What Do Transmissometer Measure?

The beam transmissometer measures the fraction of light, from a collimated light source, reaching a light detector a set distance away. Light which is absorbed or scattered by the media (usually water) between the source and the detector does not reach the detector.

What is the purpose of a transmissometer?

Transmissometers are optical instruments that measure the clarity of water by measuring the fraction of light energy lost from a collimated light beam as it passes along a known pathlength.

What instrument measures visibility?

At present, the instruments used to measure visibility can be categorized into two types: forward scatter meters and atmospheric transmission meters(Zeng, 1999).