Description
- Filter: It is an optical device used to select the required radiation band. One of the common characteristics of filters is that there is no filter to make the image of celestial bodies brighter, because all filters absorb certain wavelengths, which makes the object darker. Optical filters are very useful and are widely used in photography
- Optical Filter Pass 400nm-700nm Light Band Bandpass Filter
- The filter is made of plastic or glass with special dyes. The red filter can only let red light pass through, and so on.
- The refractive index of the glass sheet is originally similar to that of air, so the colored light can pass through, so it is transparent, but after dyeing the dye, the molecular structure changes and the refractive index also changes, and the passage of some colored light changes, such as A beam of white light passes through the blue filter and emits a beam of blue light, while green light and red light are very few, and most of them are absorbed by the filter.
- Visible light is highly transparent and invisible light cut-off filter. Can be widely used in: barcode scanners, laser rangefinders, fingerprint identification devices, laser power meters, red light LD laser pumping and other fields.