Title:
METHOD AND APPARATUS FOR MAKING HIGH-PRECISION MEASUREMENTS
Document Type and Number:
WIPO Patent Application WO2003048688
Kind Code:
A3
Abstract:
A method and apparatus for measuring a predetermined parameter, by providing a displaceable sensor (13) on a mounting member (12) such that the displaceable sensor (13) changes in location, form or length with respect to the mounting member (12) in accordance with the predetermined parameter. A cyclically-repeating energy wave is transmitted to or through the displaceable sensor (13), and a predetermined fiducial point in the received cyclically-repeating energy wave is detected and used for continuously changing the frequency of the transmitted cyclically-repeating energy wave such that the number of waves received is a whole integer. The change in frequency is used to produce a measurement of the predetermined parameter. Several embodiments are described wherein the displaceable sensor is a deformable membrane (13), an end wall of a bellows (23), a spring-mounted member (33, 43) a displaceable plunger (53), and a bar changing (163) its length in accordance with the parameter to be measured.
Inventors:
ARIAV ARIE (IL)
Application Number:
PCT/IL2002/000983
Publication Date:
April 08, 2004
Filing Date:
December 05, 2002
Export Citation:
Assignee:
NEXENSE LTD (IL)
ARIAV ARIE (IL)
ARIAV ARIE (IL)
International Classes:
G01D5/48; (IPC1-7): A61B5/00
Foreign References:
| US6290650B1 | 2001-09-18 | |||
| US5984874A | 1999-11-16 | |||
| US5154680A | 1992-10-13 | |||
| US5394882A | 1995-03-07 | |||
| US5107846A | 1992-04-28 | |||
| US4945916A | 1990-08-07 | |||
| US5195375A | 1993-03-23 | |||
| US5194910A | 1993-03-16 |
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