Patent ID: 11947072
Assignee: HAINAN ACOUSTICS LABORATORY, INSTITUTE OF ACOUSTICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 6:
7. The automatic trigger and self-calibrated ultrasonic rain measurement system according to claim 6, a specific realization process of the rainfall calculation unit comprising:
according to a distance h between the first self-calibrating ultrasonic probe and the second self-calibrating ultrasonic probe, and the calibrated flight time to, calculating a corrected propagation velocity v of the ultrasonic signal in a current environment, in millimeters per microsecond:

v=h/t0,

according to the measured flight time t1 in microseconds, the distance D from the first measuring ultrasonic probe to the water surface as:

D=v×t1/2,

calculating a vertical distance H from the first measuring ultrasonic probe to the water surface by the following formula:

H=√{square root over (D2−(d/2)2)},

where, d is the distance between the first measuring ultrasonic probe and the second measuring ultrasonic probe;
comparing the vertical distance H from the first measuring ultrasonic probe to the water surface at the current moment and a vertical distance H1 from the first measuring ultrasonic probe to the water surface at the previous time,
if H>H1, the rainfall ΔH is:
ΔH=H−H1,
if H<H1, the rainfall ΔH is:
ΔH=0,
assigned H to H1, where H is the vertical distance from the first measured ultrasonic probe to the water surface obtained at the current moment;
expanding the rainfall ΔH by a fixed multiple to an integer and outputting.