公开(公告)号：US3900839A

公开(公告)日：1975-08-19

申请号：US44091374

申请日：1974-02-08

Applicant: BUNKER RAMO

Inventor： LYNCH THOMAS H ,  PATTEN III HUDSON T

IPC: G01H5/00 ,  G01S7/52 ,  G08C19/16 ,  G01V1/00

CPC classification number: G01H5/00 ,  G01S7/52004

Abstract: Apparatus and method are disclosed for measuring the speed of sound in water and other liquids with an accuracy in the order of + OR - 1/50,000 by using a single transducer and a reflecting target in an arrangement that detects the zero-crossover at the end of the first full cycle of the second reflected signal, and actuates the transducer at that time for retransmission of the acoustic signal. A standing wave produced by this method allows the input dynamic range to be in excess of 12 db. Operation of the apparatus is monitored through the power supply cable by momentarily shunting one of two resistors connected in series therewith in response to each retransmission. This monitoring technique allows the monitoring instruments to remain on the surface of the liquid with the power supply and one of the two resistors. A tunnel-diode threshold detector improves stability of operation over a wide range of temperatures.

公开(公告)号：US3482647A

公开(公告)日：1969-12-09

申请号：US3482647D

申请日：1968-11-19

Applicant: BUNKER RAMO

Inventor： LYNCH THOMAS H ,  PATTEN HUDSON T

IPC: G01N29/024 ,  G10K11/00

CPC classification number: G01N29/024 ,  Y10S367/902

公开(公告)号：US3522580A

公开(公告)日：1970-08-04

申请号：US3522580D

申请日：1968-11-19

Applicant: BUNKER RAMO

Inventor： LYNCH THOMAS H ,  PATTEN HUDSON T

IPC: G01H5/00 ,  G01S9/66

CPC classification number: G01H5/00