Analysis on the modern application of infrared thermometer technology
Infrared thermometer by the optical system, photodetector, signal amplifier and signal processing, display output and other components. Optical system convergence of its field of view of the target infrared radiation energy, the size of the field of view by the thermometer's optical parts and their location to determine. The infrared energy is focused on the photodetector and transformed into a corresponding electrical signal. This signal is converted into a temperature value of the target after passing through amplifiers and signal processing circuits and being corrected for the target emissivity according to the algorithm of the instrument's internal therapy.
In nature, all objects with temperatures above absolute zero are constantly emitting infrared radiation energy into the surrounding space. The size of the object's infrared radiation energy and its distribution by wavelength has a very close relationship with its surface temperature. Therefore, through the measurement of the infrared energy radiated by the object itself, it will be able to accurately determine its surface temperature, which is the objective basis for infrared radiation temperature measurement.
Blackbody is an idealized radiator, which absorbs all wavelengths of radiant energy, no energy reflection and transmission, its surface emissivity of 1 ． However, the existence of actual objects in nature, almost all are not a blackbody, in order to clarify and obtain the distribution of infrared radiation law, in the theoretical study must choose the appropriate model, which is Planck put forward by the body cavity radiation quantization vibronic model, which led to Planck's law of the blackbody radiation, that is, the wavelength of the blackbody spectral radiance, this is all the infrared radiation theory of the point of departure, it is called Blackbody radiation This is the starting point for all theories of infrared radiation, so it is called the law of blackbody radiation. All the actual object radiation in addition to relying on the wavelength of radiation and the temperature of the object, but also with the composition of the object's material type, preparation methods, thermal processes, as well as the surface state and environmental conditions and other factors.
Infrared temperature measurement uses a point-by-point analysis, in which the thermal radiation from a localized region of an object is focused on a single detector and the radiant power is converted to temperature by the known emissivity of the object. Due to the object to be detected, the measurement range and the use of different occasions, infrared thermometer appearance design and internal structure is not the same, but the basic structure is largely similar, mainly including optical systems, photodetectors, signal amplifiers and signal processing, display output and other components. Infrared radiation emitted by the radiator. Into the optical system, the modulator to modulate the infrared radiation turnover radiation, by the detector into the corresponding electrical signal. The signal through the amplifier and signal processing circuits, and in accordance with the algorithm within the instrument and the target emissivity corrected into the temperature value of the target to be measured.
Simple operation, easy to use: infrared thermometer should be intuitive, simple operation, easy to be used by the operator, which portable infrared thermometer is a set of temperature measurement and display output as one of the small, lightweight, carried by the person to carry the instrument for temperature measurement in the display panel can display the temperature and the output of a variety of temperature information, and some can be operated remotely or through the computer software program.
In the case of harsh and complex environmental conditions, a system with separate temperature measurement heads and displays can be selected for ease of installation and configuration. Signal output forms can be selected to match current control equipment. Calibration of infrared radiation pyrometer: The infrared pyrometer must be calibrated in order for it to correctly display the temperature of the target to be measured. If the pyrometer used is in use and the temperature measurement is out of specification, it will need to be returned to the manufacturer or maintenance center for re-calibration.
