CN110986910A - Laser gyroscope light combining device for reducing stress effect - Google Patents
Laser gyroscope light combining device for reducing stress effect Download PDFInfo
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- CN110986910A CN110986910A CN201911201178.1A CN201911201178A CN110986910A CN 110986910 A CN110986910 A CN 110986910A CN 201911201178 A CN201911201178 A CN 201911201178A CN 110986910 A CN110986910 A CN 110986910A
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- 230000000694 effects Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims 2
- 230000002411 adverse Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/66—Ring laser gyrometers
- G01C19/661—Ring laser gyrometers details
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
Abstract
The invention discloses a laser gyro light combining device for reducing stress effect, which belongs to the field of laser gyros and has the technical scheme that the device comprises a light combining prism, wherein the light combining prism is bonded on a reflector of a laser gyro annular resonant cavity through a bonding end surface and is used for carrying out light combining interference on two laser beams which are transmitted clockwise and anticlockwise in the laser gyro annular resonant cavity; the semi-transparent and semi-reflective film is plated on the bonding end face and used for reducing the loss of laser beams, and the auxiliary film is also plated on the bonding end face to reduce bonding stress; wherein, the thickness of the auxiliary film is equal to that of the semi-transparent semi-reflective film; and the photodiode is bonded on the emergent end face of the light combination prism and is used for detecting interference signals generated by two laser beams which are transmitted in the annular resonant cavity of the laser gyroscope along the clockwise direction and the anticlockwise direction. An auxiliary film with the same thickness as the semi-transparent and semi-reflective film is plated on the periphery of the bonding end face of the light-combining prism so as to reduce the conditions of high center and low periphery of the bonding end face and further reduce the stress effect caused by end face deformation during bonding.
Description
Technical Field
The invention relates to the technical field of laser gyroscopes, in particular to a laser gyroscope light combining device for reducing stress effect.
Background
The laser gyro measures rotation by using the frequency difference between two laser beams propagating in opposite directions in the annular resonant cavity. Two laser beams propagating in opposite directions in the ring resonator need to pass through the optical combining device to generate a beat signal representing the frequency difference. The light combining device is a key component of a signal reading system of the laser gyro and generally consists of a light combining prism and a photodiode. The light combining prism is generally bonded on a reflector of the ring-shaped resonant cavity by a light glue method, the ring-shaped resonant cavity outputs two laser beams in the clockwise direction and the anticlockwise direction through the reflector, the light combining prism enables the two output laser beams in the clockwise direction and the anticlockwise direction to interfere to generate interference fringes, and then the movement of the interference fringes is detected by a photodiode to obtain the rotation angular displacement or the angular velocity measured by the laser gyroscope. In order to reduce the loss of the laser beam when passing through the light combination prism, a semi-transparent and semi-reflective film with a certain transmittance and a small area is generally plated at the position where the laser beam passes on the end surface where the light combination prism is bonded with the resonant cavity reflector.
The transflective film on the bonded end face of the light-combining prism used in the conventional light-combining device is generally composed of a small-area rectangle or circle located at the center of the bonded end face. Because the semi-transparent semi-reflecting film in the center of the bonding end face has non-negligible thickness, when the light-combining prism is bonded with the annular resonant cavity reflector, the surface bonding with high center and low periphery can generate stress on the light-combining prism, the annular resonant cavity and the reflector, thereby influencing the precision of the annular resonant cavity and the stability of the light-combining device, and further generating adverse effect on the performance of the laser gyro.
Therefore, a laser gyro light combining device for reducing stress effect is provided.
Disclosure of Invention
The present invention is directed to a laser gyro light combining device for reducing stress effect, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides a laser gyroscope light combining device for reducing stress effect, which comprises a light combining prism, a light source and a light source, wherein the light combining prism is bonded on a reflector of a laser gyroscope annular resonant cavity through a bonding end face and is used for carrying out light combining interference on two laser beams which are transmitted clockwise and anticlockwise in the laser gyroscope annular resonant cavity; the bonding end face is plated with a semi-transparent and semi-reflective film for reducing the loss of laser beams, and the bonding end face is also plated with an auxiliary film for reducing bonding stress; wherein the thickness of the auxiliary film is equal to that of the semi-transparent semi-reflective film; and the photodiode is bonded on the emergent end face of the light combination prism and is used for detecting interference signals generated by two laser beams which are transmitted in the annular resonant cavity of the laser gyroscope along the clockwise direction and the anticlockwise direction.
Further, the auxiliary films comprise a first auxiliary film, a second auxiliary film, a third auxiliary film and a fourth auxiliary film, and the first auxiliary film, the second auxiliary film, the third auxiliary film and the fourth auxiliary film are plated at the peripheral corners of the bonding end face.
Further, the semi-transparent semi-reflective film is a high-reflective film with the concentration of 200 ppm.
Furthermore, the light-combining prism is bonded on a reflector of the ring-shaped resonant cavity of the laser gyroscope by an optical cement method.
By applying the technical scheme of the invention, the beneficial effects are as follows: according to the laser gyro light combination device for reducing the stress effect, the auxiliary film with the same thickness as the semi-transparent and semi-reflective film with the small area at the central position of the bonding end face is plated on the periphery of the bonding end face of the light combination prism so as to reduce the conditions of high center and low periphery of the bonding end face, further reduce the stress effect caused by end face deformation during bonding and achieve the purpose of reducing the adverse effect of the stress effect of the light combination device on the performance of a laser gyro.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a structure of a light combining device in a laser gyro;
FIG. 2 is a schematic diagram of an adhesive end face of a light-combining prism of a conventional light-combining device;
fig. 3 is a schematic diagram showing an adhesive end surface of a light-combining prism of the light-combining device according to the present invention.
Wherein the figures include the following reference numerals:
10. a laser gyro ring-shaped resonant cavity; 20. a mirror; 30. a light-combining prism; 31. bonding end faces; 32. a semi-permeable and semi-reflective film; 33a, a first auxiliary film; 33b, a second auxiliary film; 33c, a third auxiliary film; 33d, a fourth auxiliary film; 40. a photodiode.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to fig. 3, the present invention provides a laser gyro light combining device for reducing stress effect, which includes a light combining prism 30 bonded on a reflector 20 of a laser gyro ring resonator 10 through a bonding end face 31, and is used for performing light combining interference on two laser beams propagating clockwise and counterclockwise in the laser gyro ring resonator 10; the bonding end face 31 is plated with a semi-transparent and semi-reflective film 32 for reducing the loss of laser beams, and the bonding end face 31 is also plated with an auxiliary film for reducing bonding stress; wherein, the thickness of the auxiliary film is equal to that of the semi-transparent and semi-reflective film 32; and the photodiode 40 is bonded on the emergent end face of the light combining prism 3 and is used for detecting interference signals generated by two laser beams which are transmitted in the clockwise direction and the anticlockwise direction in the ring-shaped resonant cavity 10 of the laser gyro.
By applying the technical scheme of the embodiment, two laser beams which are output by the ring resonator 10 of the laser gyro and propagate clockwise and counterclockwise enter the light-combining prism 30 from the bonding end face of the reflector 20 and the light-combining prism 30, form light-combining interference after multiple reflections, enter the photodiode 40 from the exit end face of the light-combining prism 30, the photodiode 40 outputs a photocurrent signal with a frequency consistent with the frequency difference of the two laser beams clockwise and counterclockwise by sensing the light-combining interference signal, the position on the bonding end face 301 of the light-combining prism 30 where the two laser beams clockwise and counterclockwise pass is plated with a semi-transparent and semi-reflective film 302 with a certain transmittance to reduce the loss generated when the laser beams pass, the periphery of the bonding end face 31 of the light-combining prism 30 is plated with an auxiliary film with the same thickness as the small-area semi-transparent and semi-reflective film 32 at the central position of the bonding end face 31 to reduce the high height, low thickness, and the stress effect caused by end face deformation during bonding is reduced under the condition of low periphery, so that the aim of reducing the adverse effect of the stress effect of the light combining device on the performance of the laser gyroscope is fulfilled.
Specifically, the light-combining prism 30 is bonded to the reflector 20 of the ring resonator 10 of the laser gyroscope by an optical cement method, so that the influence of the cement on the laser reflection can be avoided.
As shown in fig. 3, the auxiliary films include a first auxiliary film 33a, a second auxiliary film 33b, a third auxiliary film 33c, and a fourth auxiliary film 33d, and the first auxiliary film 33a, the second auxiliary film 33b, the third auxiliary film 33c, and the fourth auxiliary film 33d are plated at the peripheral corners of the bonded end surface 31.
Alternatively, the transflective film 32 is a high-reflective film of 200 ppm.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (4)
1. A laser gyro light combining device for reducing stress effect is characterized in that: comprises that
The light-combining prism (30) is bonded on the reflector (20) of the laser gyro ring-shaped resonant cavity (10) through a bonding end face (31) and is used for performing light-combining interference on two laser beams which are transmitted clockwise and anticlockwise in the laser gyro ring-shaped resonant cavity (10);
the bonding end face (31) is plated with a semi-transparent and semi-reflective film (32) for reducing the loss of laser beams, and the bonding end face (31) is also plated with an auxiliary film for reducing bonding stress;
wherein the thickness of the auxiliary membrane is equal to that of the semi-transparent and semi-reflective membrane (32);
and the photodiode (40) is bonded on the emergent end face of the light-combining prism (30) and is used for detecting interference signals generated by two laser beams which are transmitted in the clockwise direction and the anticlockwise direction in the ring-shaped resonant cavity (10) of the laser gyro.
2. The laser gyro light combining device for reducing stress effect according to claim 1, wherein: the auxiliary films comprise a first auxiliary film (33a), a second auxiliary film (33b), a third auxiliary film (33c) and a fourth auxiliary film (33d), and the first auxiliary film (33a), the second auxiliary film (33b), the third auxiliary film (33c) and the fourth auxiliary film (33d) are plated at the peripheral corners of the bonding end face (31).
3. The laser gyro light combining device for reducing stress effect according to claim 1, wherein: the semi-permeable and semi-reflective film (32) is a high-reflective film with the concentration of 200 ppm.
4. The laser gyro light combining device for reducing stress effect according to claim 1, wherein: and the light-combining prism (30) is bonded on the reflector (20) of the laser gyro ring-shaped resonant cavity (10) by a light glue method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911201178.1A CN110986910A (en) | 2019-11-29 | 2019-11-29 | Laser gyroscope light combining device for reducing stress effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911201178.1A CN110986910A (en) | 2019-11-29 | 2019-11-29 | Laser gyroscope light combining device for reducing stress effect |
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| Publication Number | Publication Date |
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| CN110986910A true CN110986910A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911201178.1A Withdrawn CN110986910A (en) | 2019-11-29 | 2019-11-29 | Laser gyroscope light combining device for reducing stress effect |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100046000A1 (en) * | 2008-08-19 | 2010-02-25 | Minebea Co., Ltd. | Semiconductor ring laser gyroscope |
| CN202284954U (en) * | 2011-09-29 | 2012-06-27 | 中国航空工业第六一八研究所 | Device for subdividing frequency of laser gyroscope |
| CN103674006A (en) * | 2012-09-07 | 2014-03-26 | 中国航空工业第六一八研究所 | Integrated light combination device and light combination method for laser gyroscope |
| CN106507911B (en) * | 2010-08-27 | 2014-04-23 | 中国航空工业第六一八研究所 | Laser gyro is without telescopic shaker mechanism |
| CN108227111A (en) * | 2018-01-27 | 2018-06-29 | 西安应用光学研究所 | A kind of method for reducing aspherical heavy caliber hollow reflective mirror adhesive stress |
-
2019
- 2019-11-29 CN CN201911201178.1A patent/CN110986910A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100046000A1 (en) * | 2008-08-19 | 2010-02-25 | Minebea Co., Ltd. | Semiconductor ring laser gyroscope |
| CN106507911B (en) * | 2010-08-27 | 2014-04-23 | 中国航空工业第六一八研究所 | Laser gyro is without telescopic shaker mechanism |
| CN202284954U (en) * | 2011-09-29 | 2012-06-27 | 中国航空工业第六一八研究所 | Device for subdividing frequency of laser gyroscope |
| CN103674006A (en) * | 2012-09-07 | 2014-03-26 | 中国航空工业第六一八研究所 | Integrated light combination device and light combination method for laser gyroscope |
| CN108227111A (en) * | 2018-01-27 | 2018-06-29 | 西安应用光学研究所 | A kind of method for reducing aspherical heavy caliber hollow reflective mirror adhesive stress |
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Application publication date: 20200410 |