Optical Windows: the protective barriers for electronic sensors from the outside environment

An Optical window is a transparent, flat substratum which is primarily designed to isolate optical systems against negative influences from the environment. Optical windows are utilized to maximize the transmission in a specified wavelength range and minimize reflection and absorption. To be more precise, the Optical Window is the region of the electromagnetic spectrum that permits visible wavelengths to pass. The optical window is also termed as the visible window as it overlays the human visible response spectrum. These are either parallel or wedged. The former one is used to minimize the distortion of a transmitted beam of light of a specific wavelength, while the latter one is used to direct light at a specific angle and lessen the reflection.

Optical windows are made of a variety of substrates as they are designed to work in different areas of the UV-VIS-IR spectrum. The selection of substrate is based on several factors namely index of refraction, materials transmission, thermal expansion, hardness, and chemical resistance.

An IR window or infrared window is an optic that allows infrared inspections of electrical components situated inside the electrical switchgear enclosures. These windows comprise a metal or plastic frame which holds an infrared transmissive optic. IR window is basically a data collection point installed in the electrical switchgear’s metal cover. It comprises of a lens, a backing ring and the front ring with a cover which secures the opening. The properties of an ideal IR window include high transmittance, low emittance, and low reflectance.

Also, it is should permit the infrared radiation to traverse with zero loss. There are different types of infrared windows available in the market such as viewing panes, inspection grills, inspection ports, etc.

UV Windows are another optical windows devised primarily for optical performance in the ultraviolet or UV spectrums. In many laser applications, UV windows are used in multiple anti-reflection coating options. UV windows entail various benefits as they reflect infrared radiation owing to this they prevent heat gain in summers and heat loss in the winter season. These windows also provide an extra layer of insulation.