Rainfall Intensity Sensor.
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
An instrument having a logarithmic response is provided which continuously measures rates of rainfall over a range of from 0.3 to 350 mmhr by determining the electrical power required to evaporate the water as it arrives on an exposed sensor. The sensor determines the flux of rain or cloud water arriving on its surface and consists essentially of a porous, water absorbent, dielectric material held between two metallic electrodes across which a fixed electrical potential is maintained. The water is evaporated by electrical heating as it arrives on the surface, and the amount of power required is a measure of the mass flux of water to the collecting surface. Author