SU1702165A1 - Linear displacement converter - Google Patents

Abstract

The invention relates to a measurement technique and can be polished to measure linear displacements. In order to improve the accuracy of the converter containing power supply unit 1, differential transducer sensor 2, amplify 3, zero potential bus 9, sampling and storage device 4, analogue digital converter b, synchronization unit 6, clock generator, buffer resistor 8 Due to the addition of signals from two oppositely connected windings directly in the sensor 2 and the synchronous separation of the amplitude and phase information, the device 4 of the sample and storage provides a high thermal conductivity. mations movement into a code which is determined by the accuracy of the oscillator frequency stability of 7 clock pulses and the corresponding choice of clarity bit analog-to-digital converter. 2 Il.

Description

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

The purpose of the invention is to improve the accuracy of the converter.

Cha FIG. 1 shows a block diagram of a linear displacement transducer; FIG. 2 is a timing diagram of the voltages in the respective block diagrams;

The linear displacement transducer contains a sensor power supply unit 1, connected to the primary coil of the differential transformer sensor 2, the secondary counter-connected windings of which are connected to the signal input of amplifier 3 and zero-potential bus 9 The output of amplifier 3 is connected to the analog input signal through device 4 -digital converter 5 right-hand inputs of the device 4 sampling-storage and

A / D converter 5 is connected to the second output of synchronization unit 6, the first output of which is connected to the synchronization input of the sensor power supply unit 1, and the input of unit 6 to the output of the clock generator 7. The output of the analog-digital converter 5 is connected to the buffer register 8, the control input of which is connected to the output of readiness of the analog-digital converter 5.

The linear displacement transducer operates as follows. Stable frequency pulses (Fig. 2a) from the clock generator 7 arrive at the input of synchronization unit 6, where pulses with a duty cycle (Fig. 26) are formed to synchronize the sensor supply unit 1 and short pulses (Fig. 2c). a) strobe the device 4 storing the storage and start the analog-to-digital converter XI

ABOUT

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ate

l 5. During the first (O 7/2) half-cycle of synchronization pulses (Fig. 26) in the sensor supply unit 1, a positive half-wave sinusoidal voltage supply of the sensor (Fig. 2d) is formed, during the second half-period (T / 2 - T) - negative (Fig. 2d)

Thus, the sensor power supply unit 1 supplies the primary winding of the differential transformer sensor 2 with a sinusoidal voltage synchronous with the pulses (Fig. 26) of the synchronization unit 6, whose frequency stability is determined by the stability of the clock generator 7 and can be quite high (for example, using a quartz crystal). generator)

The secondary windings of the differential transformer sensor 2 are turned on in such a way that the signals from them are folded counter-phaeno in the sensor, which ensures high temperature stability of the differentiation operation. With the counter-connected secondary windings of the differential transformer sensor 2, the output signal, the amplitude and phase of which depend on the position of the core, is amplified in amplifier 3 to the level of operation. Analog-g ifyoge transform 5 and is fed to the device 4 sample-storage-p which leads The sampling value of the signal from the gating pulse pulse (FIG. d) of the synchronization block O and storing this is O until the next pulse, and the LEVELING of the pulse is built into the loop so that the sample is amplified by the amplitude value of the signal.

When the position of the sensor connected with the mechanical connection to the object from the lerhenium h is changed relative to the secondary windings of sensor 2 in the direction of one or another winding, the output signal varies in amplitude from 0 to UH and when passing through the average phase position by 180 ° FIG 2e).

Sampling device -4 captures the signal change both in amplitude and phase due to synchronization with respect to the supply voltage of sensor 2 and provides a value at the level output and the sign of which varies from minus UH to UH depending on the position of the core (Fig 2e )

Analog-to-digital converter 5 with a two-pole input signal, pulse-gated by gating pulse pgch; dissolves voltage from yciprnicv A

sampling-storage in a binary count for eliminating dips in the output ode during the conversion cycle of the analog-digital converter 5 according to the readiness signal (Fig. 2g); the code corresponding to the relocation of the core (Fig. 7h) is rewritten into the buffer 8

 In other words, due to the addition of signals to the oppositely connected windings directly in the sensor, synchronous

extraction of amplitude and phase information yci by BL, (orkyr, ne nenich, a high rate of conversion is obtained — interlacing into the code of the exact frequency determined by the frequency generator) of the generator of pulses, go-pulses, 1/1 or 3 times, the beat of the racter, the pulses, the pulses, the pulses, the pulse, the frequency of the pulse, the frequency of the pulse, the pulse, the pulse, the pulse, the frequency of the pulse, the frequency of the pulse, the pulse, the pulse, the frequency of the pulse, the frequency of the pulse, the frequency of the pulse, the frequency of the pulse, the frequency of the pulse, the frequency of the pulse, the signal converter

Forglup acquisitions

Linear displacement transducer with /. Reductive power supply unit differential e i i i i jji JbiH control unit format sensor / sp / n shi zero connection subtitle ivio to the beginning of the first secondary semi-optk.1 sensor whose end is connected at the OHL y the second sub-walkway DAT RL, the power supply of the primary of MCTKv for dl 1k is connected to the bus. It is different from the fact that, due to the increase in accuracy, it was introduced into it the timing of clock signals and sampling devices, sampling devices v. xpr-nechi anapogo-tif all converter and buffer register, high-energy generator

T CLOSE pulses connected to the input of the synchronization blockch the first output of the cathode

Yudklyuch-.n to the entrance of the nwr, and into the hero

sync block output

Synchronous device of external vision and storage and an initial digital converter, the information code of which is divided into the data input of the buffer register of the amplifier amplification - to the signal input

The device is sampled and stored, the output is connected to the signal input of the anapo-digital converter, the output of which is synchronous to the sixth register register

Claims (1)

Claim Linear displacement transducer. containing a power supply unit, a differential transformer sensor, an amplifier and a zero potential bus connected to the beginning of the first secondary half-winding of the sensor, the end of which is connected to the end of the second secondary half-winding of the sensor; -gial, different heme, that. in order to improve accuracy, a clock generator, a synchronization unit, a sampling and storage unit, an analog-to-digital converter and a buffer register are introduced into it, the output of a clock generator is connected to the input of the synchronization unit, the first output of which is connected to the input of the power supply, to the hero output the synchronization unit is connected to the synchronization devices of the sampling and storage device and an analog-to-digital converter, the information code of which is connected to the data input of the buffer register; the output of the amplifier is to the signal Sample entry device and storage, the output of which is connected to the signal input of the analog-digital converter whose output is connected to the synchronization clock terminal. buffer register. ; 4.2165