ISO/TC 211 Multi-Lingual Glossary of Terms (MLGT)

Note 1 to entry: The range of desired wavelengths/frequencies to be passed by an optical filter is called the "bandpass". This is generally defined by the cut-on and cut-off wavelengths/frequencies of the optical filter.

Note 2 to entry: The EO sensor response to the optical wavelengths/frequencies within the desired optical filter bandpass is called the "in-band response".

Note 3 to entry: The ability of an optical filter (or optical system) to reject optical energy outside the desired wavelengths/frequencies is referred to as "out-of-band (OOB) blocking". This can also refer to filter design specifications regarding the ability to reject optical energy outside the desired filter bandpass.

Note 4 to entry: Undesired optical energy that passes through an optical filter (or optical system) that has a spectral location outside the desired spectral bandpass is called " OOB leakage".

Note 5 to entry: An EO sensor's response to OOB leakage is called the "OOB response".

Note 6 to entry: The ratio of the open-path throughput of an optical path with and without the filter is called transmittance". Generally expressed as a function of wavelength or optical frequency, transmittance values range from 0 to 1, or 0 % to 100 % if expressed in percent transmittance.

Note 7 to entry: This entry is adapted from Reference [12].