From: Quarterdeck Volume 5, Number 1, Spring 1997

Transmissometer

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1. As the transmissometer is lowered through the water, a beam of light of a single wavelength is projected from the electronics in this pressure case. The light passes through the water to a light sensor in a pressure case at the other end of the instrument (2).

2.The amount of light received by this sensor changes as the instrument passes through layers of water with different amounts of particles. The sensor then quantifies the information and sends it back to the first pressure case.

 

3.The electronics inside this pressure case then process the signal and send it to the CTD, which then transmits it to the surface.

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