Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Reexamination Certificate
2006-06-27
2006-06-27
Kwok, Helen (Department: 2856)
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
C310S329000, C310S333000, C310S360000
Reexamination Certificate
active
07066026
ABSTRACT:
The present invention is directed to an acoustic vector sensor, also called particle velocity sensor. <111> direction poled, shear mode, relaxor single crystals are used as the sensing elements. In addition, these crystal plates are cut at a special orientation such that they provide zero or minimum responses in the transverse directions, but have a maximum piezoelectric response in sensing direction. The piezoelectric sensor contains a proof mass, a base, and an aforementioned relaxor crystal. Three of the sensors are mounted orthogonally with a rigid case, and they are designated to sense the acoustic particle velocity in three designated directions, say X, Y, and Z. To solve the adverse lateral constraint problem (also known as clamping effect) associated with the relaxor crystal; reduced bonding area between the proof mass and the relaxor crystal are introduced. This feature greatly reduced the percentage of the bonding area for the crystal; consequently the free-state piezoelectric properties of the relaxor crystals are preserved.
REFERENCES:
patent: 3735161 (1973-05-01), Perkins et al.
patent: 4928263 (1990-05-01), Armstrong et al.
patent: 6038924 (2000-03-01), Lee et al.
patent: 6209395 (2001-04-01), Kristensen
patent: 6370084 (2002-04-01), Cray
patent: 6697302 (2004-02-01), Cray et al.
patent: 6715363 (2004-04-01), Deng et al.
International Search Report, Mar. 9, 2005.
Written Opinion of the International Searching Authority, Mar. 9, 2005.
Davis Paul
Heller Ehrman LLP
Kwok Helen
Wilcoxon Research, Inc.
LandOfFree
Underwater acoustic vector sensor using transverse-response... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Underwater acoustic vector sensor using transverse-response..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Underwater acoustic vector sensor using transverse-response... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3704564