SU1652805A1 - Non-contact position pickup - Google Patents

Abstract

The invention relates to an instrumentation technique and can be used to control the position of moving objects. In order to increase accuracy by converting the position to the duration of the reference pulses, four single vibrators 1–4 are inserted into the sensor. two flip-flops 5 and 6, compars 11, keys 9 and 10; a generator of 7 frequencies; a power bus 12 and a potential-free bus 13; the frequency of auto-oscillations at the output of the key 9 depends on the position of the metal or feromagnigung object with respect to the inductance coil 15. Divider 7 averages the duration of several periods and generates pulses across the front of which oscilloscopes 3 and 4 are triggered, forming time intervals differing by a certain amount. By decreasing the pulses from the output of divider 7, the one-oscillator 1 generates a synchronization signal for recording into triggers 5 and 6. determining the position of the metal object, the log 1 is written to the trigger 5. When determining the position of the ferromagnet, the log is recorded in the trigger b. About 2 Il. C /, C

Description

The invention relates to an instrumentation technique and can be used to control the position of moving objects.

The purpose of the invention is to improve the accuracy of the sensor by converting the position to the duration of the reference pulses.

FIG. 1 shows a block diagram of a sensor; in fig. 2 is a diagram of his work.

The sensor contains one-shot 1 4. triggers 5. 6. frequency divider 7, generator 8, which includes keys 9, 10, comparator 11, power bus 12, zero potential bus 13, capacitor 14 and jjKa 15 of inductance are connected to generator 8 .

The output of the comparator 11 is connected to the control inputs of the bale 9, 10. The outputs of the cathode through frequency divider 7 are connected to the inputs of single vibrators 1 2, the output of one vibrator 2 through single vibrators 3 4 connected to information inputs of the corresponding trigger points 5, 6

The sensor works as follows. While the inductance coil 15 does not interact with the object, at the output of the key 9, the oscillations have a frequency t, the frequency of the generator torus f0 is determined by the inductance and capacity of the oscillatory circuit.

about ate

N3 00 About SP

moreover, the influence of the active resistance of the circuit on the frequency is negligible. With a sharp change in the oscillatory frequency, the oscillation frequency is set to practically one to two periods of oscillation.

The key of the key 9 is supplied to the power supply unit / in which the duration is selected, equal to n periods of the input frequency, where n is 2 10, resulting in averaging the oscillation frequency for n periods. At the output of the one-cycle 2 a pulse begins (Fig. 2), on which the one-shot 3 and 4 are started, which generate pulses of the reference for the hoci i one-vibration 3 — the duration is tin (FIG. 26), the one-vibration 4 — the length -C i nj2 (FIG. 2h). At the end of the cycle

A chopping pulse is formed in the chophobraur 1 choke (Fig. 2d) for

. Ep 5 and 6 if sync; leu came earlier than the one-shot

- will finish the generation of the reference pulse,

-if the GROUND trigger 5 will be written 1, opposite 1, luchzr O.A1 Formation is recorded in trigger 6 from the output of one-shot jiopa 4. Reference pulse durations from tui and tu2 are selected so that dy tui is less than n periods of oscillations with a frequency f0 and long-term imp.ca longer.

Thus, in the initial state, in V tgero 5 O will be recorded, and in trigger 6

When a metal o5cct-3 approaches a coil 15 of the inductance, the frequency increases, which corresponds to the time ti (fsh 2g) of the synchronization pulse pulses from the output of block 1, h trigger 5

Record 1 will occur. And trigger B will remain in the initial state.

Claims (1)

As the ferromagnet and inductance 8 approaches, the frequency decreases, O flip-flop 6 is written down, and flip-flop 5 remains in the initial state. Invention Non-contact position sensor comprising an inductor, a capacitor and a generator with power and zero potential tires. The first output of the capacitor is connected to the first terminal of the inductor, the second terminals of the capacitor and the inductor are connected. respectively, to the first and second inputs of the generator, characterized in that, in order to improve accuracy, a frequency divider, four one-oscillators, two triggers are entered into it, and the generator is made as a comparator, the output of which is connected to the first inputs of the first and second keys, the second inputs of which are connected to buses of zero potential and power, the outputs of the first and second keys are the second input of the generator, the zero potential bus is the first input of the generator, the common output of the inductor and the capacitor is connected to the comparator input, the outputs of the first and second switches are connected to the input of the frequency divider, the output of which is connected to the inputs of the first and second single vibrators, the output of the first single vibrator connected to the inputs of the third and fourth one-shot, the outputs of which are connected to the information inputs of the first and second flip-flops, to the synchronous inputs of which the output of the second one-channel is connected pa zero potential line is connected to the second capacitor lead