Infrared thermal imaging camera is a device that converts infrared radiation on the surface of an object into a visible image through an infrared optical system, infrared detector and electronic processing system. It has a temperature measurement function, has the characteristics of quantitatively plotting the temperature distribution on the surface of an object, and performs pseudo-color coding on grayscale images. Products generally include visible light lenses and infrared thermal imaging lenses.
The thermal imager uses an infrared detector and an optical imaging objective to receive the infrared radiation energy distribution pattern of the measured target and reflect it onto the photosensitive element of the infrared detector, thereby obtaining an infrared thermal image. This thermal image The graph corresponds to the heat distribution field on the surface of the object. In layman's terms, a thermal imaging camera converts the invisible infrared energy emitted by an object into a visible thermal image. The different colors on the thermal image represent different temperatures of the object being measured.
The explosion-proof treatment for this type of products is generally made into explosion-proof type. That is, the metal shell and transparent parts that comply with GB3836.1 and GB3836.2 are used to form the product's shell. The cables are connected to the internal terminal blocks through explosion-proof lead-in devices. Confines the energy of the explosion inside the enclosure and prevents flames from traveling from the inside to areas outside where hazardous gases are present.
However, due to the particularity of infrared, germanium glass is generally installed on infrared thermal imaging cameras as the window of the instrument to protect subsequent optical systems and infrared detection devices. However, since the refractive index of germanium material is 4, direct use will cause a large loss of the incident signal. In order to improve the transmission capability of infrared signals, a suitable film needs to be coated on the germanium glass to increase the transmittance and protect the surface of the germanium lens.
The physical properties of germanium glass are relatively brittle, that is, their resistance to mechanical impact is not high. In the explosion-proof treatment method, the germanium glass must be glued to the metal shell as part of the shell. Therefore, germanium glass is required to withstand at least 4J of impact without damage, but it is difficult to achieve this in practice. So we can try to make the germanium glass smaller and thicker, and add a metal mesh outside to reduce the impact. Following the regulations in GB3836.1, for transparent parts protected by a mesh outside, the impact resistance test can be reduced to 2J. The processing of other parts can be carried out according to the standard requirements.