CN102012227A - Inclined contact type cavity-adjusting mechanism and method of laser gyro - Google Patents

Abstract

The invention relates to an inclined contact laser gyroscope cavity adjustment mechanism and method. The cavity adjustment mechanism is composed of a three-dimensional precision workbench and clamping claws in series. The whole mechanism is installed obliquely to obtain the tilt angle and degree of freedom required by the inclined contact cavity adjustment method; the clamping claws adopt a V-shaped structure, which can realize The positioning of the spherical mirror, and the optical glue can be completed after the cavity adjustment is completed. The tilt-contact laser gyro cavity adjustment method utilizes the force between the spherical mirror and the laser resonant cavity to achieve reliable bonding of the two optical adhesive surfaces, ensuring the parallelism between the optical adhesive surfaces and avoiding accidental light in the traditional cavity adjustment method. Glue case. The invention adopts the inclined contact method to establish a set of precise chamber adjustment mechanism, which has the advantages of simple structure, high motion resolution, easy control and good operability.

Description

Mechanism and method for adjusting cavity of tilted contact laser gyroscope

technical field

The invention relates to a cavity adjustment mechanism and method of a laser gyroscope.

technical background

Laser gyroscope is an ideal device for strapdown inertial navigation system, especially in the military field, laser gyroscope occupies a pivotal position. Cavity tuning is a difficult point in the manufacturing process of laser gyroscopes. my country's laser gyro cavity adjustment assembly technology is relatively backward, and manual methods have been mainly used for a long time. Manual tuning requires high operator experience and skills, high labor intensity, and low efficiency. Due to uncertain factors such as experience and emotions, the quality of tuning is unstable, which seriously restricts the increase in product output and QC. The cavity length control mirror cavity tuning method can only be tuned in a small range. When the laser beam in the loop deviates greatly from the loop center, the cavity tuning effect of the cavity length control mirror will fail. In addition, the driver used in this method —The sensitivity of piezoelectric ceramics is related to temperature. When the ambient temperature changes, its expansion and contraction will change, making the resonant optical path deviate from the optimal point. The horizontal non-contact cavity adjustment method that has appeared in recent years can adjust the cavity in a wide range, but because it is difficult to detect the parallelism between the spherical mirror and the optical rubber surface of the resonant cavity during the cavity adjustment process, it is difficult to achieve high parallelism requirements , so that the tuning efficiency and tuning quality of this method are difficult to achieve the desired effect.

Contents of the invention

The purpose of the present invention is to provide a tilting contact laser gyroscope cavity adjustment mechanism and method, which is simple, convenient and has good operability.

To achieve the above object, design of the present invention is:

The existing horizontal non-contact tuning method is difficult to meet the requirements of parallelism, and the structure is complex and difficult to control. The invention adopts the inclined contact cavity adjustment method, relies on the gravity of the spherical mirror to solve the high parallelism requirement of the cavity adjustment, reduces the two-dimensional rotation mechanism used for parallelism adjustment in the horizontal non-contact cavity adjustment method, and only needs a three-dimensional translation mechanism. It meets the needs of tuning, and has a simple structure and is easy to control.

According to above-mentioned inventive concept, the present invention adopts following technical scheme:

An inclined contact laser gyro cavity adjustment mechanism includes an inclined contact laser gyro cavity adjustment mechanism, including an optical platform, a cavity support, and a resonant cavity and a spherical mirror to be adjusted, characterized in that:

1) The cavity support is fixed on the optical platform, and the angle between the upper surface of the cavity support and the horizontal plane is α , 8.5 o ≤ α ≤ 90 o; the cavity to be adjusted is placed on the upper surface of the cavity support the resonant cavity;

2) On the optical platform, two sets of three-dimensional precision worktables with clamping claws are installed through a connecting plate, which are respectively used to complete the adjustment of the spherical mirror at the two stations.

The two sets of three-dimensional precision workbenches, each set of workbenches in the two sets of three-dimensional precision workbenches are fixed in series on an inclined base by a vertical workbench, a horizontal workbench and a normal workbench in an orthogonal manner, The inclined base is fixed on the optical table through the connecting plate.

The structure of the clamping claw is: there are two screw holes on the lower end connector of a claw rod, which is fixedly connected with the vertical workbench through screws, and the upper end of the claw rod has a V-shaped structure, which can hold the spherical mirror Fork holding realizes the horizontal and vertical positioning of the spherical mirror on the optical plastic surface of the resonant cavity, but has no positioning function in the normal direction of the optical plastic surface.

A cavity adjustment method for an inclined contact laser gyro, which uses the above-mentioned mechanism to adjust the cavity, and is characterized in that the operation steps are as follows: a) reset the three-dimensional workbench; b) place a spherical mirror on the clamping claw, so that the spherical mirror is tightly closed under the action of gravity Fit on the optical plastic surface of the resonant cavity; c) Control the vertical worktable and horizontal worktable to drive the clamping claws to move laterally and vertically along the optical plastic surface of the resonant cavity until the best position of the spherical mirror is found. Good points; d) The normal worktable drives the clamping claws to move slightly towards the direction close to the resonant cavity to realize the optical glue between the spherical mirror and the resonant cavity; e) The three-dimensional worktable returns to the end position to complete the assembly of a spherical mirror in one station . The assembly steps of the spherical mirror at another station are the same as the steps a) to e) listed above.

Compared with the prior art, the present invention has the following obvious substantive features and advantages: the present invention adopts an inclined contact cavity adjustment mechanism and method, has simple structure, high motion resolution, easy control and good operability.

Description of drawings

Fig. 1 is the optical device schematic diagram to be assembled of the present invention;

Fig. 2 is a schematic diagram of the contact effect between the spherical mirror and the resonant cavity when the cavity is adjusted by the method of the present invention;

Fig. 3 is the overall structural representation of an example of the present invention;

Fig. 4 is the left view of Fig. 3;

Fig. 5 is a schematic diagram of the structure of the clamping claw of the present invention.

Detailed ways

Preferred embodiments of the present invention are described as follows in conjunction with the accompanying drawings;

Embodiment 1: Referring to Fig. 1, Fig. 2 and Fig. 3, the tilting contact laser gyro cavity adjustment mechanism includes an optical platform 10, a cavity support 4, and a resonant cavity body 1 and a spherical mirror 2 to be tuned. Features:

1) The cavity support 4 is fixed on the optical table 10, and the angle between the upper surface of the cavity support 4 and the horizontal plane is α , 8.5o≤α≤90o ; the upper surface of the cavity support 4 Place the resonant cavity 1 to be tuned;

2) On the optical table 10, two sets of three-dimensional precision workbenches with clamping claws 3 are installed through a connecting plate 9, which are respectively used to complete the adjustment of the spherical mirror 2 at the two stations.

Embodiment 2: This embodiment is basically the same as Embodiment 1. The special feature is that each set of workbenches in the two sets of three-dimensional precision workbenches is composed of a vertical workbench 5, a horizontal workbench 6 and a normal workbench. The stage 7 is fixed in series on an inclined base 8 in an orthogonal manner, and the inclined base 8 is fixed on the optical platform 10 through the connecting plate 9 . The structure of the clamping claw 3 is: there are two screw holes on the lower end connector of a claw rod, which are fixedly connected with the vertical workbench 5 by screws, and the upper end of the claw rod is a V-shaped structure, which can The spherical mirror 2 is held fork to realize the horizontal and vertical positioning of the spherical mirror 2 on the optical rubber surface of the resonant cavity 1, but has no positioning function in the normal direction of the optical rubber surface.

Embodiment 3: In this tilted contact laser gyroscope cavity adjustment method, the above cavity adjustment mechanism is used to adjust the cavity, and the operation steps are as follows: the assembly steps of a station spherical mirror 2 are: a) the three-dimensional workbench 5, 6, 7 is reset; b ) Place the spherical mirror 2 on the clamping claw 3, so that the spherical mirror 2 is closely attached to the optical rubber surface of the resonant cavity 1 under the action of gravity; c) Control the workbench 5, 6 to drive the clamping claw 3 along the resonant The lateral and vertical micro-movement of the optical plastic surface of the cavity 1 until the best point of the position of the spherical mirror 2 is found; d) The normal worktable 7 drives the clamping claw 3 to move slightly in the direction close to the resonant cavity 1 to realize the spherical mirror 2 The optical glue with the resonant cavity 1; e) The three-dimensional workbench 5, 6, 7 returns to the end position, and the assembly of the spherical mirror 2 at one station is completed. The assembly steps of the other station spherical mirror 2 are the same as the steps a) to e) listed above.

Embodiment 4: Referring to FIG. 1 and FIG. 3 , in this embodiment, spherical mirrors 2 are successively assembled on the two optical plastic surfaces of the optical resonant cavity 1 , and the two optical plastic surfaces are respectively defined as station 1 and station 2. The tuning method and mechanism are comprehensively described as follows:

Referring to Fig. 2 and Fig. 3, the above-mentioned oblique contact cavity adjustment method is to keep the optical glue surface of the resonant cavity 1 to be assembled and the direction of gravity at an inclined angle β , that is, the resonant cavity 1 is placed at an angle α to the horizontal plane. This inclination angle β should ensure that the spherical mirror 2 is always in close contact with the cavity 1 during the translation process of the three degrees of freedom without rollover. This angle range is 6 o ≤ β ≤ 45 o, and the corresponding α angle range is 8.5 o ≤ α ≤ 90 o.

Referring to Fig. 3 and Fig. 4, the chamber adjustment mechanism is composed of two sets of three-dimensional precision worktables with clamping claws, which are respectively used to complete the adjustment of the spherical mirror 2 at the two stations. The cavity adjustment mechanism includes two clamping claws 3, a cavity support 4, two vertical workbenches 5, two horizontal workbenches 6, two normal workbenches 7, two inclined bases 8, a Connecting plate 9 and an optical platform 10 . The clamping claw 3 is connected to the end of the vertical workbench 5; the cavity support 4 is fixed on the optical platform 10, and the angle between the upper surface and the horizontal plane is α (8.5 o ≤ α ≤ 90 o), on which The resonant cavity 1 is installed; the workbenches 5, 6, and 7 are fixed in series on the inclined base 8 in an orthogonal manner; the inclined base 8 is fixed on the optical platform 10 through the connecting plate 9, and, to ensure that the clip The end of the holding claw 3 is parallel to the optical plastic surface of the resonant cavity, and the installation surface of the inclined base 8 needs to have an inclination angle θ with the horizontal plane, and the angle range is 8.5 o ≤ θ ≤ 45 o. The three-dimensional precision workbench is composed of three one-dimensional translation workbenches with similar functions in series. It is driven by a pre-loaded precision ball screw, guided by a precision cross needle guide rail, driven by a stepper motor, and controlled by the stepper motor driver. The number of subdivisions, the workbench can realize rapid movement in a large range at a speed of 10mm/s, and can also realize precise adjustment in a small range, and its motion resolution can reach 1μm.

Referring to Fig. 5, the above-mentioned clamping claw 3 is integrated with the connecting rod, fixed on the vertical workbench 5, and is in line contact with the spherical mirror 2, and adopts duralumin material to ensure light weight and high hardness. The clamping claw 3 drives the spherical mirror 2 to achieve translation in three directions. The head of the claw is composed of V-shaped and arc-shaped two parts. The V-shaped angle is 60°. During the movement, the spherical mirror 2 is always adsorbed on the resonant cavity On the optical glue surface of the body 1, the movement of the claw 3 will not change the bonding state of the spherical mirror 2 and the resonant cavity 1 . The height of the arc portion of the gripper 3 exceeds the center of the spherical mirror 2. After the cavity adjustment is completed, the gripper 3 moves toward the resonant cavity 1 under the drive of the worktable 7, and the light is realized by using the pressure between the spherical mirror 2 and the resonant cavity 1. glue.

Claims (4)

1. an inclination contact laser gyro is transferred chamber mechanism, and the resonant cavity (1) and the spherical mirror (2) that comprise an optical table (10), a cavity bearing (4) and wait to transfer the chamber is characterized in that:

A. described cavity bearing (4) is fixed on the described optical table (10), and the upper surface and the horizontal plane angle of this cavity bearing (4) are α, 8.5 o≤ α≤ 90 o; Settle on cavity bearing (4) upper surface and wait to transfer the resonant cavity (1) in chamber;

B. on described optical table (10), the three-dimensional precision stage that two covers have retaining paw (3) is installed, is respectively applied for the adjustment of finishing two described spherical mirrors of station (2) by a web joint (9).

2. inclination contact laser gyro according to claim 1 is transferred chamber mechanism, it is characterized in that every cover worktable is to be fixed on the inclined base (8) by the orthogonal manner series connection by a vertical worktable (5), a horizontal table (6) and a normal direction worktable (7) in the three-dimensional precision stage of described two covers, this inclined base (8) is fixed on the described optical table (10) by described web joint (9).

3. inclination contact laser gyro according to claim 1 is transferred chamber mechanism, the structure that it is characterized in that described retaining paw (3) is: two screws are arranged on the lower end connector of a claw bar, fixedly connected with described vertical worktable (5) by screw, and the V-shaped structure in the upper end of claw bar, can hold spherical mirror (2) fork, realize spherical mirror (2) in horizontal and vertical location, resonant cavity (1) optical cement face upper edge, but do not have positioning action in optical cement face normal direction.

4. an inclination contact laser gyro cavity adjustment method adopts inclination contact laser gyro according to claim 1 to transfer chamber mechanism to transfer the chamber, it is characterized in that operation steps is as follows:

A. the installation step of a station spherical mirror (2) is:

A. three-dimensional working platform (5,6,7) resets;

B. on retaining paw (3), lay spherical mirror (2), spherical mirror (2) is fitted tightly under action of gravity on the optical cement face of resonant cavity (1);

C. Control work platform (5,6) drives the horizontal and vertical micromotion of retaining paw (3) along resonant cavity (1) optical cement face, until the optimum that searches out spherical mirror (2) position;

D. normal direction worktable (7) drives retaining paw (3) near resonant cavity (1) direction micromotion, realizes the optical cement of spherical mirror (2) and resonant cavity (1);

E. three-dimensional working platform (5,6,7) turns back to terminal position, finishes the assembling of a station spherical mirror (2);

B. the installation step of another station spherical mirror (2) with the step a among the step A to step e.

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