Mõõtevahendid on tavaliselt disainitud piiratud optilise ribalaiusega valgusallikatega ja/või täiendavate filtrielementidega, et veelgi piirata optilist mõõteribalaiust.
Instruments are normally constructed with light sources with a limited optical bandwigth and/or with additional filter elements to further limit the measurement optical bandwidth.
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