BUBBLE WATER DEPTH MEASURING METHOD AND SYSTEM THEREOF

摘要

A water depth measuring method comprising the steps of making a bundle of reference tubes of a U shape of the number of n.gtoreq.2 having the same length as a water depth measuring tube; filling an amount of water into the reference tubes to form water columns; measuring the water pressure in the reference tube by a pressure transducer before measuring a water depth; subtracting water column pressures derived from the measured water pressures to calculate total errors .SIGMA..DELTA.i and .SIGMA..DELTA.j calculating a total error, .SIGMA..DELTA.x based on the total errors .SIGMA..DELTA.i and .SIGMA..DELTA.j ; subtracting the total error .SIGMA..DELTA.x from the bubble generating pressure, dividing the calculated water column pressures by the water column pressure in the reference tube having the most approximate value thereto and multiplying the re-calculated value b y the water column pressure thereby to measure a water depth in a higher accuracy.