RU2816696C1 - Jet-photocompensated digital-to-analogue converter - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to converter of discrete and analogue values, specifically to pneumatic-electric digital-to-analogue converters. Jet-photocompensated digital-to-analogue converter consists of a pneumatic input part, a photovoltaic comparator, an electrical bridge circuit and a secondary device that records an analogue signal, wherein pneumatic part is a row of nozzles, normally located to sensitive element. that is plate, rigidly fixed together with reflecting beam indicator mirror, on galvanometer loop. Principle of operation of the jet-photocompensated digital-to-analogue converter is based on the use of the effect of force action of the jet, which provides high accuracy of conversion due to the linear static characteristic.

EFFECT: high conversion accuracy.

1 cl, 1 dwg

Description

The invention relates to the field of converters of discrete and analog signals, in particular to pneumoelectric digital-to-analog converters (DACs).

A pneumatic digital-to-analog converter device is known from the prior art, based on summing the conductivities of pneumatic discrete input signals and converting them into an analog output signal with the total conductivity [1]. The pneumatic resistances are adjusted according to the increasing number of binary digits. The DAC contains n parallel variable resistances, the conductivities of which form a series corresponding to the number of binary digits. All parallel resistances are combined into a single input channel to the amplifier, covered by feedback. The output of the DAC is equal to the pressure corresponding to the sum of the applied pressures in binary code.

The disadvantage of this DAC device is its low accuracy, due to the difficulty of adjusting the conductivity of the resistances and their dependence on changes in environmental parameters.

The technical result that is achieved in the present invention is to increase the accuracy of converting discrete pneumatic signals, represented in binary code, into a continuous electrical analog signal.

To achieve this goal, a jet-photocompensation DAC is proposed, consisting of a pneumatic input part of the converter, a photogalvanometric comparator, a bridge electrical circuit and a secondary device, characterized in that the pneumatic input part is a series of nozzles normally located to the sensing element - a plate rigidly fixed together with a mirror reflecting the beam pointer, on the galvanometer loop. Moreover, the nozzles are located from the center of rotation of the plate at distances proportional to the binary code of the digital part of the converter.

In fig. Figure 1 shows a diagram of an inkjet-photocompensation DAC, consisting of a sensitive element - a plate 1 , rigidly mounted on guy wires 2 , a digital circuit 3 with nozzles 4 normally located to the plate, spaced from the center of symmetry of the moving system at distances according to the weight of binary codes. Pressure in front of the nozzles are maintained equal. Under the influence of the moments of force pressure of the jets of the digital circuit 3, the angle of rotation of the plate 1 changes, recorded by the optical part of the converter, which includes a light source 5 , which supplies a beam of light through a condenser 6 and a diaphragm 7 to the mirror 8 of the galvanometer 9, the frame of which is placed in the field of a permanent magnet 10 A beam of light reflected from mirror 8 falls on a differential photoresistor 11 , connected to an electrical bridge circuit 12 , which consists of a voltage source and resistances R1, R2, And . Output current in the feedback circuit, the corresponding analog value of the digital code is recorded by milliammeter 13 and returns the moving DAC system to its original state.

Bibliographic data

[1]. Berends T.K., Efremova T.K., Tagaevskaya A.A., Yuditsky S.A. Elements and diagrams of pneumatic automation. M., Mechanical Engineering, 1976, pp. 161-163.

Claims (1)

Jet-photocompensation digital-to-analog converter, consisting of a pneumatic input part of the converter, a photogalvanometric comparator, a bridge electrical circuit and a secondary device, wherein the pneumatic input part is a series of nozzles normally located to the sensing element - a plate rigidly fixed together with a reflecting beam pointer mirror and frame galvanometer on stretch marks of the movable galvanometer system, and the nozzles are located relative to the center of symmetry of the movable galvanometer system at distances proportional to the weights of the bits of the binary code, the pressure P in front of the nozzles is maintained equal, and the light beam reflected from the mirror falls on a differential photoresistor included in the electrical bridge circuit.