Velocimeter, sound

High Pressure Sound Velocimeters. As discussed earlier, sound velocity measurements can yield precise compressibilities of solutions. Wilson (109) was the first to develop a high pressure sound velocimeter that could be used over a wide range of pressures and temperatures. He used the "sing around" system to measure the high pressure sound speeds of water (109), D2O (120), and seawater (121) to a precision of 0.2 m sec l which is equivalent to 0.012 x 10 bar- in 6s Barlow and Yazgan... 

The system was calibrated with water and the sound path (A) was found to increase slightly as the pressure is increased (assuming t is independent of pressure) (112). Since we are interested in measuring the relative speed of sound (Au) in aqueous solutions, we use the velocimeter in a differential mode. The value of t is not a function of pressure (or temperature), as the electronics are kept under ambient pressures. The values of Au were determined from... 

Figure 12, Sketch of the high pressure sound velocimeter (A) constant temperature bath (B )bomb stand (C) pressure bomb (D) plug (E) transmitting transducer (F) reflector (G) O-ring (112)...

BOTTOM DETAIL FATHOMETERS. SOUND VELOCIMETER. UNDERWATER TELEPHONE. LONG DISTANCE TELEMETRY AND CONTROL FISH FINDING... 

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