Vaisala FD70 Forward Scatter Sensor series
|SeaVoX Device Catalogue
|Vaisala FD70 series
|A series of forward scatter sensors designed for precipitation type identification, plus intensity and accumulation quantification. They also measure droplet size distributions and reflectivity. The series includes the FD70, FD71 Visibility sensor and the FD71P Visibility and Present Weather sensor. The FD71P incorporates a Vaisala HMP155 HUMICAP probe, which measures the humidity and temperature of ambient air. A near infra-red light source is transmitted and optically transformed into a thin light sheet. The receiver measures the forward scattered light at an angle of 42 degrees and evaluates every precipitation particle with respect to signal strength and time to determine particle size, shape, and fall speed. The look-down geometry and hood heating protect the sensor windows against external disturbances. The FD70 series complies with ICAO, FAA, and WMO requirements and uses WMO and NWS weather codes in reporting. It has a visibility up to 100 k and an optimal forward scattering angle of 42 degrees. It has a 5 MHz sampling frequency and 5 s measuring cycle.
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