Non-contact temperature measurement method, point temperature instrument and application thereof

Abstract

The invention indicates inaccuracy of the blackbody radiation law for non-contact temperature measurement, and provides a novel temperature measurement and metering method and a corresponding point temperature instrument, and an original novelty of standardization and scale graduation of a thermodetector. With the development of novel elements and a digitalization technology, the wavelength and the frequency of a measured point are changed due to the change of the temperature of the point; and the change values of the wavelength and the frequency are replaced by wave numbers, so an aim of measuring the temperature of a temperature source can be fulfilled by measuring the wave number of the temperature source in a mutual relation that the temperature becomes higher and the wave numbers become larger. As the wave number is a digital value in which the energy is distributed uniformly, the temperature can be measured precisely by metering the size of the wave number. By four formulas expressed in the invention, a quantitative relation between the heat energy and the wave energy of one point is defined, so a design of the thermodetector, selection of elements, programming of software and inspection of products can be instructed.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement, and in particular relates to a non-contact temperature measurement method, a spot thermometer adopting the method and its application, which are used to replace existing non-contact thermometers and non-contact thermometers on the market. Temperature sensor system to improve measurement accuracy. Background technique [0002] In the contact temperature measurement method, it has been recognized internationally that the temperature measured by platinum resistance (-200°C ~ +900°C) and platinum-rhodium thermocouple (300°C ~ 1450°C) is accurate and can be used as a contact measurement method. The temperature etalon, because it has the characteristic of measuring the temperature of a point and has nothing to do with the surface material touching the point, has high accuracy under the condition of slowly changing temperature or static state. However, due to the incompetence of platinu...

AI Technical Summary

Problems solved by technology

Through years of practice and research, we have shown that there are two problems with this law: first, the thermocouple endpoints are two metal wire nodes of different materials that are heated to generate electromotive force, which we call the thermoelectric effect, not the photoelectric effect, but according to the blackbody radiation Law, the black body radiation wave is a kind of light wave, which heats the thermocouple. In fact, the light wave is converted into electric current, and the conversion element with photoelectric effect must have the maximum efficiency; the second problem: as we all know, the thermocouple only contacts the measured object. The correct temperature value, like Planck's experimental device, is neither contact nor embedded, and the energy of the center of the sphere where the thermocouple is placed in the thermal field space cannot accurately represent the energy of the inner sphere

Even if later generations adopt advanced sensor optical fibers and advanced photoelectric conversion elements, as long as the black body radiation is used as the standard, and the non-black body adopts the method of adjusting the emissivity coefficient to compensate the temperature, what is also obtained is a stable and incorrect temperature, because its signal The receiving and processing method cannot meet the requirements of the real temperature, especially the radiation coefficient is related to the difference in the composition of the same material, the surface roughness of the material, and the color difference. The dual-wavelength comparison method can compensate for the error caused by the distance change, but The distance is mixed with factors such as the radiation coefficient and the target area providing information, and there is no fixed relationship

Therefore, the non-contact thermometers that already exist on the market based on Planck's black body radiation law can't actually measure the temperature correctly.

Images