Working Principle of Handheld Infrared Thermometers
The temperature measurement of handheld infrared thermometers is theoretically based on Planck's Radiation Law. By measuring the infrared radiation energy of the measured target and performing blackbody calibration, the surface temperature of the target can be accurately determined.
Infrared thermometers feature non-contact measurement, fast response speed, and no disturbance to the temperature distribution field of the measured object. They deliver unique advantages for temperature detection of objects that cannot be measured by contact methods, moving targets, and objects with rapid temperature changes. As a new measurement method for the development of modern temperature measurement technology, infrared thermometers offer outstanding advantages in convenience, efficiency and safety compared with traditional temperature measuring equipment.
All objects with a temperature above absolute zero continuously emit infrared radiation energy into the surrounding space. The magnitude of an object's infrared radiation energy and its wavelength distribution are closely correlated with its surface temperature. Therefore, accurate surface temperature can be obtained by measuring the infrared energy radiated by the object itself, which forms the objective basis of infrared radiation thermometry.
An infrared thermometer consists of an optical system, photoelectric detector, signal amplifier, signal processing unit, display output module and other components. The optical system collects infrared radiation energy from the target within its field of view, whose range is determined by the optical components and structural layout of the thermometer. The focused infrared energy is converted into corresponding electrical signals by the photoelectric detector. After being processed by the amplifier and signal processing circuit, and corrected in accordance with the built-in algorithm and target emissivity parameters of the instrument, the signals are finally converted into the temperature value of the measured target.
