SU1732189A1 - Temperature determining method - Google Patents

Abstract

Using remote temperature measurement The essence of the invention: monochromatic radiation excites the luminescence of the sample in the anti-Stokes region. At the same time, the integral luminescence intensity and the intensity of the radiation scattered by the sample are recorded. According to the magnitude of the ratio of these intensities, the temperature of the object is determined, in thermal contact with which a sample is installed, 2 or 3

Description

The invention relates to thermometry and can be used in various fields of science and technology for remote temperature measurement.

A known method for measuring the temperature of an object with respect to the successively measured intensities of the radiation line of a thermosensitive material brought into contact with the object of measurement and irradiated alternately with light with one and another wavelength. The luminescence intensity varies in proportion to the temperature when excited with light of the first wavelength and inversely proportional to the temperature when excited with light of a different wavelength. The intensity of the indicated luminescence line is measured during successive periods of illumination by the first and second beams, the ratio of the successively measured intensities is calculated i

and judged by it the temperature of the object.

An increase in the luminescence intensity with temperature when a sample is excited with light of a certain wavelength is similar to the pattern of changes in the luminescence intensity during anti-Stokes excitation, but the procedure for selecting a substance and exciting light with suitable wavelengths is not specified in the method.

The property of the temperature dependence of the luminescence intensity of a sample under anti-Stokes excitation, which can be used to measure temperature, is known.

The disadvantage of the method of measuring temperature based on the use of this property is the effect on the measurement result of unstable measurement.

but

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tei optical path. Changes in the environment, leading to changes in the emitters of the body's ability and absorption of the intermediate medium, can introduce significant errors in the measurement results.

The aim of the invention is to improve the accuracy by eliminating the influence on the measurement result of an unstable optical path.

This goal is achieved in that according to the method of measuring the temperature of an object, consisting in recording the radiation intensity of a luminescent sample under anti-Stokes excitation, simultaneously recorded at the frequency of the exciting radiation and the intensity of the radiation scattered by the sample, and the desired temperature is determined by scattered radiation

Increased accuracy is achieved by eliminating the effect on the measurement result of optical path instabilities, which is important when using the proposal for remote temperature measurement,

Fig. 1 shows the experimental setup for the laser excitation of the luminescence of a sample, the measurement of its integrated intensity and the intensity of radiation at the frequency of the exciting light scattered by the sample; Fig 2 - temperature dependences „

The following notation is taken: luminescent sample 1, temperature measurement object 2, luminescence excitation source 3, 1AUM — integrated luminescence intensity of the sample, I & - radiation detectors; in - the frequency of light that excites luminescence.

Fig. 2 shows the temperature dependences of the ratio of the integral luminescence intensity of the uranyl compound DO Cl-DipH to the intensity of radiation at the frequency of the exciting light scattered by the sample, with two values of the frequency 3 $: curve I was obtained for 19436 curve II - Hz 19201,

For convenience of image (Curve intensity ratio values are given on a logarithmic scale

,

7321894

The method is carried out as follows.

A uranyl compound is taken as the luminescent sample.

ten

(five

20

25

thirty

40

4S

DipH2 (the frequency of the purely electronic transition in the luminescence spectrum of this compound is 19754). A tablet of this substance is pressed with a CZF press (force of 4 tons). The pressed tablet is brought into thermal contact with the object of measurement and placed in front of the radiation detector (D). The sample is irradiated with light of an argon laser, A-120 frequency} in 19436 ). An LS-11 light filter {thickness 5 mm) is placed between the sample and the detector. The OC-11 filter has a spectral transmittance curve, which excludes the exciting laser line itself from the integrated luminescence of the sample under anti-Stokes selective excitation. The integral luminescence intensity of the sample is 1LUAL 9.23 rel, unit 0 at the same time the DSIF 510 interference filter (Carl Zeiss Jena) is recorded at the frequency of the exciting light by the intensity of the radiation scattered by the sample, IpQC 21.4 relative0 The filter bandwidth 10 nm Calculate

T-Afi # 0,43 and by calibration xpqc

The curve 35 determines the temperature of the object T 304 + 4 K.

As detectors D ,, and D 2 use FEU-36 with a digital voltmeter- {r o

Registration of the intensity of scattered radiation simultaneously with the intensity of anti-Stokes luminescence and the determination of temperature by their ratio eliminate the effect on the measurement result of the instabilities of the optical path and thereby increase the measurement accuracy in determining the temperature.

Claims (1)

Invention Formula The method of determining the temperature, in which monochromatic radiation excites luminescence in the anti-Stokes region of the sample that is in thermal contact with the object, and the integral luminescence intensity is recorded, 51732189 that, in order to increase the accuracy, the single temperature is determined at a time by registering at the frequency of the ratio of the integral in- tainting radiation the intensity of the luminescence intensity to the intensity of the radiation scattered by the sample, and the intensity of the scattered radiation. FIG. one & n Ipot w -S -to but 100 too and