SU1551974A1 - Displacement transducer - Google Patents

Abstract

The invention relates to a measurement technique and can be used in instrument engineering for the remote measurement of linear and angular values. In order to increase accuracy by increasing the maximum duration of the information pulse relative to the period T of synchronization pulses, a transformer 2, an adder 7, an amplifier 8, a comparator 9, a switch 10, a trigger 12, an integrator 14 and a zero-potential bus 16 are inserted into the converter. Since the second output of the sync pulse generator 11 produces an asymmetric rectangular voltage with a duty cycle (T / Τ) * 982, and the output of the generator 13 current pulses through the secondary winding 6 of the transformer 2 is connected to the input of the integrator 14, the trigger 12 generates output pulses with a maximum the duration of the information signal Τ _max Τ / 2, which ensures the achievement of this goal. 4 il.

Description

Fig.}

The invention relates to a measurement technique and can be used in instrument engineering for the remote measurement of linear and angular values.

The purpose of the invention is to improve the accuracy by increasing the maximum duration of the information pulse relative to the period of the synchronization pulses.

FIG. 1 is a block diagram of a converter with a transformer sensor; in fig. 2 shows a transformer sensor in the form of an inductive differential sensor 4; in FIG. 3 and 4 - timing charts of the converter.

The converter contains a transformer sensor), a transformer 2, including windings 3-6, an adder 7, an amplifier 8, a comparator 9, a switch 10, a clock generator 11, a trigger 12, a current pulse generator 13, an integrator 14, a potentiometer 15, a zero bus 16 potential, inductive differential sensor 17.

The generator 11 clock pulses is designed as a generator of asymmetric pulses of a rectangular Form with a duty cycle

8), where T is ne

Tt

- 2 (eg vehicle

v

Pulse sequence time, s / - generator pulse duration. The first output of the generator 1 is connected to the signal input of the generator 13 current pulses. The second and third outputs of the generator 11 are connected respectively to the first input of the switch 10 and the S input of the trigger 12.

The current pulse generator 13 is made with an amplitude control input to which the winding 5 of transformer 2 is connected. The winding 6 of the transferor 2 through the integrator 14 is connected to the first input of the comparator 9, the output of which is connected to the second input of the switch 10, the output of which is connected to the R input trigger 12.

Extreme winding pins 3 of transformer 2 are connected to winding pins of sensor 1 or sensor 17 and extreme pins of potentiometer 15, the slider of which is connected to the first input of adder 7, the output of which through amplifier 8 is connected to the second input of comparator 9. Date winding is connected to second input of adder 7

five

0 5

about

five

about

45 jq

55

The sensor is 1 or the middle output of the sensor 17. Potentiometer 15 allows you to adjust the starting point.

The Converter operates as follows.

The generator 13, excited from the first output of the generator 11 by rectangular pulses and controlled by the feedback circuit from the voltage from the winding 5 of the transformer 2, produces current pulses to the winding 4 and generates square voltage pulses on it (diagram K, Fig. 3 and 4). The second and third outputs of the generator 11 produce short control pulses (diagrams L and M), the interval between which determines the maximum duration dx of the information pulse. In the Control position of the switch 10, both of these pulses set and reset the trigger 1 2 and produce at its output a calibrated and maximum duration informational component of the output pulse. In measurement mode, switch 10 is set to the Operation position,

The integrator 14 converts the rectangular voltage pulses of the winding 6 of the transformer 2 into triangular voltage pulses (P charts, FIG. 3 and 4). The linearity of the pulse forms is ensured by a high gain of the integrator operational amplifier and control of the operation of the generator 13 through the circuit from the winding 5. The voltage from the output of the integrator 14 is fed to the first input of the comparator 9. The pulse signal from the output of sensor J or 17 is summed in the adder 7 with the signal correction, taken from the potentiometer 15, and forms the input signal at the input of the amplifier 8. The amplified signal (diagrams N of Fig. 3 and 4) is fed to the second input of the comparator 21. At the moments of equality of the voltages, the comparator is 21 a reset pulse to flip-flop 12 (Q diagram fig.Z and 4). As a result of the arrival of the starting pulse from the third output of the generator 11 and the reset pulse from the comparator 9, the trigger 12 generates a pulse at its output (diagrams R of Fig. 3 and 4), the duration of which is proportional to the value of the output signal of the sensor 1 or 17.

Fi, ъ.2

to L

m

Claims (1)

Claim A displacement transducer comprising a clock generator, a current pulse generator and a transformer sensor, an output of a clock generator connected to a signal input of a current pulse generator, characterized in that, in order to increase accuracy, a transformer and an integrator are introduced into the current pulse _; potentiometer, an adder, an amplifier, a comparator, a switch, a trigger and the tire ground potential, clock generator adapted to output pulses with greater than two skvazhennostyu and output the start pulse and the current pulse generator configured to amplitude control input of the pulse generator output current through per- ₂ The primary winding of the transformer is connected to the bus of zero potential, the intermediate terminal of the primary winding of the transformer is connected to the control input of the generator amplitude of 25 current pulses, the bus is zero sweat through the first secondary winding of the transformer and the integrator is connected in series to the first input of the comparator, the output of which is connected to the first input of the switch, the output of which is connected to the R-input of the trigger, the beginning and end of the second secondary winding of the transformer are connected respectively to the first and second extreme terminals of the potentiometer and, respectively, to the beginning and end of the primary winding of the transformer sensor, the secondary winding of which is connected between the zero potential bus and the first input a torus, the output of which through the amplifier is connected to the second input of the comparator, the potentiometer engine is connected to the second input of the adder, the zero potential bus is connected to the midpoint of the second secondary winding of the transformer, and the pulse outputs with a duty cycle greater than two and the start pulse of the clock generator are connected respectively to the second input of the switch and S-trigger input. Fig.? Fig.Z FIG. b