Liquid level detecting apparatus

Details Liquid level detecting apparatus Liquid level detecting apparatus

2007-04-17

2007-04-17

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S642000, C073S644000

Reexamination Certificate

active

11513364

ABSTRACT:
A guide pipe is formed from a metal material, and its internal cross section has a circular shape whose diametric dimension gradually becomes smaller with a distance from an ultrasonic sensor. That is, the guide pipe is formed so that a route for transmitting an ultrasonic wave generated from the ultrasonic sensor may be tapered from this ultrasonic sensor toward a reflector plate. Thus, the acoustic pressure level of the ultrasonic wave which enters the reflector plate can be made higher than a value in a prior-art liquid level detecting apparatus. Accordingly, the energy of the ultrasonic wave generated from the ultrasonic sensor can be utilized for liquid level detection at a high efficiency, so that a fuel liquid level detecting apparatus capable of accurate liquid level detection can be provided.

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