The quality features of old bamboo
Quality characteristics
The shape is wide and flat, and the color is yellow-green or dark green, such as bamboo leaves, with oil black, so it is called "bamboo leaf-iron color." The surface is smooth, the tea soup is greenish, and the aroma is high, while the cooked chestnuts are fragrant, rich and refreshing, and the leaves are yellow and green.
General generous quality features: dark green color appearance like cast iron, bamboo-like shape, known as iron generous, also known as generous bamboo. Generous products are divided into top-ranking and generous and natural products according to their quality.
The narrowband filter is subdivided from the bandpass filter, and its definition is the same as the bandpass filter, that is, this kind of filter allows the optical signal to pass through in a specific wavelength band, but deviates from the outside of this wavelength band. Optical signals on both sides are blocked, and the passband of the narrowband filter is relatively narrow, generally less than 5% of the central wavelength value.
The narrowband filter is subdivided from the bandpass filter, and its definition is the same as the bandpass filter, that is, this kind of filter allows the optical signal to pass through in a specific wavelength band, but deviates from the outside of this wavelength band. Optical signals on both sides are blocked, and the passband of the narrowband filter is relatively narrow, generally less than 5% of the central wavelength value.
Its main parameters are: center wavelength, half maximum width (bandwidth), peak transmittance, cut-off range, cut-off depth (OD value)
Type: Generally, it can be any wavelength within 350nm~2000nm, the transmittance is greater than 70%, the cut-off wavelength is from 200nm to 3500nm, and the cut-off depth is 1OD~6OD
Let the visible light completely filter out only the near-infrared 940nm light that needs to be used, so that the CCD or CMOS photosensitive chip can form a black and white image. Through the calculation method of the biometric system, the human eye, iris, and face are tested to identify different people. Features, play access control security, hotel, entertainment venue monitoring, factory or office attendance.
Bandpass Filter,Optical Bandpass Filter,Nawrrow Bandpass Filter,Uv Nawrrow Bandpass Filter
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