Ultrasonic receiver

Details Ultrasonic receiver Ultrasonic receiver

2008-05-28

2011-10-25

Caputo, Lisa (Department: 2855)

Measuring and testing

Vibration

By mechanical waves

C073S584000, C073S634000

Reexamination Certificate

active

08042398

ABSTRACT:
An ultrasonic receiver according to the present invention includes: a wave propagating portion6, which defines a first opening63and a waveguide60that makes an ultrasonic wave, coming through the first opening63, propagate in a predetermined direction; and a propagation medium portion3, which has a transmissive interface61and which is arranged with respect to the waveguide60such that the transmissive interface61defines one surface of the waveguide60in the direction in which the ultrasonic wave propagates. The interface61is designed and arranged with respect to the waveguide60such that as the ultrasonic wave propagates along the waveguide60, each portion of the ultrasonic wave is transmitted into the propagation medium portion3through the interface61and then converged toward a predetermined convergence point. The receiver further includes a sensor portion2, which is arranged at the convergence point33to detect the ultrasonic wave converged. The propagation medium portion includes a propagation medium that fills a space between the interface and the convergence point. The waveguide is filled with an environmental fluid and acoustic velocities Cnand Caof the ultrasonic wave propagating through the propagation medium portion3and the environmental fluid4, respectively, satisfy Cn/Ca<1. If a distance from the first opening of the waveguide to a point P, which is set at an arbitrary location on the transmissive interface, is Laas measured in the ultrasonic wave propagating direction and if a distance from the point P to the convergence point is Ln, then La/Ca+Ln/Cnis always constant irrespective of where the point P is located.

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International Search Report for corresponding Application No. PCT/JP2008/060256 mailed Sep. 18, 2008.
Form PCT/ISA/237.

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