Valguseläbilaskvusmõõtur töötab, saates läbi levikeskkonna kitsa, kollimeeritud energiakiire (tavaliselt laserikiire) ja kitsa vaateväljaga vastuvõttur määratud mõõtekaugusel mõõdab, kui palju energiat jõuab detektorisse, ja arvutab levitee kustumisteguri.
Transmissometer operates by sending a narrow, collimated beam of energy (usually a laser) through the propagation medium. A narrow field of view receiver at the designated measurement distance determines how much energy is arriving at the detector, and determines the path transmission and/or extinction coefficient.
In a transmissiometer the extinction coefficient is determined by measuring direct light transmissivity, and the extinction coefficient is then used to calculate visibility range.
