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

Claim 0:
1. An automatic trigger and self-calibrated ultrasonic rain measurement system, comprising: a rainfall monitoring module, a self-calibration and rainfall measurement module, a central processing module, a water level monitoring module, and a drainage module; wherein
the rainfall monitoring module is configured to monitor rainfall and send a rainfall signal to the central processing module;
the self-calibration and rainfall measurement module is configured to transmit ultrasonic signals and receive calibration echo signals to perform speed self-calibration under a control of the central processing module, and obtain a calibrated flight time and send the calibrated flight time to the central processing module, and the self-calibration and rainfall measurement module is also configured to transmit the ultrasonic signals to a water surface in a bucket under the control of the central processing module and receive a measurement echo signal reflected by the water surface for rainfall measurement, obtain a measured flight time and send the measured flight time to the central processing module;
the central processing module is configured to receive the rainfall signal to start the water level monitoring module and to control an operation of the self-calibration and rainfall measurement module, to receive a self-calibration flight time and the measured flight time, calculate a rainfall value and output the rainfall value in a fixed format;
the water level monitoring module is configured to monitor a water level in the bucket, and send a drainage signal to the drainage module if the water level exceeds a predetermined height or the water level remains unchanged for a predetermined time;
the drainage module is configured to open a drainage and empty water from the bucket after received a drainage signal,
wherein the self-calibration and rainfall measurement module includes a time measurement unit, a channel selection unit, an automatic calibration unit and a rainfall measurement unit; wherein

the time measurement unit is configured to generate a pulse signal of a specific frequency under the control of the central processing module and send the pulse signal to the channel selection unit, and calculate the calibrated flight time to according to the calibration echo signal and send the calibrated flight time t0 to the central processing module, and calculate the measured flight time t1 according to the measurement echo signal and send the measured flight time t1 to the central processing module;
the channel selection unit is configured to select the automatic calibration unit and the rainfall measurement unit to work alternately under the control of the central processing module, send the pulse signals to the automatic calibration unit and the rainfall measurement unit respectively, and receive the calibration echo signal collected by the automatic calibration unit and input the calibration echo signal into the time measurement unit, and the channel selection unit is also configured to receive the measurement echo signal collected by the rainfall measurement unit and input the measurement echo signal into the time measurement unit;
the automatic calibration unit includes a first self-calibrating ultrasonic probe and a second self-calibrating ultrasonic probe, and the first self-calibrating ultrasonic probe and the second self-calibrating ultrasonic probe are arranged directly opposite each other with a fixed distance and same frequency, and the first self-calibrating ultrasonic probe is a transmitting probe, used to transmit the ultrasonic signal to the second self-calibrating ultrasonic probe under a control of the pulse signal; the second self-calibrating ultrasonic probe is a receiving probe, used to receive the calibration echo signal;
the rainfall measurement unit includes a first measuring ultrasonic probe and a second measuring ultrasonic probe, the first measuring ultrasonic probe is a transmitting probe for transmitting the ultrasonic signal to the water surface under the control of the pulse signal; the second measuring ultrasonic probe is a receiving probe for receiving the measurement echo signals reflected by the water surface.