SU1379627A1 - Device for measuring distances - Google Patents

Abstract

The invention relates to the field of geodetic instrumentation. The purpose of the invention is to improve the measurement accuracy. When tensioning the working measure 1, the sensor 2 generates a signal that is fed to the input of the amplitude selector 3, the other input of which is connected to the generator 4. At the moment of equal levels of the signals at the input of the amplitude selector 3, the polarity of the output signal that is fed to the control input Schemes 6. In the ycrp-fee, the determination of the moment of counting at the moment of equality of the tension value of the flexible working measure 1 to the specified value is achieved. 2 Il. with: (L

Description

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The invention relates to geodetic engineering, in particular, devices for measuring the sides of polygonometric networks with rigidly fixed foam signs.

The aim of the invention is to increase the accuracy of measurements.

In figure 1, the block diagram of the device proposed is isoGfacene; 2 is a functional diagram of a write signal generator.

The device contains a flexible working measure 1, a microdisplacement sensor 2, an amplitude selector 3, a reference level generator 4, a pulse generator 5 on, a control block 6, the first 7 and second 8 pulse counters, a block 9 comp} {Eni, a single vibrator 10, raster a scale 11, a photoelectric sensor 12 and a recording unit, consisting of a pulse counter 13, a memory register 14, a decoder 15 and a digital indicator 16.

A flexible working measure 1 is connected to the sensor of the 2 interconnections, the signal from which is fed to the input of the amplitude selector 3, to the other input of the latter receives a signal from the generator 4 of the reference level. The signal from the output of the amplitude selector is fed to the input of control unit 6, the outputs are connected to the control inputs of counters 7 and 8. The counting inputs of the counters are connected to the generator of 5 pulses, and their outputs are to the inputs of the comparison unit 9, the output of which goes to the input of one vibrator 10, which forms the recording signal. The recording signal is fed to the control input of the register 14. The microdisplacement sensor 2 is connected to a raster scale 11, the amount of movement of which is read photoelectrically by the sensor 12. The pulses from the sensor 12 are fed to the input of the counter 13, the outputs of which are connected to the inputs of the memory register 14. The contents of the memory register are decrypted by the decoder 15 and displayed on the digital indicator 1 6.

The device works as follows.

During the tensioning of the working measure 1, the sensor 2 generates a signal arriving at the input of the amplitude selector 3 whose other input is connected to the generator 4 of the reference level. At the time of the detection signal levels at the input

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5 0 s 0

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the amplitude selector changes the polarity of the output signal, which is fed to the input of the control unit 6.

A recording sigil is formed as follows.

The signal from the output of the amplitude selector 3 is supplied to the shapers F1 and F2. If the signal from amplitude selector 3 is equal to logical 1, then (driver F1 generates a pulse arriving at the S input of trigger T, and sets the trigger to 1. This signal arrives at the control input of counter CT1 and enables it to work. If the signal from the amplitude selector equal to O, then Tejib F2 generates a pulse arriving at the R input of the trigger T, and sets the trigger to O. At the inverse output of the trigger appears the level of logic O that goes to the control input of the counter CT2. Thus, the counter CT1 counts and plays at si Nala selector output amplitude equal to 1 and the counter CT2 - when the signal output from the amplitude selector equal to O.

The counting results of the counters arrive at the inputs of the comparison circuit. If the results are equal, the input level () sets the logical level 1, according to which the driver generates a recording signal.

With tension in a flexible working condition, slowly damped oscillations occur. When the tension of the flexible working measure is less than a predetermined value, which is determined by the reference level of the amplitude selector, the number of pulses fed to the input of counter CT1 is less than the number of pulses fed to the input of counter CT2. When the tension value of a flexible working measure is greater than a given value, the number of pulses, arriving 1x at the input of the counter CT1, is greater than the number of pulses entering the input of the counter CT2. The equality of the results of the CT1 and CT2 counters comes at the moment of the equality of the tension of the flexible working measure to the given value. At this point, a measurement result write signal is generated in the memory register.

Thus, an unambiguous determination of the time of reference is achieved at the moment of equality of

tension of a flexible working measure to a given value.

Claims (1)

Invention Formula A device for measuring distances, containing a flexible working measure, a tension device, a micro-displacement sensor, an amplitude selector of a level generator, a one-shot, a counting unit and a recording unit, characterized in that, in order to improve accuracy, a pulse generator is introduced into it, and the second pulse counters, the comparison unit and the control unit, made in the form of two pulse shapers and an RS flip-flop, the outputs of which are connected to the control inputs Installation O of the first and second pulse counters The inputs of which are connected to the output of the pulse generator, the output of the amplitude selector is connected to the inputs of the pulse formers, the outputs of which are connected to the S and R inputs of the trigger, the outputs of the pulse counters are connected to the inputs of the comparison unit, the output of which is connected to the control input of the registering unit through the single vibrator . Fig: 2