RU2321874C1 - Device for automatical adjustment of optical system - Google Patents

Abstract

FIELD: optical engineering.

SUBSTANCE: device for automatic adjustment has input and output channels for letting light beam go; both channels are placed in walls of device. Axes of channels are parallel to Y axis and are shifted one relatively other along axes X and Z. Device also has four mirrors. Two mirrors are mounted in opposition to input and output channels correspondingly and they are tightly connected with walls; two other mirrors are tightly attached to armpiece composed of two parts connected by clutch, which clutch provides mutual motion of parts of armpiece; parts of armpiece stay coaxial. Mentioned walls are capable of mutual shifting along axes of X, Y and Z. Optical axis of device goes through centers of mirrors at angle of 45° to plane of mirror. Ends of armpiece are attached to movable supports. One of supports is mounted for free shift along X axis along guide attached to wall at side of one of channels of optical system. Other support is mounted for movement along Z axis along guide attached to wall at other side of channel. Device is capable of working in vacuum at high level of ionizing radiations; device doesn't require power supplies and it provides adjustment of optical system in three directions.

EFFECT: improved reliability of operation; higher efficiency.

4 cl, 2 dwg

Description

The invention relates to devices designed for automatic alignment of optical systems under vibration conditions. Since the device lacks electronic elements sensitive to ionizing radiation, it can be used as an element of measuring equipment in installations where a high level of radioactivity is present.

A device for image stabilization is known (RF patents Nos. 2091843, G02B 27/64), intended for image stabilization in an optical device by compensating for image displacement. The device contains a fixed and movable mirror, as well as two-stage gyroscopes. The movable mirror is mounted with the possibility of simultaneous rotation around a horizontal axis lying in the plane of the mirror and a vertical axis located perpendicular to the horizontal axis and the optical axis of the device. On the axes of rotation of the frames of two-stage gyroscopes, respectively, angle sensors, torque sensors, operating units, executive motors with integrated feedback sensors are placed.

The principle of operation of the device is such a rotation of the movable mirror so that the image of the observed stationary object in the frame frame, for example, a movie camera, remains stationary relative to this frame.

The disadvantages of the device are:

- the use of a large number of electronic components, which increases the cost of the device, reduces its reliability and makes it impossible to use it in conditions of a high level of ionizing radiation;

- the need for the use of power sources.

A known image stabilization system (US patent No. 6064827, publ. 16.05.2000), called Shift-IS (Image Stabilizer) and used in digital cameras. The system consists of an input lens group, a biconcave lens, an output lens group, and a detector installed along the optical axis of the device. The principle of operation of the prototype is as follows. In the absence of camera displacement, the center of the image is located on the axis of the optical system and falls into the center of the photosensitive surface of the detector. When the lens oscillates, the center of the image shifts from the center of the photosensitive surface of the detector. When the camera tilts in a horizontal plane counterclockwise, the center of the image also shifts in that plane clockwise. In order to avoid this, the system uses stepper motors to offset the center of the biconcave lens in the same plane so that the refraction of light rays returns the center of the image to its original position. Since the oscillation of the image can also occur in the vertical plane, the biconcave lens can be shifted in this direction relative to its original (static) position in order to compensate for the deviation of the image.

Camera movements are detected by two gyroscopic sensors. The sensors determine the direction (angle) and speed of movement (jitter) of the camera with the lens and send this information to the high-speed 32-bit microprocessor. The microprocessor then converts the received signals from the two sensors into motion signals for the biconcave lens. Then the biconcave lens is set in motion and restores image stability.

The device allows you to effectively compensate for vibrations with a frequency of 0.5 to 20 Hz. The position of the stabilization unit is determined using infrared LEDs (IREDs - Infrared Emitting Diodes) on the frame of the unit and the position sensing device (PSD - Position sensing Device) located on the electronics board of the unit. Thus, initially the stabilization device has feedback for accurate positioning. The stabilization device also has a lock, which sets the biconcave lens in a central neutral position, when the image stabilization device is turned off.

The prototype has the following disadvantages:

- the use of lens optics, which does not allow the device to be used in conditions of a high level of ionizing radiation;

- the use of a large number of electronic components, which increases the cost of the device, reduces its reliability and makes it impossible to use it in conditions of a high level of ionizing radiation;

- the need for the use of power sources;

- low device performance.

The technical result, which the invention is directed to, is to create a device that could operate in a vacuum, with a high level of ionizing radiation, requiring no power sources, having higher speed and providing alignment in three directions - XYZ.

To achieve this result, a device is proposed for automatic alignment of the optical system in the XYZ direction, consisting of output and input channels for the passage of a light beam located in the walls of the device, while it additionally contains four mirrors, two of which are installed opposite the input and output channels, respectively, and rigidly connected to the walls, two other mirrors are rigidly fixed to the bracket, consisting of two parts connected by a coupling, providing the possibility of their movement along the axis Y, while the optical axis of the device passes through the center of the mirrors at an angle of 45 ° to the plane of the mirror, the ends of the bracket are mounted on movable supports, one of which is mounted to move along the X axis along a guide fixed to the wall from one of the channels of the optical system, and the other support is mounted to move along the Z axis along a guide fixed to the wall from the side of another channel, while the optical axis of the device passes through the center of the mirrors.

Mirrors can be made dielectric.

Mirrors can be made of metal.

Mirrors can be mounted on the bracket at an angle of 45 ° on both sides of the coupling.

Figure 1 shows a schematic diagram of a device. Figure 2 shows the placement of the device in an experimental thermonuclear reactor.

The positions indicated in the figures:

1 - input channel;

2, 3, 4, 5 - mirrors;

6 - output channel;

7, 8 - guides;

9 - an arm;

10, 11 - movable supports;

12 - coupling;

13 - a light beam;

14 - wall in which the inlet channel is located;

15 - wall in which the outlet channel is located;

16 - axis of the light beam;

17 - input diagnostic channel;

18 - cryostat flange;

19 - output diagnostic channel;

20 - cryostat housing;

21 is a diagnostic module.

The principle of operation of the proposed device is as follows. Consider an embodiment of the device shown in figure 1.

In the initial state, when there is no mutual displacement of the walls of the device 14 and 15, a circular beam of light with a small divergence is directed using mirrors 2, 3, 4 and 5 along the inlet and outlet cylindrical channels 1 and 6 located in the walls 14 and 15 so that its axis coincides with the axes of the channels and intersects the round mirrors 2, 3, 4 and 5 at their centers at an angle of 45 ° to the plane of the mirror. The axes of the channels are parallel to the Y axis and offset from each other along the X and Z axes. On the walls 14 and 15 there are guides 7 and 8 so that the guide 7 is parallel to the X axis and the guide 8 is parallel to the Z axis. Bracket 9 is installed in the guides 7 and 8 rigidly connected to the movable supports 10 and 11. The movable supports 10 and 11 have only one degree of freedom. The support 10 can move along the X axis along the guide 7, and the support 11 along the Z axis along the guide 8, while the bracket 9 always remains parallel to the Y axis. The bracket 9 consists of two parts connected by a sleeve 12. The coupling 12 provides only one degree freedom: perhaps only such a mutual movement of the parts of the bracket 9, in which the latter remain coaxial. Mirrors 2 and 5 are rigidly connected to the walls 14 and 15, and mirrors 3 and 4 are mounted on the bracket 9 on opposite sides of the coupling so that the angle between the plane of the mirrors 3, 4 and bracket 9 is 45 °. Suppose that the walls 14 and 15 are mutually displaced in the direction along the X axis. Then the movable support 10 has moved along the guide 7, the distance between the mirrors 2 and 3 has changed, but the beam axis still passes through the centers of the mirrors and coincides with the axes channels 1 and 6. If the mutual displacement of the walls 14 and 15 occurs along the Z axis, the movable support 11 moves along the guide 8, the distance between the mirrors 4 and 5 changes, but the axis of the beam still coincides with the axes of the channels. And, finally, when the walls 14 and 15 are displaced along the Y axis, the coupling 9 allows the mirrors 3 and 4 to move along the Y axis, the beam alignment is also preserved. Depending on the required optical and mechanical properties, mirrors 2, 3, 4, 5 can be metal and dielectric.

The described device is proposed to be used in the ITER experimental fusion reactor under construction.

For some optical diagnostics, the use of which is planned for ITER, it is necessary to conduct a light beam with a small divergence through the diagnostic channels 17 and 19 (see figure 2). The diameter of the diagnostic channel may exceed the beam cross section by no more than 1-2 cm, since an increase in the diameter of the channel leads to a decrease in the effectiveness of radiation protection. At the same time, during the operation of the reactor, a relative displacement of the cryostat body 20 and the input diagnostic channel 17 that is rigidly connected with it relative to the flange of the cryostat 18 and the output diagnostic channel 19 fixed on it is possible. high levels of neutron and gamma radiation. The reliability of the equipment used should be maximum, since access to the inside of the cryostat for equipment repair is not possible. In this case, the input mirror 2 of the device is rigidly mounted on the cryostat housing, and the output 5 is on the flange of the cryostat.

Thus, the proposed device, because does not contain electronic components, will allow alignment under vacuum and ionizing radiation, which will expand its functionality and be used in installations, for example, in thermonuclear reactors, etc.

Claims (4)

1. Device for automatic alignment, containing the output and input channels for the passage of the light beam located in the walls of the device, while the axis of the channels are parallel to the Y axis and offset relative to each other along the X and Z axes, and four mirrors, two of which are installed opposite the input and output channels, respectively, and are rigidly connected to the walls, two other mirrors are rigidly fixed to the bracket, consisting of two parts connected by a coupling, providing mutual movement of the bracket parts, in which the latter remain axial, while these walls have the possibility of mutual displacement along the axes X, Y, Z, the optical axis of the device passes through the center of the mirrors at an angle of 45 ° to the plane of the mirror, the ends of the bracket are mounted on movable supports, one of which is mounted with the ability to move along the X axis along a guide fixed to the wall from one of the channels of the optical system, and the other support is mounted to move along the Z axis along the guide fixed to the wall from the side of the other channel. 2. The device according to claim 1, characterized in that the mirrors are dielectric. 3. The device according to claim 1, characterized in that the mirrors are made of metal. 4. The device according to claim 1, characterized in that the mirrors are mounted on the bracket at an angle of 45 ° on opposite sides of the coupling.

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