Specifications To Check Before You Buy Band Pass Filter.

You should look for the following specifications before purchasing a Band Pass Filter:

1. The maximum transmission of the filter is known as transmission (%).
2. The midpoint of the transmission region is known as the central wavelength (CWL) (nm).
3. The width of the transmission zone at half the transmission maximum value is described by the full width half maximum (FWHM) (nm).
4. The mechanics of thin-film interference filters cause FWHM to typically increase with wavelength. It is possible to calculate it as a fraction of the central wavelength.
5. Instead of FWHM and CWL, cut-off and cut-off wavelengths can indicate the limits of the filter's transmission zone (nm).
6. The passband ripple (%) reflects how flat the transmission zone is. Older designs and some narrow bandpass filters have a peaked passband shape rather than a flat top. Flat-top designs generally require more layers and cost more money.

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