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

Claim 3:
4. The automatic trigger and self-calibrated ultrasonic rain measurement system according to claim 1, wherein the rainfall measurement unit further includes an impedance conversion driving circuit, a limiting circuit and a signal processing circuit, wherein
the impedance conversion driving circuit is configured to receive the pulse signal, and send the pulse signal to the first measuring ultrasonic probe after amplification and impedance matching;
the limiting circuit is configured to limit an amplitude of the calibration echo signal received by the second measuring ultrasonic probe to obtain an amplitude-limited measurement echo signal and input the amplitude-limited measurement echo signal into the signal processing circuit;
the signal processing circuit is configured to filter and shape the amplitude-limited measurement echo signal in sequence, and send the amplitude-limited measurement echo signal to the channel selection unit.