CN103674006A - Integrated light combination device and light combination method for laser gyroscope - Google Patents
Integrated light combination device and light combination method for laser gyroscope Download PDFInfo
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- CN103674006A CN103674006A CN201210331210.XA CN201210331210A CN103674006A CN 103674006 A CN103674006 A CN 103674006A CN 201210331210 A CN201210331210 A CN 201210331210A CN 103674006 A CN103674006 A CN 103674006A
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- combining prism
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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
- G01C19/662—Ring laser gyrometers details signal readout; dither compensators
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Abstract
The invention belongs to the laser gyroscope technology, and relates to an integrated light combination device and a light combination method for a laser gyroscope. The integrated light combination device for the laser gyroscope comprises an integrated light combination prism (1), an optical mask plate (2) and a detector (3), wherein the optical mask plate is arranged on an output surface of the integrated light combination prism, the detector (3) is located on an output surface of the optical mask plate, the upper end surface of the integrated light combination prism (1) is provided with a tangential surface, and an intersection angle between the tangential surface and the lower end surface of the integrated light combination prism is phi which is about 30 degrees. The integrated light combination device is simple and compact in structure, convenient to process and install, easy to miniaturize, and especially applicable to a microminiature laser gyroscope with the cavity length less than 4cm. In addition, in light combination, the width of a moire fringe can meet the requirement of the detector by regulating the intersection angle between a mask fringe and an interference fringe, the requirements on the processing error of the angle phi of the light combination prism and the optical debugging error can be greatly reduced, and the practicability requirement of the microminiature laser gyroscope can be met.
Description
Technical field
The invention belongs to laser gyro technique, relate to the integrated Multiplexing apparatus of a kind of laser gyro and close light method.
Background technology
Multiplexing apparatus is the key components of RLG Signal read-out system, suitable, the counterclockwise light of conventional a slice laser gyro cavity catoptron output, by light-combining prism (as Fig. 1), make to export suitable, the counterclockwise interference of light, produce interference fringe, because laser gyro rotating speed is directly proportional to moving interference fringes speed, thereby survey moving interference fringes speed with photoelectric tube, obtain rotating speed that laser gyro is surveyed.
Yet existing Multiplexing apparatus and close light method and be generally applicable to large scale laser gyro, output reflector 13 in Multiplexing apparatus, light-combining prism 12, detector volume are larger, be difficult to miniaturization, and processing and location tolerance require high, cost is large, is difficult to meet the application requirements of the microminiature laser gyro of chamber length in 40mm.
Summary of the invention
The object of the invention is: provide a kind of compact conformation, volume little, process the integrated Multiplexing apparatus of laser gyro easy for installation.
In addition, the present invention also provides a kind of laser gyro the integrated light method of closing.
Technical scheme of the present invention is: the integrated Multiplexing apparatus of a kind of laser gyro, it comprises integrated light-combining prism, optical mask, detector, described optical mask is arranged on the output face of integrated light-combining prism, and detector is positioned in the output face of optical mask, wherein, the upper surface of described integrated light-combining prism has a tangent plane, and this tangent plane and integrated angle of cut φ scope of closing between light rib lower surface are 20 ° ~ 40 °.
Described integrated light-combining prism is rectangular parallelepiped or the right cylinder that upper surface has tangent plane.
The exit facet of described integrated light-combining prism is not less than 1/2 of former upper surface.
Tangent plane and the lower surface of described integrated light-combining prism are coated with reflectance coating.
The reflectance coating of described integrated light-combining prism lower surface is the high-reflecting film of 200ppm transmitance.
Optical mask is grating mask or the class grating mask at light and shade interval, and its transmission region and light tight region be alternative arrangement uniformly-spaced.
Utilize the integrated Multiplexing apparatus of laser gyro described in claim 1 to carry out the method that light is closed in laser gyro, it is characterized in that, comprise the steps,
Step 1: produce suitable, counterclockwise interference fringe
Suitable, the counterclockwise light of laser gyro enters integrated light-combining prism from integrated light-combining prism lower surface, and wherein, light is directly exported from upper surface clockwise, and light is exported from upper surface successively after tangent plane and lower surface reflection counterclockwise.There is angle of cut θ in this clockwise light and counterclockwise light, the two forms interference fringe;
Step 2: produce Moire fringe
At integrated light-combining prism exit facet, placing optical mask plate, there is angle α in mask striped and interference fringe, and interference fringe forms Moire fringe after mask plate modulation;
Step 3: adjust angle α and make D meet request detector;
When interference fringe moves to+directions X, Moire fringe will move to standard+Y-direction, and Moire fringe translational speed is directly proportional to moving interference fringes speed, the pass of Moire fringe width D and mask width of fringe L and angle α is D=L/ α again, therefore by adjusting the angle of optical mask plate, change angle α and make D meet request detector.
Technique effect of the present invention is: the integrated Multiplexing apparatus of the present invention is owing to adopting integrated light-combining prism, and it is simple and compact for structure, and integrated level is high, and processes easy for installationly, is easy to the realization of miniaturization, is specially adapted to the microminiature laser gyro that chamber length is less than 4cm.In addition, actual closing the light time, by the angle of cut of capable of regulating mask striped and interference fringe, can be so that Moire fringe width meets request detector, thereby greatly reduce the mismachining tolerance requirement of involutory smooth prism angle φ, and the optics of light-combining prism debugging error requirements, met the practicality requirement of microminiature laser gyro.
Accompanying drawing explanation
Fig. 1 is a kind of index path of prior art light-combining prism;
Fig. 2 is the structural representation of the integrated Multiplexing apparatus of laser gyro of the present invention;
Fig. 3 is the index path of the integrated light-combining prism of the present invention;
Fig. 4 is the schematic bottom view of the integrated light-combining prism of the present invention;
Fig. 5 is suitable, the counterclockwise interference of light striped of laser gyro schematic diagram;
Fig. 6 is class grating mask schematic diagram;
Fig. 7 is laser gyro Moire fringe schematic diagram;
Wherein, the integrated light-combining prism of 1-, 2-optical mask, 3-detector, 4-upper surface, 5-tangent plane, 6-lower surface, 8-high-reflecting film, the clockwise light of 10-, 11-is counterclockwise light, 12-prior art light-combining prism, 13-output reflector.
Embodiment
Below by embodiment, the present invention is described in further detail:
Refer to Fig. 2, it is the structural representation of the integrated Multiplexing apparatus of laser gyro of the present invention.The integrated Multiplexing apparatus of described laser gyro comprises integrated light-combining prism 1, optical mask 2, detector 3.Described optical mask is arranged on the output face of integrated light-combining prism, and detector 3 is positioned in the output face of optical mask.Wherein, optical mask is grating mask or the class grating mask at light and shade interval, and its transmission region and light tight region be alternative arrangement uniformly-spaced.Detector is the photodiode of two quadrant, for surveying the movement of interference fringe.
Refer to Fig. 3, it is the structural representation of integrated light-combining prism.Described integrated light-combining prism 1 is made by quartz glass, is the rectangular parallelepiped quartz wedge of unfilled corner, and its tangent plane 5 and the integrated angle of cut closing between light rib end face are φ, integrated light-combining prism excision end residual thickness is h, wherein, angle of cut φ scope is 20 ° ~ 40 °, and excision section residual thickness h is greater than original half.In present embodiment, the quartzy block length 10mm of rectangular parallelepiped, wide 8mm, high 3.5mm, φ is preferably 30 °.In addition, tangent plane 5 and the lower surface 6 of this integrated light-combining prism are all coated with reflectance coating, and wherein, the reflectance coating of lower surface 6 is the high-reflecting film 8 of 200ppm left and right transmitance, to guarantee that the light output under laser gyro low-loss meets detectable requirement.In addition, as shown in Figure 4, this integrated light-combining prism bottom surface is rectangle, therefore glues together area large, is beneficial to installation.
The integrated Multiplexing apparatus of the present invention is owing to adopting integrated light-combining prism, and it is simple and compact for structure, and integrated level is high, and processes easy for installationly, is easy to the realization of miniaturization, is specially adapted to the microminiature laser gyro that chamber length is less than 40mm.
During the actual use of the integrated Multiplexing apparatus of the present invention, suitable, the counterclockwise light of laser gyro enters integrated light-combining prism from integrated light-combining prism lower surface, wherein, light is directly exported from upper surface clockwise, and light is exported from upper surface successively after tangent plane and lower surface reflection counterclockwise.There is small angle of cut θ in this clockwise light and counterclockwise light, the two forms interference fringe.This interference fringe, by optical mask plate, forms Moire fringe after mask plate modulation.
Wherein, there is less angle α in mask striped and interference fringe, when interference fringe moves to+directions X, Moire fringe will move to standard+Y-direction, and Moire fringe translational speed is directly proportional to moving interference fringes speed, the pass of Moire fringe width D and mask width of fringe L and angle α is D=L/ α again, therefore, by adjusting the angle of optical mask plate, changes angle α and makes D meet request detector.Thereby greatly reduce the mismachining tolerance requirement of involutory smooth prism angle φ, and the optics of light-combining prism debugging error requirements.
In addition, the integrated Multiplexing apparatus of the present invention is not limited to the content that above-mentioned embodiment discloses, can be improved further on its basis, as integrated optics prism material is not limited to quartz glass, can is devitrified glass, K9 glass and is other transparent optical material.This integrated optics prism shape is also not limited to rectangular parallelepiped, can be also right cylinder, precisely because the tangent plane angle of cut meets actual optics requirement.
Claims (7)
1. the integrated Multiplexing apparatus of laser gyro, it is characterized in that, comprise integrated light-combining prism (1), optical mask (2), detector (3), described optical mask is arranged on the output face of integrated light-combining prism, and detector (3) is positioned in the output face of optical mask, wherein, the upper surface of described integrated light-combining prism (1) has a tangent plane, this tangent plane and the integrated angle of cut closing between light rib lower surface are φ, and this angle of cut φ scope is 20 ° ~ 40 °.
2. the integrated Multiplexing apparatus of laser gyro according to claim 1, is characterized in that, described integrated light-combining prism is rectangular parallelepiped or the right cylinder that upper surface has tangent plane.
3. the integrated Multiplexing apparatus of laser gyro according to claim 2, is characterized in that, the exit facet of described integrated light-combining prism is not less than 1/2 of former upper surface.
4. the integrated Multiplexing apparatus of laser gyro according to claim 3, is characterized in that, tangent plane and the lower surface of described integrated light-combining prism are coated with reflectance coating.
5. the integrated Multiplexing apparatus of laser gyro according to claim 4, is characterized in that, the reflectance coating of described integrated light-combining prism lower surface is the high-reflecting film of 200ppm transmitance.
6. according to the integrated Multiplexing apparatus of laser gyro described in claim 1 to 5 any one, it is characterized in that, optical mask is grating mask or the class grating mask at light and shade interval, and its transmission region and light tight region be alternative arrangement uniformly-spaced.
7. utilize the integrated Multiplexing apparatus of laser gyro described in claim 1 to carry out the method that light is closed in laser gyro, it is characterized in that, comprise the steps,
Step 1: produce suitable, counterclockwise interference fringe
Suitable, the counterclockwise light of laser gyro enters integrated light-combining prism from integrated light-combining prism lower surface, wherein, light is directly exported from upper surface clockwise, and light is exported from upper surface successively after tangent plane and lower surface reflection counterclockwise, there is angle of cut θ in this clockwise light and counterclockwise light, the two forms interference fringe;
Step 2: produce Moire fringe
At integrated light-combining prism exit facet, placing optical mask plate, there is angle α in mask striped and interference fringe, and interference fringe forms Moire fringe after mask plate modulation;
Step 3: adjust angle α and make D meet request detector;
When interference fringe moves to+directions X, Moire fringe will move to standard+Y-direction, and Moire fringe translational speed is directly proportional to moving interference fringes speed, the pass of Moire fringe width D and mask width of fringe L and angle α is D=L/ α again, therefore by adjusting the angle of optical mask plate, change angle α and make D meet request detector.
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| CN201210331210.XA CN103674006B (en) | 2012-09-07 | 2012-09-07 | The integrated Multiplexing apparatus of a kind of laser gyro and conjunction light method |
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| CN201210331210.XA CN103674006B (en) | 2012-09-07 | 2012-09-07 | The integrated Multiplexing apparatus of a kind of laser gyro and conjunction light method |
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| CN103674006B CN103674006B (en) | 2016-03-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110986910A (en) * | 2019-11-29 | 2020-04-10 | 江西驰宇光电科技发展有限公司 | Laser gyroscope light combining device for reducing stress effect |
| CN112749732A (en) * | 2020-12-15 | 2021-05-04 | 华南理工大学 | Multi-template included angle resolution calculation method for structured light welding seam positioning |
| CN114705175A (en) * | 2022-05-25 | 2022-07-05 | 湖南亿诺胜精密仪器有限公司 | Light combination and direct current frequency stabilization control integrated device of laser gyro readout optical system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110986910A (en) * | 2019-11-29 | 2020-04-10 | 江西驰宇光电科技发展有限公司 | Laser gyroscope light combining device for reducing stress effect |
| CN112749732A (en) * | 2020-12-15 | 2021-05-04 | 华南理工大学 | Multi-template included angle resolution calculation method for structured light welding seam positioning |
| CN112749732B (en) * | 2020-12-15 | 2023-08-22 | 华南理工大学 | Multi-template pinch angle resolution calculation method for structured light weld positioning |
| CN114705175A (en) * | 2022-05-25 | 2022-07-05 | 湖南亿诺胜精密仪器有限公司 | Light combination and direct current frequency stabilization control integrated device of laser gyro readout optical system |
| CN114705175B (en) * | 2022-05-25 | 2022-09-02 | 湖南亿诺胜精密仪器有限公司 | Light combination and direct current frequency stabilization control integrated device of laser gyro readout optical system |
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