| 摘要 |
1,175,479. Measuring thickness of a silt layer, electrically. AMSTERDAMSCHE BALLAST MAATSCHAPPIJ N. V. Sept. 27, 1968 [Sept. 28, 1967], No. 46101/68. Heading G1N. The thickness of an underwater layer of silt is measured by lowering a probe 6 so that a first pressure transducer 7 on the tip of the probe completely penetrates the layer while a second pressure transducer 8 remains above the layer and feeding the outputs from the transducers to the X and Y inputs respectively of an X. Y recorder. The thickness of the silt layer is then deduced from the difference in depth of the probe (as represented by the output of the second transducer) between points on the recording where the first transducer enters the silt and where it reaches the bottom of the silt layer. The probe may be suspended directly from a cable as shown in Fig.1 or may be mounted on a hydraulic jack carried by a frame standing on the silt layer. The second transducer may incorporate a diaphragm. The first transducer may include strain gauges or may comprise a pressure difference gauge responding to the difference in pressure at two closely vertically spaced outlets through which water is fed under pressure from a surface vessel. |
