SU741070A1 - Method of graduating spectral ratio pyrometers - Google Patents

Description

The invention relates to methods for calibrating and calibrating spectrometer pyrometers with a linear temperature scale and can be used for electrical adjustment of the scales of said pyrometers.

Known methods for calibrating spectrometer pyrometers based on the establishment of a unique jq connection between the output signal of the pyrometer AND color temperature, using an exemplary emitter calibrated to the color temperature [1] _and [2].

Of the known methods for calibrating spectrometer pyrometers, the closest in technical essence to the proposed one is the method [3], according to which, using the model temperature emitter, a number of color temperatures are established and, by changing the pyrometer parameters, 25 linear communication between the output signal is obtained by successive approximations pyrometer and set color temperature.

The disadvantage of this method is quite large of Atrato time for grading, as necessary parameters pyrometer installed by successive approximations and calculated way for determining these parameters in this case is not suitable, as would be required to accurately know the value of the effective wavelengths> Qi D _th, as well as spectral sensitivity coefficients and

The purpose of the invention is to reduce the time spent on the calibration of spectrometer pyrometers.

This goal is achieved due to the fact that the values of the output * signals of the Logarithm are recorded, which correspond to the three values of the color temperature from this temperature range, then, based on the obtained values of the output signals of the Logarithm and the corresponding values of color temperatures, the output signal of the pyrometer and color temperature are set, and then set any value of color temperature from a given temperature range and change the transfer coefficient of the scale conversion indicator until the desired output value of the pyrometer is reached.

In pyrometer spectral ratios with a linear temperature scale, the conversion is carried out in accordance with the Wien formula, while the output signal of the pyrometer is

Ή A -''- ⁿ Vi $ from B where k _n is the coefficient of proportionality;

The SC and U _{2 are} the pulse amplitudes proportional to the quasimonochromatic mag- netic intensities of the object's radiation in (A *, T) and in CZYG) at the effective wavelengths λ 4 and Aji, with Ui = 1-Lv (^ m), and ₂ = £ Α · β (Α ₂ , Τ), where K is the transmission coefficient of the optoelectronic channel;

„ ^S · ^c = ⁽ t.4> · where is the second constant in the Planck formula V.

IN].

The functional diagram of the spectrometer spectrometer pyrometer with a linear temperature scale is shown in the drawing.

The pyrometer contains an exemplary temperature lamp 1, a light flux modulator 2, a radiation receiver 3, an amplifier 4, a functional converter 5, in which dependence (1) is implemented, consisting of a logarithm 6, summing device 7, bias source 8, and divider 9 "

The output is a signal that is not added up in the adder 7 with the output signal B of the bias source. At the output of divider 9 is formed magnitude -., -, and the output scale converter - a signal described by equation (1), where k _x = A _h A, where _m - the transfer converter 10 of scale factor.

The purpose of calibrating the pyrometer is to set the parameters B and K _m, respectively, the bias source and the scale converter.

The essence of the calibration method is that you set three values of color temperature

and large-scale pre-logarithm 6

^T 1 = ⁺ cM ^t c- ^t n>' (2) ^T 2 = Τμ + T _u ), (3) 60 ^t e = t _n + <l ₃ (t _k - t _n ), (4) where 0 cL ^ S 1 (1 = 1, 2, 3);

T _m and T _k - color temperatures corresponding to the beginning and end of the temperature range, and determine the corresponding signal values at the output of the logarithm

torus 6 equal (5) FROM. (6) from. (7)

For three temperatures T., T ,, and you can always find a coefficient γ such that

T * - T ₂ = -3- _(T2 "T _e) (8) 'using the expression (1), the formula (8) can be expressed as ^X * H YOU" ^X yh2 ^{x =} ye * ^₃₎ · V}

Substituting expressions (2) - (4) in the formula (8) we find the value of the coefficient

T =

Substituting the values (1) and (10) in (9), and also taking into account relations (5) - (7) _; we get

-k _n A -k _n A. 4. a / 4 _ _ ± 'from where we determine the value of B, which provides a linear connection of the output signal of the pyrometer with the color temperature

B ⁼ ----------- ⁽¹¹⁾

Having determined the desired value of B, set the level of the output signal of the bias source 8, equal to this value. Then, any color temperature value is set (in particular, temperatures T ₄ , T _a or T ₃ ), after which the transfer coefficient K ^ of the scale converter 9 is changed until the required value of the output signal, determined by the equation, is established at the output of the pyrometer (1) .

Claims (3)

1. USSR Author's Certificate No. 158116, cl. G 01 I 5/00, 1963. 2. Kirenkov I. I. Metrological foundations of optical pyrometry. M., ed. Standards, 1976. 3. Lapina E. A. Pyrometers from the study. M., ed. NPO Pribroprom, 1966, p. 68-69 (prototype).