SU1714348A1 - Device for control of angle of beam deflection and of pyramidality of prisms ap-@@@ - Google Patents

Abstract

The invention relates to optical instrument making, namely, optical measurements, and is intended to control the angle of deflection of the beam and the pyramid of prisms AP-0 °. The aim of the invention is to improve the accuracy of control and automation of the process. A device for controlling the angle of deflection of the beam and the pyramid of prisms AR.-0 °. consists of a light source 1, a condenser 2. a collimator including a lens 3 and a slit diaphragm 4. installed in its front focal plane, an opaque screen 5 with a diaphragm, a controlled prism 6. a lens 7. two position-sensitive photodetectors 8 and 9. a processing unit information 10. display unit 11 and block tsifrotecha-ti 12. 2 ill.

Description

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 Sl) Ji. 00 Figure 1

The invention relates to the field of optical instrumentation, and more specifically to the field of optical measurements, and is intended to control the beam deflection angle and the pyramid of the AR-O prisms.

Devices are known for controlling the deflection angle of the beam and the pyramid of the AP-O prisms. using these devices, it makes (; measuring the angles of deflection of the beam and pyramidality by a visual method using a collimator and a telescope on a goniometer.

It is also known a device that is a visual autocollimator mounted in front of the hypotenuse edge of a controlled prism in such a way that its axis is perpendicular to the hypotenuse edge. There are five highlights in the field of view. In the absence of a pyramidal controlled prism, all the highlights are located on the same straight line, and in the absence of an error in the angle of the prism, all the highlights are combined into one.

The disadvantages of the known device are insufficient measurement accuracy (+1,2), low productivity, inability to automate the measurement process.

The purpose of the invention is to improve the accuracy of control and automation of the process.

Fig. 1 is a schematic diagram of the device; Fig. 2 shows the layout of the slits of the collimator and photodetectors.

The device for controlling the deflection angle of the beam and the pyramid of prisms AP-0 ° (Fig. 1) consists of a light source 1, a condenser 2, a collimator consisting of objective 3 and a slit diaphragm 4 installed in its front focal plane, an opaque screen 5 a diaphragm, a controlled prism 6, a lens 7, two position-sensitive photo transmitters 8 and 9, an information processing unit 10, a display unit 11 and a digital printing unit 12.

A device for controlling the deflection angle of the beam and the pyramid of prisms AP-O works as follows.

The collimator lens 3 forms a wide beam of parallel rays from each slit diaphragm. The opaque screen 5 limits the beams to a size which is obviously smaller than the entrance face of the controlled prism 6. Thus, the beams of rays that have left the collimator lens must pass only through the controlled prism. The beams of rays that pass through the controlled prism enter the lens 7,

which builds in its rear focal plane an image of the slits 4. In the absence of a controlled prism 6, the image of the slits 4 is located relative to the photodetectors in such a way that the signals taken from them are zero. When a controlled prism is installed in the course and there is no error in the angle and pyramidality of the image, the slit image is shifted from its original position and the photodetectors produce signals proportional to the amount of slit image displacement. The signals from the photodetectors come in two separate

input unit 10 processing information.

The photodetector 8 is installed in such a way that it responds to the deflection of a beam of rays that have passed through a controlled prism, i.e. to offset the corresponding

slit parallel to itself. The offset of this gap due to the error in the corners of the controlled prism does not cause a change in the signal from the photodetector 8. Thus, the photodetector 8 generates a signal.

proportional only to the pyramid of the controlled prism 6.

The photodetector 9 is installed perpendicular to the photodetector 8 and an image of the corresponding

slots. The working shift of the slit image parallel to oneself will occur only when the beams of rays that have passed through the controlled prism are deflected due to errors in its corners.

In the information processing unit 10, the data on the focal distance of the lens 7 and the positional sensitivity of the photodetectors 8 and 9 are laid. Then in the information processing unit 10 after receiving

signals from photodetectors are determined by the angles of deflection of parallel beams of rays due to the pyramidality and the error in the angles of the controlled prism using the formula

 arctg

uk

 is

rrp

where and - the magnitude of the signals from the photodetectors; K - positional sensitivity of each photodetector; f - focal

TO

lens distance 7, C is a coefficient characterizing each specific device.

The angles a calculated in the information processing unit 10 can be fixed on separate digital boards of the display unit 11 or on the tape of the digital printing unit

12, which are associated with the outputs of the information processing unit.

Claims (1)

The formula of the device for controlling the angle of deflection of the beam and the pyramid of prisms AR-0 °. including successively located detector, condenser, collimator, and recorder. distinguished by the fact that, in order to improve the accuracy of control and automation of the process, the recorder is made in the form of a sequentially installed lens and front receiving unit, One of the outputs of the processing unit is connected to the input of the display unit, the other output is connected to the input of the information unit, and the two output oriented mutually perpendicular position-sensitive photo detectors and information processing unit, whose input is associated with the outputs of the photodetectors, information unit and digital printing unit. The collimator is made in the form of a serially located lens and a slit diaphragm installed in its focal plane.