RU1825979C - Phototachometer - Google Patents

Abstract

The invention relates to geodetic instrument engineering. SUMMARY OF THE INVENTION: a light range finder comprises a radiation source 1, a crystalline modulator 2, a transmission and reception optical system 4, 9, a photomultiplier 7. The optical closure line is made in the form of beam splitters 3. 6 and an optical fiber optical fiber located between them 5. The attenuator 10 is located on the receiving optical axis between the optical system 9 and the beam splitter 6, which makes it possible to form a constant value of the light flux arriving at the photomultiplier 7. 1 ill.

Description

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The invention relates to geodetic instrument engineering.

In high-precision light-range meters with photoelectric indications, an optical closure line (OL 3) is used to control the zero position - the path traveled by radiation between the optical elements integrated into the device.

The aim of the invention is to increase accuracy by allowing the formation of a constant value of the light flux entering the photomultiplier.

The drawing shows a diagram of a light-range finder.

The following are indicated in the drawing: 1 - radiation source, 2 - crystalline modulator, 3 - first stationary beam splitter (inclined plate), 4 - transmission optical system, 5 -. fiber optic fiber, 6 - the second fixed beam splitter (inclined plate), 7-photomultiplier, 8 - external attenuator (gray wedge), 11 - shutter.

The radiation from the source 1, passing through the modulator 2 and the beam splitter 3, enters the transmitting optical system 4. The part of the radiation reflected from the beam splitter 3 is sent to the fiber 5 and, passing through the fiber and reflected from the beam splitter 6. is incident on the photomultiplier 7, on which an external electrode 8, limiting the diameter of the light. The main radiation flux, reflected from the reflector, is received by the receiving optical

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system 9 and, passing the optical attenuator 10 (gray wedge), through the beam splitter 6 gets to the photomultiplier.

The damper 11, alternately closes one or another channel and allows you to work either in the distance mode or in the OLZ mode.

Claims (1)

SUMMARY OF THE INVENTION A light range finder comprising a radiation source sequentially arranged on a first optical axis, a crystalline modulator and a transmitting optical system, a receiving optical system and a photomultiplier sequentially located on a second optical axis, an optical closure line with first and second beam splitters located respectively between the modulator and transmitting optical system and between the receiving optical system and the photomultiplier, an attenuator located on the second optical si, and a shutter arranged alternately on the first optical axis and on the optical line of the closure, characterized in that. that, in order to increase accuracy by allowing the formation of a constant value of the light fluxes arriving at the photomultiplier, the optical closure line is made with a fiber optic fiber located between the beam splitters and the attenuator is located between the receiving optical system and the second beam splitter.