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Filters - Questions
What is meant by integrated blocking? Integrated blocking is a more useful way to define blocking. It is the ratio of the total radiation (energy) outside the passband to the total radiation within the passband. Integrated blocking is also influenced by the source output and detector response as functions of wavelength.

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What is absolute blocking? Blocking is sometimes defined in absolute terms which refers to the ratio of the largest peak outside the passband to the peak within the passband. Absolute blocking does not measure the total radiation (energy) outside the passband and has little meaning in spectroscopy, where all radiation outside the passband is considered stray light.

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What is meant by halfbandwidth? The wavelength interval of the passband measured at the half power points (50% of peak transmittance). It is often expressed as halfbandwidth (HBW), full width half maximum (FWHM) or half power bandwidth (HPBW).

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What is ND versus OD? ND means neutral density and describes a type of component that is used to attenuate transmission across a wide band. OD, or optical density, is the measurement of the ratio of total transmitted light to total background light.

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How do you convert from OD to transmission? OD, or optical density, is equal to the logarithm of 1/T.

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What are OEM custom size capabilities? For OEM customers, non-standard sizes can range from 0.375" up to 4.0".

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What are custom halfbandwidth capabilities? While our standard filters are generally produced in 10 nm and 80 nm half bandwidth (HBW) configurations, custom HBW capabilities range from 2 80 nm for OEM customers.

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What is clear aperture? The central, useable area of a filter through which radiation can be transmitted.

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