| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the density and concentration of sludge without disturbing an interface between a liquid and the sludge. SOLUTION: Since an ultrasonic wave transmission reception sensor 1 is fixed and installed at a prescribed position in supernatant water 2, so that the interface is not disturbed. The measurement principle uses that the ultrasonic wave pulse transmitted from a sensor 1 is reflected at the interface 4 between the supernatant water 2 and the sludge 3 and the amount of the diffusion and the amount of attenuation of the ultrasonic wave pulse until being received by a reception means 6 are proportional to the density. The depth to the interface is acquired from the propagation time of the ultrasonic wave pulse by an operating means 9. The density is acquired from the depth, a reception amplitude value measured by a measurement means 7 and the standard value of the reception amplitude value stored in a storage means 14 beforehand by an operating means 12. COPYRIGHT: (C)2003,JPO
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