SU1440157A1 - Non-contact method for measuring temperature - Google Patents

Abstract

The invention relates to radiation pyrometry. The invention is an improvement in accuracy. The essence of the invention is the simultaneous correction of pyrometer signals, proportional to the spectral velocities of close wavelengths, until the onset of equality of these signals and the determination of the actual temperature of the object. The invention improves the accuracy of temperature measurement. 1 il.

Description

The invention relates to radiation pyrometry and can be used in metallurgy, instrument making, the glass industry and tod.

The aim of the invention is to improve the accuracy.

The method is as follows. When measuring the temperature T, two signals U and U are formed, which are proportional to the two spectral capacities of the object, which can be represented only in the Wien approximation.

the following equations:

1T - g K i, - t, c ,, K ,,

"G

Ui - c, l | e ek.

(one)

(2)

where C and Cf2 are constant in the equation

Wines of Planck;

 and D effect anachenes of the pyrometer wavelengths (5 and are the spectral, radiating abilities of the object.

  c is the spectral absorption coefficients of the intermediate medium; K and K - coefficients of the front. Chi-electronic path of the pyrometer channels.

These signals determine the temperature of the object TJ ;, and T ,,, and their difference. At 6z

 -) i.e. at

3) IT

 about.

four

four

ABOUT

SP

the difference between the inverse of the two p-bone temperatures can be represented by an equation in the form

- (- (Ta - T

th (

H2

 Ag-

Sp

In (gC) (3)

By increasing the gain in the common channel of the pyrometer (or the same number of times in both channels simultaneously)

measured at the outputs of the channel signals Cr

ui CD, Cr

(BUT)

C, Af e

 n st - -.

(five)

where n is the correction factor, and these signals determine the conditional temperature T

yi y2

 BUT

 t- - (ei} n).

},

 T

Ai

In sleep)

and the difference of these conditional temperatures. By changing the coefficient n, the difference is achieved equal to zero.

one-%

AT (") Oi

and the temperature measured at the same time corresponds to the actual temperature of the object.

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

The device contains successively installed optical circuit 1, obturator 2, two light filters 3, 4, photodetector 5, amplifier 6, logarifmator 7, resistive-key circuits 8, 9, unit 10 for calculating the difference between inverse temperature temperatures, recorder 11, unit negative feedback 12 and gain control 13.

The device works in the same way.

The obturator 2 rotates and with the help of filters 3 and 4 removes two spectral streams from the thermal radiation spectrum of the object, which in the load of the photo-receiver 5 form signals and and are proportional to the indicated spectral streams. Further, these

five

0

five

the signals y (.; |; are leaked, logarithmized and fed through the resistive-key circuits to block 10. A signal proportional to the LT is fed to a feedback unit, which by means of the regulator 13 increases the transmission coefficient in the common channel of the pyrometer optical-electronic path n times before the onset of the zero signal at the output of block 10. After that, the conditional apparent temperature of the object, which is taken as its actual temperature, is measured.

The method can be implemented using a two-channel two-wave pyrometer containing successively included optical circuit with a flow splitter, two photodetectors, two amplifiers, a computing and recording device, as well as a non-selective optical absorber introduced between the optical circuit and the separator and associated with the separator circuit, which in turn is controlled by the computing device. When calibrating on the emitter black absorber. Set to maximum absorption. When measuring the temperature of a real object, if its radiating ability differs from unity, the absorber is derived by its control circuit so that the product n becomes equal to unity.

Claims (1)

Invention Formula A method of contactless temperature measurement, consisting in measuring signals proportional to two spectral frequencies at PHbix wavelengths, determining temperature temperatures, correcting one of the signals by varying the transmission coefficient of this signal, and measuring it at a conventional temperature, characterized in that In order to improve the measurement accuracy, simultaneously at the same time as the first signal, the transmission coefficient of the second signal is changed and the second conventional temperature is measured, and itelnuyu temperature determined at the moment of equality conditioned temperatures. 0 five 0 50 55 Editor O. Yurkova Tehred M. Morgental Proofreader S. Shekmar Order 3939 Circulation Subscription VNIIPI State. Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Z-ZZ, Raushsk nab., D. / 5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101