CN106342182B - A kind of laser gyro based on longitudinal radio frequency discharge - Google Patents

Abstract

The invention belongs to laser gyroscope technology, and relates to a laser gyroscope based on longitudinal radio frequency discharge. The laser gyroscope based on longitudinal radio frequency discharge includes a cavity, a reflector, a charging and exhausting electrode, and an aperture electrode, wherein, interconnected annular capillary holes are arranged in the cavity, and the charging and discharging electrodes are metal tubes , is arranged on the cavity and communicates with the annular capillary hole, and the aperture electrode is arranged opposite to the charging and exhausting electrode, and the central axes of the two are consistent. In addition, a section of the aperture electrode communicates with the annular capillary hole, and the aperture The small radial through hole acts as a stop to ensure the normal operation of the laser gyro in the fundamental transverse mode. The laser gyro based on longitudinal radio frequency discharge of the present invention provides laser gain by using high voltage and low frequency radio frequency discharge, which has small volume, simple structure, high discharge efficiency, and small electromagnetic radiation, effectively realizing the miniaturization of the laser gyro.

Description

A Laser Gyro Based on Longitudinal Radio Frequency Discharge

technical field

The utility model belongs to the laser gyroscope technology and relates to a laser gyroscope based on longitudinal radio frequency discharge.

Background technique

Laser gyro is a kind of angular velocity sensor, which generally adopts a ring laser, and its gain method often adopts a high-voltage DC discharge method. Miniaturization is a development trend of optical gyroscopes. However, when the cavity length of laser gyroscopes becomes smaller, the conventional DC discharge method is difficult to meet the gain requirements, and DC discharge will cause output errors of laser gyroscopes. In addition, key components such as diaphragms and light combining devices commonly used in laser gyroscopes require high processing and installation tolerances and high costs, making it difficult to meet the application requirements of micro-miniature laser gyroscopes with cavity lengths within 40mm.

The existing laser gyroscope longitudinal radio frequency discharge all adopts the solenoid form (as shown in Figure 1), that is, the outer wall of the laser gyroscope cavity 8 discharge path is evenly wound with a good conductor to form a solenoid 7, and the two ends of the solenoid A lead end is connected to a radio frequency signal, driven by the radio frequency signal, an alternating magnetic field is formed inside the solenoid along the direction of the tube axis, and under the action of the magnetic alternating magnetic field, the gain gas in the discharge channel is ionized and discharged, thereby forming a smooth, Laser running counterclockwise.

The structure of the technical scheme is complicated, and the winding groove of the solenoid and the conductor with good performance must be added on the outer wall of the discharge channel. At the same time, due to the electromagnetic conversion problem, the discharge efficiency is low and the electromagnetic radiation is serious.

Utility model content

The purpose of the utility model is to provide a laser gyroscope based on longitudinal radio frequency discharge with small volume, simple structure, high discharge efficiency and low electromagnetic radiation.

The technical scheme of the utility model is: a laser gyroscope based on longitudinal radio-frequency discharge, which includes a cavity, a reflector, a charging and exhausting electrode, and a diaphragm electrode, wherein the cavity is provided with interconnected annular capillary holes, so The charging and exhausting electrode is a metal tube, which is arranged on the cavity and communicated with the annular capillary hole. It is a radial through hole with a diameter of 0.4mm to 1.4mm that communicates with the annular capillary and acts as a diaphragm.

The length of the radial through hole in the aperture electrode is 0.3mm-1mm.

The reflectors include two path length control mirrors, one common reflector and one integrated light-combining prism. The above four reflectors are arranged on the cavity, and the optical glue surfaces are all rectangular.

The upper end surface of the integrated light-combining prism has an oblique cut surface as a reflective surface.

The utility model has the advantages that: the laser gyroscope with longitudinal radio frequency discharge of the utility model adopts the form of vertical double-electrode high voltage and high frequency radio frequency discharge to realize laser output. A through hole with a small aperture in the aperture electrode is used as an aperture to limit the high-order transverse mode, so as to ensure the normal operation of the laser gyro in the fundamental transverse mode. Compared with the prior art, the utility model does not need to uniformly wind a solenoid with a good conductor on the outer wall of the discharge path of the laser gyroscope, and there is no electromagnetic conversion problem, and it is small in size, simple in structure, high in discharge efficiency, and electromagnetic The radiation is small, which effectively realizes the miniaturization of the laser gyroscope.

Description of drawings

Fig. 1 schematic diagram of existing longitudinal radio frequency discharge laser gyroscope;

Fig. 2 is the front view of the laser gyroscope based on longitudinal radio frequency discharge of the present invention;

Fig. 3 is the cross-sectional view of the laser gyroscope based on longitudinal radio frequency discharge of the present invention;

Among them, 1-charge and exhaust electrodes, 2-integrated combined light prism, 3-path length control mirror, 4-diaphragm electrode, 5-capillary hole, 6-thin light hole, 7-solenoid, 8-laser Gyro cavity.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

Please refer to FIG. 2 and FIG. 3 at the same time, wherein FIG. 2 is a front view of the laser gyro based on longitudinal radio frequency discharge of the present invention, and FIG. 3 is a cross-sectional view of the laser gyro based on longitudinal radio frequency discharge of the present invention. The laser gyro based on the longitudinal radio frequency discharge of the utility model comprises a cavity body, a reflector, a charging and exhausting electrode, and an aperture electrode. Among them, the reflector includes two path-length control mirrors, one ordinary reflector and one integrated light-combining prism. Body connection reliability. In addition, the upper end surface of the integrated light-combining prism has a chamfered surface, which is used as a reflection surface, so that the laser gyroscope can form interference fringes with clockwise and counterclockwise light. The charging and exhausting electrodes are arranged on the cavity between the ordinary reflector and the integrated light-combining prism, and communicate with the capillary inside the cavity. The diaphragm electrode is arranged opposite to the charging and exhausting electrode, and the central axes of the two are consistent. Between the charging and exhausting electrode and the aperture electrode is a radio frequency signal with a high voltage higher than 200V and a low frequency lower than 100MHz, which provides gain to the laser gyro through longitudinal radio frequency discharge. Compared with the existing longitudinal radio frequency discharge laser gyro, the utility model There is no need to uniformly wind a solenoid on the outer wall of the discharge path of the laser gyro with a good conductor, and there is no need to generate a magnetic field on the discharge channel to achieve longitudinal discharge, and there is no low electromagnetic conversion efficiency, low discharge efficiency, and serious electromagnetic radiation. The problem.

Please refer to FIG. 3 , which is a cross-sectional view of the laser gyroscope based on longitudinal radio frequency discharge of the present invention. The capillary holes inside the laser gyroscope are interconnected annular pipelines, wherein the diaphragm electrode has a thin aperture 6 with a smaller aperture. The diameter of the fine aperture is between 0.4mm and 1.4mm, and the length It can be used as an aperture between 0.3mm and 1mm to limit the high-order transverse mode to ensure the stable operation of the fundamental transverse mode of the laser gyroscope.

In this embodiment, the laser gyroscope based on longitudinal radio frequency discharge adopts vibration bias, is small in size, and has a cavity length of only 40 mm. It uses longitudinal radio frequency electrode high voltage and low frequency radio frequency discharge to provide laser gain, and the gain gas is He-He gas. The wavelength is 0.6328μm or 1.15um. In actual operation, a high voltage higher than 200V and a low frequency radio frequency lower than 100MHz are discharged between the charging and exhausting electrodes and the diaphragm electrode to form clockwise and counterclockwise light in the cavity. The aperture restricts the high-order transverse mode so that the fundamental transverse mode can work stably, and the optical path is controlled by a piezoelectric ceramic drive length control mirror to achieve frequency stability. The clockwise and counterclockwise light emitted from the cavity interferes after passing through the integrated light-combining prism. The moving speed of the interference fringes is detected by the photoelectric tube to obtain the beat frequency of the clockwise and counterclockwise light, and the angle measured by the gyroscope is obtained through the detection, control and signal processing circuits. rate.

Claims (4)

1. A laser gyroscope based on longitudinal radio-frequency discharge, characterized in that: it comprises a cavity, a reflector, an exhaust electrode (1), and an aperture electrode (4), wherein an interconnected annular capillary is set in the cavity. hole (5), the charging and exhausting electrode (1) is a metal tube, arranged on the cavity and communicated with the annular capillary hole (5), the diaphragm electrode (4) is arranged on the opposite side of the charging and exhausting electrode, and The central axes of the two are consistent. In addition, a radial through hole (6) with a diameter of 0.4 mm to 1.4 mm is provided in the middle of the diaphragm electrode to communicate with the annular capillary and serve as the diaphragm. 2. The laser gyro based on longitudinal radio-frequency discharge according to claim 1, characterized in that the length of the radial through hole in the aperture electrode is 0.3mm-1mm. 3. The laser gyro based on longitudinal radio-frequency discharge according to claim 2, characterized in that: the reflectors include two path length control mirrors, one common reflector and one integrated light-combining prism, and the above four reflectors The mirror is arranged on the cavity, and the optical glue surfaces are all rectangular. 4. The laser gyro based on longitudinal radio-frequency discharge according to claim 3, characterized in that: the upper end surface of the integrated light-combining prism has a chamfered surface as a reflective surface.