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

Claim 2:
3. The automatic trigger and self-calibrated ultrasonic rain measurement system according to claim 1, wherein the automatic calibration 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 self-calibrating 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 self-calibrating ultrasonic probe to obtain an amplitude-limited calibration echo signal and input the amplitude-limited calibration echo signal into the signal processing circuit;
the signal processing circuit is configured to filter and shape the amplitude-limited calibration echo signal in sequence, and send the amplitude-limited calibration echo signal to the channel selection unit.