SU396550A1 - PHOTOELECTRIC DEVICE FOR MEASUREMENT OF OBJECTS ABSOLUTION - Google Patents

Description

one

The invention relates to the field of measurement technology and to find applications where it is necessary to set the axes of various objects in such a way that they lie on one straight line, if only one continuation of the other. Such a task arises, during the reconciliation of the main shaft of ships, to check the alignment of the front and rear 6ai6oK holes of various large-sized machine tools used in sudostroy 1NII and Mashinostroenia, fixing directions in geodesy, etc.

A known photoelectric transducer | p1Itic device for measuring the misalignment of objects containing a nojector and receiving system. A searchlight consists of a radiation source and two (one-coordinate) equipment or three (two-component devices) optical systems that project the image of the source into the plane of the rib of the separative prism. The output of the projector from the searchlight is on its axis a pronounced equisignal zone. The receiver system includes a lens, photo detectors, and a control system.

However, the equal-signal zone of the beam 1 is projected by the projector lens for a well-defined distance, as a result of which the range of the known device is limited to a certain range, and the sensitivity inside the IKOTOroto is different. Because of mutual

The effect of the two (three) frequencies in the Electrometer decreases the sensitivity of the instrument. In addition, the presence of a two-channel (three-channel) optical system for a searchlight requires a fairly complex adjustment and can cause a systematic displacement of the beam axis due to differences in transmittance in the channels of the optical system.

The aim of the invention is to improve the accuracy of the device, as well as simplify its design.

This is achieved by the fact that the device is equipped with a beam-splitting unit that divides the light flux into two channels — the main and the reference; the projector is designed as a collimator; and B, the receiving system includes a linear raster moving progressively relative to the images of the collimator diaphragm in the main and reference channels, and an electronic circuit for testing sigpal from photodetectors, which generates a signal proportional to the phase difference of the signals in

both channels.

The drawing shows a schematic diagram of the proposed device.

The stream from the collimator / is focused by the objective 2 lens CHCTeMiii into the plane of the apalizatop - a raster image with alternating transparent and opaque lines of the same straight lines, the width of which is equal to the width of the diaphragm image of the collimator moved, for example, progressively by means of a high precision gear. 4. A beam-splitting unit is installed in the beam path from lens 2, for example a translucent beam-splitting plate 5, dividing the luminous flux coming from the receiver’s lens to Channel Islands - the main and reference.

Radiant fluxes in both channels using condensers 6 fall on the sensitive areas of the photodetectors 7 of the radiation. The signals amplified by amplifiers 8 in the circuits of both receivers are fed to an electronic system 9 for processing a signal from photo detectors (for example, a phase detector), which generates a signal proportional to the phase difference of the signals in both channels.

If the energy axis of the searchlight coincides with the optical axis of objective 2, then the phases of the electrical signals in both channels are equal and, therefore, the electronic system produces a zero signal. If the energy axis of the searchlight is shifted parallel to the optical axis of objective 2, the phase of the signal in the main channel changes by Df, and the phase of the signal in the reference -chain - by Df.

Therefore, the electronic system generates a signal, the following: transduced double phase phase shift 2Дф, i.e

out

where K is a certain (coefficient of impassability of the land, depending on the parameters of the specific instrument scheme.

iB: as a raster in the proposed device, it is POSSIBLE to use an oscillating tlastin (With the same transparent and opaque drawn lines on one of the same lines.

Subject and z o (b ete n i

A photoelectric device for measuring the misalignment of objects containing a searchlight and a receiving system including a lens and photo receivers, characterized in that, with a slit to increase the accuracy and simplify the design of the instrument, it is equipped with a construction block that divides the light flux from the receiver of the Receiver by , va 1ka.nala - the main and reference, the searchlight. Complete in the form of a. collimator, and

The linear raster moving progressively relative to the images of the collimator diaphragm obtained in the main and reference channels, and the electronic circuit of the signal processing from the photodetectors, the Forms (A propagating signal proportional to the phase difference of the signals in both channels.