Sensor and method for manufacturing the same

Details Sensor and method for manufacturing the same Sensor and method for manufacturing the same

2006-07-25

2006-07-25

Chapman, John E. (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C073S632000, C310S336000

Reexamination Certificate

active

07080543

ABSTRACT:
A detecting-element assembly (40) is configured such that a piezoelectric element (51) is housed in a casing body portion (43) of a casing (42), and is attached to a housing portion (22) of a flow path formation member (20) via a flange portion (41). Therefore, the path between the piezoelectric element (51) and the position of attachment of the detecting-element assembly (40) is elongated, whereby ultrasonic waves which leak into the interior of the detecting-element assembly (40) from the piezoelectric element (51) become unlikely to reflectively return from a joint. Thus, the influence of, for example, noise stemming from reflected waves is reduced, thereby enhancing the accuracy of detection. An average clearance of 1 millimeter or more is provided along the outer circumferential surface of the casing body portion (43) of the detecting-element assembly (40), whereby a problem of collected foreign matter is unlikely to occur.

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