SU1303811A1 - Transducer of linear shifts - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure linear displacements. The goal — an extension of the measurement range and an increase in noise immunity — is achieved due to the fact that the winding 7 of the measuring array 5 is completed with taps that are located at equal distances, and is powered from the generator 10 through the block 4 of the elements AND 4.I-4, N, switched by the counter 1 and the decoder 3. In this case, in the section of the winding 7 located opposite the readout winding 8, when switching, the phase of the signals is changed from the generator to 180 and the measuring signal is generated. 1 hp ff. 1 il. i (L with 00

Description

one

The invention relates to a measurement technique and can be used to measure linear displacements.

The purpose of the invention is to expand the measurement range of the functionality and increase the noise immunity by reducing the length of the measuring bar.

The drawing shows a block diagram of a linear displacement sensor.

The device contains the first 1, second 2 counters, the decoder 3, included at the output of the first counter 1, block 4 of the two-input elements AND 4.1 - 4.N5 measuring ruler 5 and the movable carriage 6, winding 7 placed on ruler 5, reading the winding 8, a spacing (on a movable carriage 6, a capacitor 9- connected in parallel to the winding 8, a generator 10, a divider 1 connected between the generator outputs and the counting inputs of counters and 2 serially connected amplifier 12, phase detector 13, differentiating chain 14 and element I 15, sequentially Connections amplitude detector 16 th integriruyup chain 17 and a trigger

18 Schmidt, the output of which is connected to the second input element And 15, register

19, the inputs of which are connected to the outputs of the second counter 2, and the control input to the output of the element

And 15. Counter 1 has a capacity of Nj counter 2 - capacity 2N,

The device works as follows.

IryyGg counter 1 is switched by pulses coming from the output of the frequency divider 11. The state of the counter 1 is decrypted by the deprafraser 3. The signal of the logical 1 from the outputs of the decoder 3 is sequentially fed to the second input of the AND 4.1-4 elements, the N block 4 of the two-input And elements,

In this case, successively at the outputs of the elements 4.1-4 .N.N, bursts appear. The number of pulses in the batch equals the division factor of the frequency divider 11. In the first state of the counter, 1 pack appears on the 1st input of the first element AND 4.1, with the second - n;) the output of the second element And 4.2, with N-M - at the output of the N-th. element And 4, N, On the remaining outputs of the elements And with the presence of the f

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A3811 2

The signal is a logical O. The winding 7 of the measuring line 5 is made by printing in the form of separate sections or as a whole and contains N outputs. The distance between the pins determines the resolution of the sensor,

When a burst of pulses appears at the first output of the winding 7, the current flows from the first output to the second, when it appears on the second - from the second to the first and to the third, on the third - from the third to the second and to the fourth, etc. In other words, with each subsequent movement of the pulse packet, the direction of the current in the switched winding section changes direction, which corresponds to a phase change by an angle Ti. When moving a pack of pulses along the length of the winding 7 of the measuring range 5 in the winding 8 of the moving carriage 6, an EMF is induced. The winding 8 of the movable carriage is wound on a ferrite core, which has the ability to move along with the carriage along the winding 7. At the time of passing the pulse train of the winding 7 through the location of the winding 8 of the movable carriage, determined by the movement x, which corresponds to

x P k, where is the distance between the terminals

windings 7 |

k is the current value of counter 1, phase-wired ECS is induced in winding 8, which is amplified by amplifier 12 and fed to inputs of phase 13 and amplitude 16 detectors. With the amplitude detector 16, the packet is detected and through the integrating chain 17 enters the input of Schmidt trigger 18, which changes its state. The purpose of this circuit is to prepare the device for operation. Only the appearance at the input of the amplifier I2 of a long burst of pulses allows the device to make a measurement. If single pulses appear at the input, then the integrating chain 17 does not allow Schmidt trigger 18 to switch. The measuring pulse is generated by a phase detector 13, which compares the phase of the pulses from the generator output 10 and from the output of the amplifier 12. P that corresponds to the change 30

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3130

The direction of the current in the winding section 7, the voltage of the phase detector varies from a negative value to a positive value. This voltage is differentiated by the chain 14 and at the output of the element 15, if there is a signal at the output of the 18th IIDt signal, at the moment the voltage changes from negative to positive, an impulse of information is generated. The amount of movement is determined by the state of counter 1 by the above expression. The counters are synchronized by connecting the last trigger of the second counter 2 to the input. Setting the zero of the first counter. Since the first counter has N states, and the second 2N, when the N states of the second counter 2 change, the first one is set to O. The first state O of the first counter 1 continues during the second N states of the second counter 2. Then the counter counts 1 , 2 occurs synchronously. The sampling of the state of the counter 2 into the memory register is carried out by the sampling signal from

element and 15,

Claims (2)

Invention Formula 1, Linear displacement sensor, containing a measuring ruler with a printed winding applied to it, a movable carriage with a read winding placed on it, located with a gap relative to the undercarriage carriage, characterized in that with a widening range. M. Kelemeg Editor Order 1295/39 Compiled by V. Nikolaev. Techred N.Glushchenko Proofreader M. Demchik Circulation 678 Subscription VINILI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Free-printing enterprise, Uzhgorod, st. Project, 4 114 the measurement and noise immunity enhancement zone, the winding of the measuring ruler is made with taps located at regular intervals, and the sensor is equipped with first and second slashes, a decipheror, whose inputs are connected to the outputs of the first counter, a block of two-input elements I, the first inputs of which are connected to the outputs of the identifier, and the outputs - with the leads of the ruler winding, connected in series by a generator, the output of which is connected to the BTOpbiM inputs of the two-input AND elements, and a divider whose output is connected to the counter m inputs of counters, the output of the higher bit of the second of which is connected to the reset input of the first by a series-connected amplifier, the input of which is connected to the output of the matching winding, a phase detector, the reference input of which is connected to the output of the generator, and a differentiating chain connected in series by an amplitude detector integrating the chain and a 1Chmidt trigger, an AND element, the first input of which is connected to the output of the differentiating chain, and the second input to the output of the Schmidt trigger, and the memory register, inputs which is connected to the outputs of the second counter, and the control input is connected to the output element And, 2. The sensor pop. 1, which is distinguished by the fact that, in order to increase the sensitivity, it is equipped with a capacitor connected in parallel with the winding.