Why can narrowband filters dominate the optical instrument industry

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Date: 2019-10-24Read: 1

　　Narrowband filterIt is widely used in photography creation, printing and plate making, color photography, magnification, and various technological photography. Especially in black and white photography, it can have three functions: passing, limiting, and blocking various colored light rays. The more colored light passes through, the lighter the color tone in the photo; If the amount of light passing is small, the color tone will be dark. If the light is blocked, the tone will be completely black. Therefore, in black and white photography, narrowband filters are actually used to correct the color contrast of objects, making the colors of various objects conform to their own contrast and ideal tone requirements. The function of narrowband filters is only to allow light within a certain wavelength range to pass through, while light of other wavelengths cannot pass through. Various digital and electronic product windows, solar cells, IC packaging, etc. can reduce the effects of stray light or light damage through it. It can measure the surface temperature of stars, perform color separation exposure to eliminate the influence of color difference, reduce the brightness of the sun, moon, Mars, etc. to obtain clearer details, and prevent infrared and ultraviolet exposure to CCD or eye damage, etc.

The quality of the narrowband filter in optical instruments directly affects the sensitivity of the instrument, and the quality of the filter is measured by its wavelength accuracy and peak index. Therefore, the wavelength accuracy and peak value of the filter are important parameters for measuring optical instruments. Although this is not mentioned in the manufacturer's instrument manual, we have found that checking the wavelength accuracy and peak value of the filter is important and necessary in the actual use of the instrument. Through inspection, we can discover the degree of conformity between the wavelength calibration value of the narrowband filter and the measured value, and whether the quality of the filter meets the requirements.

Small details to pay attention to during the normal use of narrowband filters:

1. During normal use, it is advisable to be as careful as possible when taking and placing the filter, while also paying attention to the external environment to avoid scratching the filter with clothing zippers, buttons, etc., or placing the filter in a dirty or dusty environment.

2. When touching the filter, wear finger cots to avoid salt and acidic substances from corroding the surface of the substrate.

3. When taking out the filter, hold the edge of the filter with your hand, and even with a finger cots, do not touch the transparent surface of the filter.

4. The filter should be placed on a soft and clean object, not on glass, metal, a table, or unclean paper.

In addition, narrowband filters have a wide range of applications in digital imaging (digital cameras, digital video recorders, surveillance cameras, computer cameras, mobile phone cameras, electronic toys, etc.), infrared detectors, medical device lasers, LED liquid crystal displays, induction recognition systems, stage lighting color chips, decorative films, waterproof protective films, etc.

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