![]() ![]() These tests demonstrated the precise accuracy of HOD measurements and the HOD's technological readiness for field deployment for various applications. ![]() In the field tests, the HOD was evaluated against a reference rain gauge in a number of rain events. ![]() In the laboratory tests, high-precision spherical lenses with known diameters and water drops of different sizes generated for a known volume of water were used. The measurement capabilities of the HOD were evaluated through both laboratory and field tests. This innovative operation principle ensures the capture of sharp images of raindrop silhouettes, which are then digitally processed to provide accurate information on various raindrop characteristics. The use of a sensing unit enables the confinement of a measurement volume around the camera focal plane. The high-speed video camera is directed at the LED light to capture the silhouettes of the backlit drops when triggered by a raindrop that is detected within a specified focal depth by the sensing unit. The main components of the HOD are a high-speed video camera, a light-emitting diode (LED) light, and a sensing unit to detect raindrops passing through the camera view frame. A high-speed optical disdrometer (HOD) that was developed for measuring rainfall microphysical quantities, including raindrop shape, size distribution, and fall velocity/acceleration, is the subject of this paper. ![]()
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