SU1216644A1 - Protractor - Google Patents

Description

The invention relates to geodetic instrumentation and purpose; Chenot, in particular, for measuring angles by the time method.

The aim of the invention is to expand the range of values of the measured angles,

Figure 1 shows the block diagram of the goniometric device; Fig. 2 illustrates an ambiguity resolution unit.

The goniometric device (FIG. 1) contains a reference frequency generator 1 associated with a synchronous motor 2 rotating brand 3, and a block of 4 commands and counting, photo sensors 5 associated with an amplifier converter 6 associated with block 4, a block 7 and an ambiguity resolution unit 8, and a registration unit 9 associated with blocks 4.7 and 8.

The ambiguity resolution unit (Fig. 2) contains pulse shapers 10 and 11, the inputs of which are the inputs of the block, and the outputs are connected respectively to the inputs of inverters 12 and 13, the outputs of which are connected respectively to the inputs of the R5 trigger 14 connected to the outputs the first inputs of circuits 15 and 16, the second inputs of which are connected respectively to the outputs of the formers Yu and 11, and the outputs are connected to the inputs of the circuit OR 17, the output of which is the output of the block.

 One cycle of measuring the angle, the direction of which is determined by the position of the photosensors 5, consists in repeatedly measuring the time interval between the pulses of the photosensors that occur when the brand 3 passes through the photosensors on each of its turns. At that, time pulse unit 7, formed by amplifier-converter 6, generates pulses of the beginning and end of the time interval - equivalent to the angle; command and counting unit 4 performs pulse counting of the reference frequency generator 1 over a given number of revolutions of mark 3, resolution block 8 the ambiguity controls the rfocTb rules of alternation of pulses arriving at the inputs of the time unit 7. After the end of a given number of revolutions of mark 3 in the registration block 9, the result of the angle measurement is recorded.

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If the pulses of photosensors 5 are correctly interleaved both at the inputs of the ambiguity resolution unit and at its output, the level of logic zero is maintained, since short high-level pulses from the outputs of the formers 10 and 11 arrive at the And 15 and 16 circuits and end before the high signals The RS level of the trigger 14 after its switching by the same pulses passed, the inverters 12 and 13 are the delay lines. In this case, the ambiguity resolver does not affect the operation.

goniometric device.

If one alternates pulses at the inputs of the block of ambiguity or they coincide in

time, which corresponds to the value of the measured angle O, there is a coincidence of high levels at the inputs of one of the circuits AND, which causes the appearance of a pulse at the output of the circuit

OR 17 and the subsequent zeroing of the erroneous measurement result in block 9 registration.

Claims (1)

Invention Formula A goniometric device containing a reference frequency generator connected to a synchronous motor, on whose shaft a mark is fixed, and the first input of a command and counting unit, photo sensors connected to an amplifier: a converter, the first output of which is connected to the second input of a command and counting unit, a unit time, the inputs of which are connected to the second and third-party outputs of the amplifier-converter, and the output to the first input of the registration unit, the second input of which is connected to the output of the command and counting unit, characterized in that In the set of measured angles, an ambiguity resolution block is introduced in it, made in the form of two pulse formers, two inverters, RS trigger, two AND schemes and OR circuit, the inputs of the first and second pulse formers are connected to the inputs of the time block, the outputs of the first and The second pulse shaper is connected to the inputs of the first and second inverters, respectively, the outputs of which are connected to the RS trigger inputs, direct and 31216644 the inverse outputs of which are connected to the first and second formers with the first inputs of the pulses, respectively, the outputs of the AND circuits are connected to the first and second AND circuits, the second inputs to the OR circuit, the output of which is connected to the outputs of the third input recorder. SF & (yjjp -f. f Editor N.Egorova Compiled by V.Lgapova Tehred M. Larotsay Proofreader S. Shekmar Order 993/51 Circulation 671 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Filial ShSh Patent, g, Uzhgorod, st. Project, 4