The term transmissometer is also used by oceanographers and limnologists to refer to a device for measuring the optical properties of natural water.
2.
As a complex system, VPR can also carry several oceanographic sensors in the same time such as, CTD, transmissometer, fluorometer and flowmeter.
3.
In this context, a transmissometer measures the transmittance or attenuation of incident radiation from a light source with a select wavelength, often 660 nm, through a defined cell volume.
4.
According to the US Federal Aviation Administration : " There are approximately 279 RVR systems in the NAS, of which 242 are forward scatter NG RVR Systems and 34 are older Transmissometer Systems ."
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