SU1627999A1 - Method for measuring physical quantity - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the measurement accuracy when using measuring devices with a quadratic characteristic. The method consists in carrying out measurements in several cycles: in the first step, the physical quantity x is measured by means of a working measuring device, which is then divided into scaled physical quantities k, x and in the second cycle the value is measured by a working measuring device. Measurement in the first step of the value x by means of an additional measuring device, and in the second step of the value kax by means of an exemplary measuring device and the sum k, x + by means of an additional measuring device and an estimate of the value of the physical quantity according to the formula given in the description of the invention reduces the error associated with a change in the base ratio of the separated components of a physical quantity, 1 sludge. (/)

Description

The invention relates to a measurement technique and can be used as a part of information and measurement channels of an automated process control system for test complexes.

The purpose of the invention is to improve the measurement accuracy when using measuring devices with a quadratic characteristic.

The drawing shows a block diagram of a device for implementing the proposed method.

The device contains keys 1 and 2, the inputs of which are connected to the input of the device, the separating block 3, the adder 4, exemplary, working and additional - nigelny meters 5-7 and the transmitter 8. The output of the key 1 is connected to the first inputs of the adder 4 and meter 6, the key output is the 2nd input of the block 3, the first output of which is connected to the second inputs of the adder 4 and the meter 6, and the second output to the third input of the adder 4 and the input of the meter 5. The output of the adder 4 is connected to the input of the meter 7. The outputs of the meters 5 -7 are connected to the inputs of the calculator 8, the output of which is connected to device output.

0

to

CO CO CO

In the drawing, the following notation is accepted: x is the measured physical quantity; x is the estimate of the value of the measured physical quantity; k, x, and k.x are scaled with coefficients k, and k values of a physical quantity x; y, ur, y — measurement results obtained using an exemplary, working, and auxiliary meter 5-7.

The measurement process consists of two cycles.

In the first cycle, key 1 is closed, and key 2 is open. The measuring meter 6 itself is supplied to the inputs of the working meter 6 and the additional meter 7 itself (the measured value x is fed to the input of meter 7 through adder A, but since the second key 2 is open, the measured value x passes through adder 4 without changing ) As a result, two results of measuring the physical quantity x are formed in the first cycle, namely: measurement of y by means of an additional meter 7 and measurements of y by a working meter.

In the second cycle, key 1 is open, and key 2 is closed. The measured physical quantity x is supplied via key 2 to block 3, where it is divided into two components x and. The first component is fed to the input of the working meter 6, the second component is k, x is fed to the input of the reference meter 5. In addition, the components k, x and are summed up

in adder 4 and the sum k.x + k-x

enters the input of the additional meter 7. As a result, three measurement results are formed on the second cycle, namely: measuring the angle component k, x with a working meter 6, Measuring the sum of k x + kax through the additional meter 7, measuring the component k x by means of an exemplary meter 5.

Due to the fact that the measurement of y ° is made with a high-precision model meter 5, y °, i.e. the error of this measurement can be neglected in comparison with the errors of meters 6 and 7, which have the same accuracy.

When the calibration characteristics of the working and additional measure

and x

lei 6 and 7 of the type of uR-agh and y .., where and a are the sensitivity coefficients

equations, 9 w at

ut - a –x. W - aj (k,

IE

Ug U o

AE (xx kjX,

k, x) 2

Estimation of the value of the measured physical quantity

And x

 - ЈЦ7Г

Claims (1)

Invention Formula The method of measuring physical quantities, which consists in measuring the physical quantity in several cycles with the help of the working and reference meter gx devices, in the first cycle the physical quantity x is measured using the working measuring device, the physical quantity is divided into first and second scaled physical quantities k, x and kx, in the second cycle, by means of a working measuring device, the first scaled physical quantity is measured, characterized in that, in order to increase the accuracy When using measuring devices with a quadratic characteristic, the physical quantity x is measured by an additional measuring device in the first step, the second scaled physical quantity is measured by the second measure using the sample measuring device, the first and ltor / s scaled physical objects are measured and the resulting amount is measured by additional measuring device, and the assessment of the value of a physical quantity is determined by the formula 0 five BUT X R where u I vd / vri | IVP / VP I I Chu2 U, I I I P y - measurement results by means of a working measuring device in the first and second l cycles; y - measurement results through extra 51627999 measuring device in the first and second cycles; measurement result with an exemplary measuring device, with graduation characteristics, respectively, of the working 10 g / x de ag and a but and additional measuring devices have the form y - a9x, coefficient of sensitivity of the working and exemplary measuring devices.