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31. Then the demodulated signal and the signal of the reference piezoelectric hydrophone were input into a high-resolution digital phase detector to get the phase difference.

32. The results indicate that ESPRIT algorithm based on vector sensor can obtain higher resolution frequency estimation than that based on pressure hydrophone.

33. Optic fiber hydrophone has the highest sensitivity among current underwater sensors.

34. The hydrophone is constructed with a pressure hydrophone and particle velocity hydrophone,(www.Sentencedict.com) and is called combined hydrophone.

35. Abstract: Optic fiber hydrophone has the highest sensitivity among current underwater sensors.

36. Usually, we use three components velocity detector to measure X-component, Y-component and Z-component of velocity field. We use the hydrophone tu measure stress field.

37. This paper reports on a kind of vector hydrophone of resonant-column type in which a piezoelectric bilaminar are used as the sensing element.

38. At the meantime, the differences in performances, signal transmission and processing and other aspects between optic fiber hydrophone and traditional piezoelectric transducer have been given.

39. On the basis of lots of preliminary tests of the hydrophone, sound pressure sensitivity in the air and directivity pattern were tested as well as the ability of receiving sound signal in water.

40. Crosstalk is one of many puzzles that baffled the application to time-division multiplexing(TDM) technology for fiber-optic hydrophone array.