| 摘要 |
A sonic water level measuring method and system for mounting a wave-guide tube for measuring a water level in a reservoir, a river, etc. generating sonic pulses at the upper of the wave-guide tube, measuring transit times that it takes for the sonic pulses to transit them through air medium and transit back to an original point after being reflected on the water surface, and multiplying the transit times by a sound velocity to compute a water level comprises steps of measuring the sound velocity using the times that it takes for the sonic pulse to transit in two intervals in order to exactly measure the sound velocity that is changed according to the changing of an air temperature, pressure and component in the wave-guide tube; and measuring the water level considering an arithmetical average value of the sound velocities measured as a sound velocity in the wave-guide tube.
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