RU2421695C2 - Method for noncontact measurement of thermal characteristics of moving object - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: method for noncontact measurement of thermal characteristics of a moving object involves optical reception of the thermal radiation signal of the object, spectral decomposition of the signal and formation of an image of the radiation spectrum on the surface of an array of receivers whose output signals are processed by a processor module. Processing with the processor involves object parameter type invariant approximation of approximation signals of the data base of each object parameter, selection of the most accurate approximant and outputting the corresponding parameter value and error in determining said value.

EFFECT: increase in number of measured parameters and high accuracy of measuring thermal characteristics.

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Description

The invention relates to the field of non-contact measurement of thermal data of a moving object and can be used in measurement technology, metrology, remote sensing.

A device for non-contact temperature measurement (A.S. 1803747, IPC5 G01J 5/60, 1987), comprising an optical system, a radiation receiver, a differentiator, two amplitude detectors, an optical local oscillator, a tunable optical modulator, a device for mixing optical beams, a resonant amplifier and division block.

Known spectral pyrometer (patent US 4605314, IPC4 G01J 5/24, 1986), consisting of an electrical module and an optical module that contains a transmitting unit, a spectral decomposition unit and a detector unit.

The disadvantages of the known devices are the limited number of measured parameters of the object (temperature only) and the dependence of the measurements on the angle of direction to a moving radiation source, since when changing this angle, the position of the image of the radiation spectrum on the surface of the radiation spectrum detector changes.

Closest to the proposed solution is a method implemented in a device for non-contact measurement of the temperature of a moving object (patent RU 2213942, IPC7 G01J 5/60, 2003), which consists in optical reception of the signal of thermal radiation of the object, spectral decomposition of the signal, image formation of the radiation spectrum on the surface of the matrix of receivers, the signals from the outputs of which are processed by a processor unit configured to search for the maximum value of the output signal of the receiver from the matrix of receivers, Stu determining the maximum value of the derivative of output signals from the matrix of receivers and receivers to calculate relative temperature maximum value of the derivative of the output signals from the matrix of receivers to the maximum value of the output signal of the receiver array of receivers.

The disadvantage of this method is the limited number of measured parameters of a moving object (temperature only) and the accuracy of measurements (since during processing, the energy of only one receiver that generated the maximum signal is used to determine the maximum signal value from the receiver matrix).

The objective of the invention is to increase the number of measured parameters of a moving object and the accuracy of measurement of parameters.

The solution to the problem is achieved by the fact that in the method of non-contact measurement of thermal data of a moving object, which consists in optical reception of the signal of thermal radiation of the object, spectral decomposition of the signal, forming an image of the radiation spectrum on the surface of the matrix of receivers, the signals from the outputs of which are processed by the processor unit, processor processing is introduced, consisting of invariant to the type of the object parameter, approximation of the receiver matrix signals by the approximants of the data bank of each object parameter, the choice f for each parameter of the object of the most accurate approximation and the derivation of the corresponding parameter value and the error of its determination.

The technical result consists in increasing the number of measured parameters of a moving object by introducing processor processing that is invariant to the type of parameter and the accuracy of parameter measurements by using the energy of all receivers in the receiver matrix for processor processing.

The method can be implemented in accordance with the structural diagram shown in figure 1, and the technical design is illustrated in figure 2.

The block diagram contains an optical system 1, a spectral decomposition unit 2, a receiver array 3, a processor unit 4, and data banks 5 of these parameters.

The method of non-contact measurement of thermal data of a moving object is implemented as follows. From the radiation source 6, the thermal signal enters through the optical system 1 to the spectral decomposition unit 2, which forms the image of the radiation spectrum on the surface of the matrix of 3 receivers, the signals from the outputs of which are processed by the processor unit 4, and the processor processing consists in the form of the parameter approximation of the matrix signal approximation object 3 receivers by approximants stored in banks of 5 data of each parameter of the object, choosing the most accurate approximation for each parameter of the object and outputting the corresponding the corresponding values of the parameter Pi and the errors of its determination δPi.

For example, for the parameter “object temperature”, the approximants of which are stored, for example, in digital form as a set of Planck functions for various temperatures in the data bank 5 of the 1st parameter “object temperature”, the processor processing consists in choosing the Planck function that most accurately approximates signals of the matrix of 3 receivers and the output of the temperature T corresponding to this function and approximation errors δT.

For the parameter “material of the object”, the approximants of which are stored, for example, in digital form in the form of many functions of the dependence of the emissivity of the material (Fe, Ni, Co, etc.) on the radiation wavelength [1, p. 104, Fig. 60] for of different materials in the data bank 5 of the 2nd parameter “object material”, the processor processing consists in selecting the corresponding function that most accurately approximates the signals of the receiver matrix 3 and deriving the material name corresponding to this function, for example, “Fe”, and the approximation error when using ex same processor algorithms as in the previous example.

When the mutual movement of the radiation source 6 and the measuring system, the measurement results, as well as in the prototype, do not change.

The elements of the device can be made of well-known modules and on an elemental base used in measurement technology and metrology. Constructive execution of blocks 1 ... 4 may coincide with similar blocks of the prototype. The design of the memory unit 5 is obvious from the prior art. Typical processor processing software.

Literature

1. Bramson M.A. Infrared radiation of heated bodies. - M .: Nauka, 1964 .-- 224 p.

Claims (1)

The method of non-contact measurement of thermal data of a moving object, which consists in optical reception of the thermal radiation signal of the object, spectral decomposition of the signal, imaging of the radiation spectrum on the surface of the matrix of receivers, the signals from the outputs of which are processed by the processor unit, characterized in that the processor processing is parameter-invariant of the object of approximating the signals of the matrix of receivers by the approximants of the data bank of each parameter of the object, choosing for each parameter the object of the most accurate approximation and the derivation of the corresponding parameter value and the error of its determination.

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