| 摘要 |
A sonic level measuring method comprises steps of disposing N sonic receive rs 1,5 2, 5 3, ~5n at a constant interval ~ toward a water surface along the longitudinal portion of a waveguide tube, oscillating sonic pulses to detect the number N i of th e sonic receivers and computing an interval L i = (N i - 1)~ between a sonic receiver 5i that is positioned on the original point for the water level measurement, measuring a transit time t1 (see formula I) that it takes for the sonic pulse to be transited between a sonic receiver 5i-1 and the sonic receiver 5i, measuring a transit time t2 = (see formula II) from the receiving moment of the advancing sonic pulse until the sonic pulses are reflected on the water surface and then aga in received by the sonic receiver 5i, computing an interval .DELTA.L between the sonic receiver 5i and the water surface, adding the interval .DELTA.L to Li and obtaining a distance Lx = Li + .DELTA.L thereby to measure the water level.
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