SU1188538A1 - Arrangement for measuring linear dimensions of transparent or semi-transpranent bodies - Google Patents

Abstract

A DEVICE FOR MEASURING VERTICAL DIMENSIONS OF A TRANSPARENT OR SEMI-TRANSPARENT BODY, including an optically coupled directional radiation source, a sweep assembly, a cylindrical lens, a focusing lens and a photodetector, and an amplifier, a filling pulse generator connected to it, and a pulse counter, characterized by a pattern, which is connected by means of a pattern and a pulse generator connected to it, a filling pulse generator and a pulse counter, which is different in that it is used with a drawing that is connected to it. to increase measurement accuracy, it is equipped with an optical phase inverter installed after the cylindrical lens, a second focusing lens and a second photodetector, optically connected to the source directional radiation, a second amplifier, first and second triggers, a frequency doubling circuit, a three-input coincidence circuit, a single vibrator, a two-input coincidence circuit, and a logical switching unit for filling pulses, the output of the second photodetector being connected to the input of the second amplifier; the installation inputs of the first and second triggers and the first and second inputs of the three-input coincidence circuit, the inverse output of which is connected via a one-shot with its third input, the installation inputs of the trigger unit and the installation input account (the pulse pulse, the output of the first and second triggers are connected respectively to the first and second inputs of the logic unit and the two-input coincidence circuit, the inverse output of which is connected to the third input of the logic unit, generator output 00 the filling pulses are connected to 00 with the fourth input and through the frequency doubling circuit with the fifth input of the logic unit, the output of which from 00 is connected to the counting input of the counter, the output of the counter is the output m device.

Description

one

The invention relates to a measuring and measuring technique and can be used in various parts of the national economy for measuring the width of flat transparent or translucent bodies, for example mica plates in the mica processing industry.

The aim of the invention is to improve the measurement accuracy.

FIG. 1 shows a device with a signal processing circuit; in fig. 2 - time diagrams for example, SRI.

The device contains a directional radiation source 1 (laser), a scanner unit 2, a cylindrical lens 3, an optical phase inverter 4 consisting of a translucent mirror 5, a mirror 6 and two cylindrical lenses 7, two focusing lenses 8 and 9, two photodetectors 10 and 11, two amplifiers 12 and 13, one-shot 14, three-input matching circuit 15, two Tpifrrepa 16 and 17, oscillator 18, frequency doubling circuit 19, two-input matching circuit 20, three logic circuits AND 21-23 and logic circuit OR 24 constituting a logic unit 25 switching pulses, counter 26. zmer emy object 27 is placed between the optical phase inverter 4 and the focusing lenses 8 and 9.

The radiation source 1, the scanner unit 2, the cylindrical lens 3, the optical phase inverter 4 and the photodetectors 10 and 11 are optically interconnected. The outputs of the first and second photodetectors 10 and 11 are connected respectively to the inputs of the first and second amplifiers 12 and 13, the outputs of the first and second amplifiers 12 and 13 are connected respectively to the installation inputs of the first and second triggers 16 and 17, as well as the first and second inputs of the three-input circuit 15 matches, the inverse output of which is connected through the one-shot 14 with its third input, the installation inputs of the trigger unit 16 and 1.7 and the installation input of the pulse counter 26, the outputs of the first and second triggers 16 and 17 are connected respectively to the first and and the second logic block 25 and two-input input circuit 20 coincidences inverse output of which soe5382

It is connected to the third input of the logic unit 23, the output of the pulse generator 18 is connected to the fourth input and through the frequency doubling circuit 19 to the fifth input of the logic unit 25, the output of which is connected to the counting input of the counter 26, the output of the counter is the output of the device OR 24 is connected to the outputs of the AND 21-23 logic circuits, the first input of the AND 21 logic circuit is connected to the first input of the AND 22 logic circuit and is the first input of the logic block 25,

The first input of logic circuit 23 is connected to the second input of logic circuit 22 and is the second input of logic block 25, the second and third inputs of logic circuit 21 are connected to the second and third inputs of logic circuit 23, respectively, and are the third and fourth inputs of logic block 25, the third input of logic circuit 22

is the fifth input of logic block 25, and its output is the output of logic circuit OR 24.

The device works as follows.

in a way.

The beam of the directional radiation source 1 is fed to one of the mirrors of the scanner unit 2, which, when rotated, turns the beam in a plane. Passing through lens 3, the beam is converted into a light strip with a parallel path of rays. Further, the passage through the measured object 27 and lens 9, all the rays converge at the focus of the lens 9, where the pupil of the photodetector 11 is located. Part of the light flux after the cylindrical lens 3 branches through the optical phase inverter 4, where the beam is reflected twice from the semi-transparent mirror 5 and mirrors 6, passes through two cylindrical lenses 7, which invert its scanning phase. Further, this beam intersects the plane

the path of the main beam along the scanning line of the measured object 27 and is focused by the lens 8 on the photodetector 10. As a result of this design, two beams are formed,

which synchronously move towards each other (counter scanning) and probe the opposite edges of the object being measured. 27. FIpH expanding two optical rays in the scanning zone they light up the photodetectors u and 1 1. The signals from the photodetectors are amplified by amplifiers 12 and 13, at the output of which voltage levels in the form of logical units are shown in (diagrams 1 and 2 in Fig. 2). At the inputs of the three-input scheme of 15 coincidences, three 1 - two with amplifiers 12 and 13 and with a single vibrator appear. Matching circuit 15 triggers (Diagram 3) and performs the following actions: puts T1zigger 16 and 17 to 1, erases the previous information in counter 26, writes a definable number proportional to the scan width in it, and starts the one-shot 14, which immediately returns a circuit 15 initial state. At the moment when a photodetector is obscured by the edge of the measured object 27, at the output of one of the amplifiers, the voltage level decreases, which triggers the corresponding trigger 16 and 17 to O (diagram 5 and 6). The second edge of the measured object 27 obscures the second photodetector, respectively, the second trigger is tilted. The interference signal from any internal defect does not change the further state of the triggers. At the first moment when the triggers 16 and 17 stand in 1, the coincidence circuit 20 blocks the AND 21 and 23 circuits. As a result, the stable frequency pulses from the generator through the frequency doubling circuit 19 and the logic circuits 22 and 24 are passed to the input of the subtracting counter 26 ( figure 7). At the second moment, when one of the flip-flops 16 and 17 overturns into O, the circuits 20 and 22 are blocked, and the pulses, directly from the generator 18, either through the circuit 21 or 23, again arrive at the input of the counter 26. At the third moment, when the second trigger is overthrown in O, the circuits 20-23 are blocked, the flow of pulses to the counter is stopped. Thus, when scanning to the first edge of the object being measured, the pulses to the input of the subtractive counter with the number recorded in it earlier pass at a frequency twice as high as the generator frequency, and from the moment the first edge is fixed with one beam to the edge of the measured object, the second beam arrives with the frequency of the generator. As a result of the subtraction, a number proportional to the width of the measured object in each scan line remains in the counter.

eleven

FIG. 2

Claims (1)

DEVICE FOR MEASURING LINEAR DIMENSIONS OF TRANSPARENT OR SEMI-TRANSPARENT BODIES, including optically coupled directional radiation source, scan unit, cylindrical lens, focusing lens and photodetector, as well as an amplifier connected to it a filling pulse generator and a pulse counter, characterized in that, with the aim of increasing accuracy of measurements, it is equipped with an optical phase inverter installed after the cylindrical lens, a second focusing lens and a second photodetector, optically coupled to the source radiation, a second amplifier, first and second triggers, a frequency doubling circuit, a three-input coincidence circuit, a single vibrator, a two-input coincidence circuit and a logic pulse commutation switching unit, the output of the second photodetector connected to the input of the second amplifier, the outputs of the first and second amplifiers are connected respectively to the inputs zeroing the first and second triggers and the first and second inputs of the three-input coincidence circuit, the inverse output of which is connected through a single-shot to its third input the house, the installation inputs of the trigger unit and the installation input of the pulse counter, the outputs of the first and second triggers are connected respectively to the first and second inputs of the logic block and the two-input coincidence circuit, whose inverse output is connected to the third input of the logic block, the output of the fill pulse generator is connected to the fourth input and through the frequency doubling circuit with the fifth input of the logic unit, the output of which is connected to the counter input of the counter, the counter output is the output of the device. SU .. „1188538>