Quarterdeck Volume 5, Number 1, Spring 1997
1. Electronics inside this cylinder process the signal and send it to the CTD, which then transmits it to the surface. As the transmissometer is lowered through the water, a beam of light of a single wavelength is projected from one end. The light passes through this water to the sensor at the other end of the instrument, which continually detects the beam and measures how much light was able to pass through the water. That amount changes as the instrument passes through different layers of water on its way to the seafloor.
2. Electronics inside this cylinder process the signal and send it to the CTD, which then transmits it to the surface.
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