Natural light is composed of light waves with different wavelengths. The visible range of the human eye is roughly 390-780nm. The electromagnetic wave shorter than 390nm and the electromagnetic wave longer than 780nm cannot be felt by the human eye. Among them, the electromagnetic waves with wavelengths less than 390nm are located outside the violet of the visible light spectrum and are called ultraviolet rays; the electromagnetic waves longer than 780nm are located outside the red of the visible light spectrum and are called infrared rays, and their wavelengths are from 780nm to 1mm.
The thermal imaging lenses technology uses a micro thermal radiation detector, an optical thermal imaging lenses and an optical-mechanical scanning system to receive the infrared radiation signal of the measured target. On the element, that is, the infrared thermal image of the object to be measured is scanned and focused on the unit or spectroscopic detector. The infrared radiation energy is converted into electrical signals by the detectors, and then converted into standard video signals through a TV screen or monitor. Displays an infrared thermal image.