Explanation of ultraviolet photography terms

Ultraviolet photography, with ultraviolet light as the light source, adopts a special timely glass lens with an ultraviolet filter in front.

The recorded spectral region is in the range of 120-380 nm. Ordinary photographic film or dry plate can be used for photographing in the mid-ultraviolet region with the wavelength of 20-380 nm, while special B photosensitive material with gelatin content less than 0. 1% is needed for photographing in the region with the wavelength shorter than 200 nm.

When shooting, use a special timely glass lens, stick an ultraviolet filter in front of the lens to prevent visible light from interfering with ultraviolet images, or directly irradiate the subject with ultraviolet light to expose the photosensitive film, and then get a positive film after processing. This photography method is often used in medicine, archaeology, bacteriology research and judicial expertise.

At the shorter wavelength than UV-A, the sensitivity of common camera sensor will decrease rapidly with the decrease of wavelength. This is the result of many factors, the most important of which may be the absorption of Bayer color filter and microlens built in the top of sensor chip. Depending on its thickness and composition, the glass window covering the chip and sealing it in a ceramic package may hinder the transmission of UV-B and UV-C, but it is usually very transparent to UV-A. ..