Automatic triggering and self-calibrating ultrasonic rain measuring system

Abstract

The invention discloses an automatic triggering and self-calibrating ultrasonic rain measuring system. The system comprises a rainfall monitoring module, a self-calibrating and rainfall measuring module, a central processing module, a water level monitoring module and a drainage module, wherein the rainfall monitoring module is used for monitoring rainfall and sending a rainfall signal; the self-calibration and rainfall measurement module is used for transmitting and receiving an ultrasonic signal under the control of the central control module to obtain calibration flight time, and is used for transmitting the ultrasonic signal to a water accumulation surface in the rainfall barrel and receiving a measurement echo signal reflected by the water accumulation surface under the control of the central control module to obtain measurement flight time; the central processing module is used for receiving the rainfall signal, starting the water level monitoring module and the self-calibration and rainfall measurement module, calculating to obtain a rainfall numerical value and outputting the rainfall numerical value in a fixed format; the water level monitoring module is used for monitoring the water level in the rainfall barrel and sending a drainage signal; and the drainage module is used for receiving the drainage signal and opening a drainage valve to drain accumulated water in the rainfall barrel.

Description

technical field [0001] The invention relates to the technical field of hydrological and meteorological measurement, in particular to an automatic trigger and self-calibration ultrasonic rain measurement system. Background technique [0002] The common rain gauges are weighing rain gauge, siphon rain gauge and tipping bucket rain gauge. Since weighing and siphon rain gauges require manual measurement, the degree of automation is low; the tipping bucket of the tipping bucket rain gauge has four capacities, 0.1mm, 0.2mm, 0.5mm, and 1mm, of which 0.1mm capacity is used the most, but There are also defects. Although the accuracy of 0.1mm is relatively high, after the rainfall increases, there will be lag and splashing when the tipping bucket is turned, so the error is relatively large. And it belongs to the structure of mechanical rotation, which affects the service life and requires regular maintenance. [0003] At present, because of the high penetration of the ultrasonic tra...

AI Technical Summary

Problems solved by technology

Now there are many rain gauges made of ultrasonic technology. The propagation of ultrasonic waves in the air is affected by temperature and atmospheric pressure. The compensation of ultrasonic speed for ultrasonic rain gauges at this stage is limited to temperature and air pressure, but sensors for measuring air pressure and temperature There are errors in itself, and there is uncertainty in the measurement accuracy. Moreover, the system uses too many measurement equipment, and there are hidden dangers in the stability. In addition, the current rain measurement system basically belongs to continuous work or is triggered by a tipping bucket. The tipping bucket is a mechanical rotation method. Frequent maintenance is required, not smart enough, and the continuous operation of the system affects the service life of the ultrasonic probe, and also increases the power consumption of the system

Some ultrasonic rain gauges use liquid-mediated probes or single probes, which have the disadvantage of large measurement blind spots

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