SU1355941A2 - Device for measuring increment in resistance of resistance transducer - Google Patents

Abstract

The invention relates to a measurement and control technique. The purpose of the invention is to improve the measurement accuracy of the resistance increment of a resistive sensor is achieved by eliminating the influence of the communication link parameters. For this purpose, two capacitors 5 and 13 are additionally introduced into the device. The drawing also shows a generator of two double-pole current pulses of equal duration and amplitude, a recording unit 2, a control unit 3, a resistive sensor 9, diodes 11 and 12; resistors. The resistance of the resistive sensor 9 is determined in the recording unit 2 according to the algorithm described in the description of the invention. Block 2 is recommended to be performed with a voltage-code converter at the input. The control unit 3 may be designed as a pulse distributor. 1 il. from O5 SP of the joint venture; about 4 MS)

Description

 -1355941

This invention relates to the technique of polarity. At the time of measurement and control of resistance

t T at the output of the transformer appears tangible ({d

resistive sensor.

The aim of the invention is to increase the accuracy of measuring the resistance impedance of a resistive sensor by eliminating the influence of communication link parameters.

The drawing shows the structure-ig on the device diagram.

The device contains a generator of two double-pole current pulses of equal duration and amplitude, a recording unit 2, a control block 3, the output of which is connected to the control inputs of the recording unit 2 and a double-pole generator 1, the two outputs of which are connected to the first and second inputs the wires of the communication line 4, with the first and second inlets; The home of the registering unit 2, in addition, the input of the second wire of the communication line 4 is connected to the common wire of the control unit 3, the first capacitor 5 25 is connected to the first output of the first wire of the communication line 4, consisting of parameters 6, 7 and 8, the output The second wire of the communication line 4 is connected to the common connection point of the resistive sensor 9 and the reference resistor 10, and the second output of the resistive sensor 9 is connected to the anode of the nonlinear element with one-way conductivity (diode) 11, the cathode of which is connected to the second output of the capacitor 5 and the anode of the second non-linear element with one-sided conductivity (diode) 12, the cathode of which is connected to the second output Q of the model resistor 10 and the capacitor 13, the second output of which is connected to the output of the second wire of the communication line 4.

t T at the output of the transformer appears tangible ({d

and, 1 (c.B.V.)., “

(one)

, + R.

where R ,, Rj and R, are the resistance of parameters 6,7 and 8 of line 4, respectively; R- - resistance of diodes 11 and 12;

 " -" one /

Itl

with

- the voltage on the capacitor 13, At this moment on the capacitor 5, there is also a certain voltage. However, since the capacitors 13 and 5 are different in order, and the currents flowing through them are the same, the voltage across the capacitor 5 can be neglected,

The second measurement is made at the moment when the capacitor 13 is charged, t, e, at t, 10tj 1006. The input voltage of the recording unit J is determined by the expression

.-I (R, | -: i; i) “,, (2)

It,

where U. - p, - - voltage on condensation - sg

 torus 5,

The third measurement is made at the moment when the capacitor 5, t, e is charged, with ,, t, 10tj. In this case, the input voltage of the recording unit 2 appears

35

U, I (R, + R,),

(3)

In the fourth measurement, the negative current is set at the output of the generator 1 of two-pole current pulses. , - NOR FS: rnity at time t ,.

Capacities of capacitors 13 and 5 are selected 45

„-, t, e, after the full discharge of a conitr Cr MO 7 / rrrstltTTJ .. rx-r-1

5, at the end of the transition npoi ;; ecca in the channel of the communication line 4, t, e. at + r, the input voltage of the recording unit 2 is

The conditions are:

RoC, 3 С, 10С ,,. where rjj is model resistance

resistor 10; With ,, - the capacitance of the capacitor 13; Cj. - capacitor capacitance 5; f is the transition time

on channel 4, the device works as follows,

At time t 0, the current I is set at the output of the generator 1 of double-pole current pulses

U, I (R,), (4) RJ + R J + R

where R is the resistance of the resistive 55 sensor 9,

The establishment of the current at the output of the generator 1 bipolar current pulses at times t ,, t and ty, voltage conversion, described by ps

polarity. At the moment of time

t T at the output of the transformer appears tangible ({d

and, 1 (c.B.V.)., “

(one)

, + R.

R ,, Rj and R, are the resistances of parameters 6,7 and 8 of link 4, respectively; R- - resistance of diodes 11 and 12;

 " -" one /

Itl

with

- the voltage on the capacitor 13, At this moment, a certain voltage also appears on the capacitor 5. However, since the capacitors 13 and 5 are different in order, and the currents flowing through them are the same, the voltage across the capacitor 5 can be neglected,

The second measurement is made at the moment when the capacitor 13 is charged, t, e, at t, 10tj 1006. The input voltage of the recording unit J is determined by the expression

.-I (R, | -: i; i) “,, (2)

It,

where U. - p, - - voltage on condensation - sg

 torus 5,

The third measurement is made at the moment when the capacitor 5, t, e is charged, with ,, t, 10tj. In this case, the input voltage of the recording unit 2 appears

U, I (R, + R,),

(3)

In the fourth measurement, a negative current 50 is set at the output of the generator 1 of double-pole current pulses.

U, I (R,), (4) RJ + R J + R

where R is the resistance of the resistive 55 sensor 9,

The establishment of the current at the output of the generator 1 bipolar current pulses at times t ,, t and ty, voltage conversion, described by ps

31

expressions (1) - (4) in registering unit 2 at times tj, t, t, and tj are effected by control signals generated in control unit 3.

The recording unit 2 determines the resistance of the resistive one. sensor 9 according to the algorithm.

355941

Formulas

the invention

R Ri, (Ni-N) lNi; Ni) (,) (N, -N4)

where N, - N - codes corresponding

voltage U, -U ,, -ig-Dg, and, and 04.

The recording unit 2 is chained up with the voltage-code input converter, the control unit 3 is in the form of a pulse distributor.

A device for measuring the resistance increment of a resistive sensor according to ed. St. No. 974144, characterized in that, in order to increase the accuracy of measuring the resistance increment of a resistive sensor by eliminating the influence of communication line parameters, two capacitors are added to it (5), the first capacitor is connected to the common output with one of its outputs the first and second nonlinear elements are 5 with one-way conductivity, and the second output is with the first output of the communication line, the second output of the communication line is connected to the common point | 1 of the connection of the reference resistor and resistive sensor, and the second capacitor C connected parallel to the exemplary resistor.

355941

Formulas

the invention

Claims (1)

Device for measuring the increment of resistance of a resistive sensor St. No. 974144, characterized in that, in order to increase the accuracy of measuring the increment of the resistance of the resistive sensor by eliminating the influence of parameters of 10 meters of the communication line, two capacitors are additionally introduced into it, the first capacitor connected to the common output of the first and second nonlinear elements with one output one-sided conductivity, and the second output - with the first output of the communication line, the second output of the communication line is connected to a common connection point of a reference resistor and a resistive · 20 sensor, and the second capacitor en parallel to the standard resistor.