SU1348637A1 - Displacement and length measuring device - Google Patents

Abstract

The invention relates to a measurement technique and can be used for highly accurate measurement of lengths and displacements. The purpose of the invention is to expand the range of continuously performed measurements by increasing the zone of stable operation of the device. The auxiliary laser radiation is mixed on the photodetector 18 with the radiation of the reference laser 1 and the frequency to be output enters the automatic frequency control system (AFC) 20, the input of which is connected to the auxiliary laser piezocorrector 21 optically coupled through mirrors 16 and 17 to the reference laser 1 The radiation of one of the measuring lasers is mixed at the photodetector 10 with the radiation of the reference laser 1. The difference frequency is recorded by a frequency meter 11. When the plate 4 is T-shaped and the corner reflector 5 deviates from the initial point Position is restored to their original position with the help of piezocorrector 21. When the beat frequency changes between the reference and measurement laser formed by the plate 3, the translucent semi-transparent U-shaped and installed on the side of the stand, the T-shaped plate 4 can be moved in the direction of propagation of the laser radiation, measure the amount of movement of the object. 1 il. CO / 1-4 CO 4: oo a oo

Description

113486372

The invention relates to the model 19 and to the auto-tuning system of the discrete technique and can be used (LPC) 20, the output of which is connected for high-precision measurement with a piezo-corrector 21. Lengths and displacements in a wide range quantities.

The purpose of the invention is the expansion of the reference laser of the continuously produced measurement 1, the auxiliary laser, the formation by increasing the area stabilized by the plate 4, the reflector 5 and the device operation.10. The measurement shows a block diagram of a laser, formed by plate-forming devices for measuring lengths and by fins 3 and 4, by a reflector 5, and by active displacements by elements 2 and 6.

The device contains a launcher. In the course of operation, the elements of the device 1, the measuring laser, and the formations are subjected to an external influence by the active element 2, plastics (temperature gradients, mechanics 3 and 4 and the corner reflector 5, vibration) causing a second measuring laser, the formation of the optical elements of the device by the active element 6, the plate of their initial interposition, by us 3 and 4 and the corner reflector 5, 20 can lead to errors when the auxiliary laser formed x per displacements. For exclusion of the active element 7, the plate 4 and none of these effects on the device with an angular reflector 5. The plates 3 use an auxiliary laser and 4 represent the composite parts with its frequency control system.

These reflectors, one of the plates (4) - 25, the auxiliary T-shaped laser radiation, is fixedly mixed on the photodetector 18 of the laser so that its stand is made with the radiation of the reference laser 1. You are translucent, located during emitted by the photodetector, the difference radiation of the auxiliary laser, the frequency (beat frequency) is transmitted by the angled reflector 5. 30 The AFC system 20 of the auxiliary Shelf of the T-shaped plate is made of a laser. When plate 4 is deflected and specularly reflective, and has a reflector 5 from their initial position during the radiation of the second measurement, the protrusion caused by external effects of the laser, the height of the skins, the AFC system 20 returns from 1/4 The wavelength of the radiation using the piezocorrector 21 reflects the torch 5 to the position in which the second plate (3) is translucent, the initial position on the П is standard, and the plates 4 and the reflector 5 are installed, corresponding to the stand side T-shaped plate is fixed 4, with the ability to move the beat-Q beat frequency as specified by the AF radiation propagation circuit. This ensures that the lasers are stabilized. The relative position of the plate 4

The corner reflector 5 and the plate and diffuser 5 in the measurement process, on 4 are common reflectors for the Measured value is all three lasers. Plate 3 is et- .g moving plate 3 relative to a common reflector for both measuring plate 4, for measuring lasers. Without this movement, a single measuring laser optically linked from measuring lasers, transduced through semi-transparent mirrors 8 example formed by plates 3 and 9 with the reference laser 1 and photoreceiver .. and 4, the reflector 5 and the active element 10 connected to the frequency meter 2 are mixed on the photoreceiver 11. The second measuring laser ke 10 with the radiation of the reference laser 1. optically connected the discharged through the translucent photodetector 10 raznost- mirrors 12 and 13 with the reference laser 1 at frequency (beat frequency) of the photodetector 14 and connected to the lasers () registers chas- frequency counter 15. The auxiliary laser totomerom 11.

optically connected through the mirrors 16 and, by changing the frequency of the beats of the inter- 17 with the reference laser 1 and the photo-reception by the reference and measuring laser NIC 18 connected to the frequency-meter when moving its mirror measures

3

c the magnitude of this displacement. This makes it possible to measure the movement within one intermode interval by the beat frequencies of the reference and measurement lasers.

In this process, any of the measuring lasers can be used. In case the end point of the measured movement is in the unstable zone of operation of one of the measurement lasers, a second measurement laser is used. Since the bases of the resonators of the measuring lasers are shifted relative to each other by a value of the order of / 4 (the shift is constant), their generation zones are also shifted by this value and overlap one another. This circumstance makes it possible to use both lasers alternately in those parts of the measured displacements, where the use of one of them is impossible or difficult, to measure the length of the resonator base of the measuring lasers, as well as to monitor the measured value by the signal of the second measuring laser in the rest of the measured displacements .

Claims (1)

Invention Formula A device for measuring lengths and displacements, comprising a reference laser, a measuring and auxiliary lasers with two common reflectors, two translucent mirrors, two photodetectors optically coupled through a semi-transparent mirrors with a reference laser and accordingly a meter Compiled by S. Grachev Editor I. Casarda Tehred M. Khodanich Proofreader M. Pojo Order 5178/39 Circulation 676 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 four five 0 lasers and auxiliary lasers, two frequency meters connected to the outputs of the corresponding lean photodetectors, a frequency auto-tuning system and a piezocorrector associated with it, mounted on one of the common reflectors, characterized in that in order to expand the range of continuously produced measurements, it is equipped with a second measuring laser, a third photodetector with a third frequency meter connected to it and a third translucent mirror, the second measuring laser is installed in parallel and in the same plane with the first one between the common reflectors, one of the reflectors is made of angled, the second is of two adjoining parts, one of which is a T-shaped plate, fixedly mounted so that its stand, made semi-transparent, is located during the radiation of the auxiliary laser reflected by the corner reflector, and the shelf of the T-shaped plate are made specularly reflective with a projection located during the radiation of the second measuring laser, whose height is equal to 1/4 of the radiation wavelength Another, a translucent U-shaped plate, mounted on the side of the stand of a T-shaped plate, can be moved in the direction of propagation of radiation from lasers, and the second reflector is connected through a third semi-transparent mirror with a reference laser and a third photodetector. five