height scale, the actual light height and horizontal state of the light beam at this time can be judged, and the reflector or reflector group on the optical module 8 to be adjusted is continuously adjusted. During the adjustment process, the positions of the near-end and far-end light spots on the translucent observation screen 9 change, and the adjustment work is completed when the near-end and far-end light spots are adjusted to the same target horizontal scale.

[0043] The optical path height adjustment device of the present invention can realize high-precision and high-efficiency adjustment of the optical path height of the pump and detection optical paths of the SERF atomic spin gyroscope, has a simple structure, and is convenient to install and debug, and can greatly improve the debugging efficiency of the optical path of the SERF atomic spin gyroscope.

[0044] The adjustment method of the present invention uses a right-angle reflection prism 10 installed parallel to the optical platform to reflect and offset the light beam emitted by the optical module to be adjusted, and a translucent observation screen 9 with a horizontal scale is installed between the right-angle reflection prism 10 and the optical module. Therefore, during the light height adjustment process, the near-end and far-end light spot positions can be observed on the translucent observation screen 9 at the same time, eliminating the step of re-measuring at both ends after each adjustment in the traditional method, and can achieve a continuous adjustment, greatly improving the adjustment work efficiency; due to the increase of the reflected light path, it is equivalent to doubling the distance between the near end and the far end, further improving the light height adjustment accuracy. The right-angle reflection prism 10 is used to complete the offset and reversal of the light beam to be adjusted, and the near-end and far-end distances are doubled without increasing the size of the table, creating conditions for observing the near-end and far-end light spots at the same position while improving the adjustment accuracy; the translucent observation screen between the light module 8 to be adjusted and the right-angle reflection prism 10 is used to achieve simultaneous observation of the near-end and far-end light spot positions, improving the light height adjustment work efficiency.

[0045] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An optical path and light height adjustment device for a SERF atomic spin gyroscope, characterized in that: The invention comprises an optical module to be adjusted, a semi-transparent observation screen and a right-angle reflection prism. The optical module to be adjusted emits a laser beam. After the light beam passes through the transparent observation screen, it is vertically incident on the hypotenuse of the right-angle reflection prism. After the light beam is reflected twice by two right-angle edges, the transmission direction of the light beam turns 180 degrees. The reflected light beam passes through the semi-transparent observation screen again to form a working optical path, so as to adjust the optical path and light height of the SERF atomic spin gyroscope.

2. The optical path and light height adjustment device for SERF atomic spin gyroscope according to claim 1, characterized in that: The translucent observation screen is a translucent observation screen with horizontal scales.

3. A method for adjusting the optical path and optical height adjustment device for a SERF atomic spin gyroscope as claimed in claim 1, characterized in that: The following steps are involved: S1. Fix the optical module to be adjusted on a horizontal optical platform and turn on the power of the optical module to be adjusted; S2, the optical module to be adjusted emits a laser beam, which passes through a translucent observation screen; S3, the light beam passing through the translucent observation screen is vertically incident on the hypotenuse of the right-angle reflecting prism; S4, the light beam is reflected twice by two right-angle edges and its transmission direction turns 180°; S5, the reflected light beam passes through the translucent observation screen again; S6. The near-end and far-end light spots of the light beam to be adjusted are observed on the translucent observation screen at the same time. The actual light height and horizontal state of the light beam at this time are judged by observing the positions of the near-end and far-end light spots relative to the target height scale on the translucent observation screen. The reflector or reflector group on the light module to be adjusted is continuously adjusted. The positions of the near-end and far-end light spots on the translucent observation screen change during the adjustment process. The adjustment is completed when the near-end and far-end light spots are adjusted to the same target horizontal scale.

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