JPS58137276A - Ring laser-gyroscope - Google Patents

Abstract

PURPOSE:To manufacture the ring laser-gyroscope easily by drawing out laser beams through a Brewster window, reflecting the laser beams from a concave mirror and forming an annular photoelectric circuit. CONSTITUTION:Laser beams 9 are extracted to the outside by a small damping factor or returned into a glass block 1 from the outside by forming the Brewster windows 7, 8 to the glass block 1. Laser beams 9 drawn out of the glass block 1 are reflected by the concave mirror 4, and returned into the glass block 1. The concave mirror 4 is set up to a L-shaped support base 10, and a position to laser beams 9 is fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION Regarding the ring laser gyro according to the present invention, it is particularly an object of the present invention to propose a ring laser gyro that can be easily assembled.

[General explanation of Ring Laser Gyro] 92 laser beams generated by electric discharge are rotated in opposite directions clockwise and counterclockwise, and the angular velocity of the rotation axis groove is given. When the input angular velocity and the frequency of the laser beam in one direction are high, the frequency of the laser beam in the opposite direction is low, and the frequency difference changes depending on the magnitude of the angular velocity K. There is a ring laser jip that determines #j.

Conventionally proposed ring laser gyros are roughly divided into round internal mirror type, in which the mirror is directly fixed to the block body including the discharge tube part, and external mirror type, in which the mirror is indirectly fixed to the block body. Ru.

As mentioned above, the external mirror type ring laser gyro has a mirror fixed to the block body, and a shilling-shaped optical path is formed through this mirror.
The mirror fixing structure becomes complicated and it becomes difficult to downsize the device. In addition, in order to use it as a gyroscope, stability against disturbances such as vibration and temperature changes is required, so there are many practical difficulties. There are almost no practical examples of this rounding.

On the other hand, the internal mirroring laser gyro is composed of a glass block 1 as shown in FIG. A ring-shaped optical path is formed with the pores formed in the pores. In this manner, the structure of the internal ring laser gyro is simplified because the optical path and the mirrors 2, 3, 4 are integrated. Since the mutual positional relationship between the ti mirrors 2, 3.4 and the laser beam is maintained stably, the device operates stably even against disturbances such as temperature changes and amplitude.

Therefore, at present, only this internal mirror type laser beam is widely used.

<Disadvantages of the conventional internal mirror type ring laser gyro> The large pores formed in the glass block l are filled with, for example, helium neon gas to form the discharge tube section. The mirrors 2, 3, and 4Fi serve to rotate the laser beam emitted by the discharge tube section into a ring shape, and are also used as a sealing means for sealing the pores in the glass block 1. Therefore, the mirror 2.3.4 is bonded to the glass block 1 by contact or the like for vacuum sealing.

Here, the mirror 2 is composed of a half mirror and is called a read mirror. A plane mirror 3 is used, and a concave mirror 4 is used to slightly adjust the position of the laser beam passage. Adjustment is performed so that the Schilling laser gyro can stably function as a gyro and obtain sufficient output by moving the fourth concave mirror to the third position.

However, as mentioned above, the mirrors 2, 3, and 4 are also used as means for sealing the discharge tube, so the position of the concave mirror 4 is adjusted while maintaining the discharge state for emitting laser light. It is not possible. Therefore, in the past, the concave mirror 4 was placed on the glass block 1 and the output of the laser beam was measured in that state, and if the measured value was lower than the calculated value, the concave mirror 4 was removed again, the position was changed, and the adhesive was reattached. Then, in that state, the output of the laser beam in the housing is measured, and the adjustment is repeated until the output value reaches the desired value. Therefore, the adjustment work is time-consuming, and the product can be manufactured as scheduled. The drawbacks are that it is not possible to do so, and that the effort required for adjustment is costly. In addition, since there is a limit to the number of times the concave mirror 2-4 can be bonded and removed, if Ki1 is attached and removed more than once, the glass block 1 and the concave mirror 4 may become unusable, which is also costly. It has the disadvantage of being expensive.

OBJECTS OF THE INVENTION The present invention provides a ring laser gyro with a structure that can be easily manufactured.

<** of the invention> In this invention, a glass block IK brease/window is formed, laser light is guided from the glass block through this Brewster window, and the derived laser light is reflected by a concave mirror and then redirected to the Brewster window. A laser beam is introduced into the glass block through the window. In this manner, the discharge tube section is often structured so that the position of the concave mirror can be adjusted while maintaining the discharge.

<Structure of this Q invention> An embodiment of this invention will be described in detail below using FIG.
KI3! I will clarify.

FIG. 2 shows an embodiment of the present invention. In the figure, 1 is a glass block, 2tt reading mirror, 3 is a plane mirror, and 4 is a concave mirror. In this invention, a Brewster window 7 is provided on the two optical paths 5 and 6 with the concave mirror 4 as a reflection point.
and 8 are provided, and the laser beam 9 is guided out of the glass block l through the Brewster windows 7 and 8. Although the laser beam 9 is drawn as a single line in the figure, there are actually two laser beams in the clockwise direction #1 and the counterclockwise direction.

The Brewster windows 7 and 8 are sealed with flat glass (or a flat transparent body) and have a nine-structure structure, and the angle between the plate surface of the flat glass and the beam 9 is selected to have a specific relationship. This makes it possible to reduce the reflection loss on the glass surface to a point where it can be ignored. This principle is derived from Pleastar's law and is conventionally known.

In this way, the pre-aster windows 7 and 8 are attached to the glass block 1.
By providing the laser beam 9, the laser beam 9 can be extracted to the outside with a small attenuation rate, and can also be returned into the glass block 1 from the outside.

A laser beam 9 derived from the glass block l is reflected by a concave mirror 4 and returned into the glass block 1. Therefore, the concave mirror 4 can maintain the discharge for emitting the laser beam 9 within the glass block 1 and adjust its position in good condition. concave me)-4
is finally attached to the illustrated L-shaped support base 10, and its position relative to the laser beam 9 is fixed. When finding the optimum position for the concave mirror 4, support the support base 10 and the glass block IFi on a jig (411FK not shown) so that they can move slightly in the X and Y directions.
The relative position of the support stand 10 and the glass block 1 is adjusted using this jig. The concave mirror 4 is supported on a jig that can be moved slightly in two directions along the vertical plane of the expanded support stand lO.

In this way, the position of the concave mirror 4 is determined in advance to the optimum position using a jig, and with the position determined, the glass block l and the support stand 10 are placed l! I'M agent w1. is fixed by other means, and then the concave mirror 4 is fixed to the support base 10.

<Effects of the Invention> As explained above, according to the present invention, the glass block 1 constituting the discharge tube section of the laser jig 4 has the readout mini 5-2.
, the flat mirror 3 and the blue windows 7 and 8, it is possible to cause a discharge to emit a laser beam within the glass block l. Then, the position of the concave surface 4 can be adjusted while maintaining the discharge. Therefore, it is possible to easily find the optimal position of the concave mirror 4 at the right time. However, if the support base 10 is made of a material with an extremely small coefficient of thermal expansion, stable operation can be achieved even with temperature fluctuations. By increasing the strength of the support base 10, stable operation can be achieved even against vibrations. It is assumed that the concave mirror 4 and the glass block 1#'i are housed in a single container and made of K11 so as not to be affected by dirt, dust, etc.

As mentioned above, this invention will help you as well as others.
It is possible to provide a ring laser gyroscope which is easy to manufacture and capable of mass production, and its industrial effects are enormous.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the machine part of a conventional ring laser machine, and FIG. 2 is a perspective view showing a part of a ring laser machine according to the present invention. 1 glass block, 2: exit mirror, 3: plane mirror, 4: concave mirror, 5, 6: optical path, 7.8: Brewster window, 9: laser beam lO: support stand. Patent Applicant Japan Aviation Electronics Industry Co., Ltd. Agent Takashi Single Needle, l＼

Claims (1)

[Claims] (1) A cloud-shaped optical path is formed in the glass square using a round hole and a plurality of filters, and a pre-aster window is formed in the two optical paths with the reflection point of one mirror as the apex.
A ring laser gyro in which a laser beam is guided out of the glass block through the pre-acitor window, and the laser beam is reflected by a concave mirror to form a dark optical path.