Measuring and testing – Dynamometers – Responsive to multiple loads or load components
Patent
1989-05-05
1991-04-30
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to multiple loads or load components
73172, A61B 510, G01L 500, G01L 114
Patent
active
050107720
ABSTRACT:
A capacitive measuring pad is constructed of transverse conductive strips separated by a compressible insulator to form a matrix of pressure sensitive capacitive nodes. The nodes are repetitively scanned in sequence by a microcomputer to measure their respective capacitances, from which measurements a pressure map is then derived. The resulting pressure map may be displayed on a color graphics monitor with different colors representing diffrent pressures. Node capacitance is found by measuring the response of the mode to a driving signal of a known voltage. This measurement is accomplished by connecting one of the node's transverse conductive strips to the driving source and the node's other conductive strips to a sense amplifier. In order to isolate the node of interest from the influence of surrounding nodes, all of the conductive strips except the two intersecting the selected node are connected to ground. Furthermore, the input impedance to ground of the sense amplifier is made negligibly small with respect to the other system impedance. In this way, only the conductive strip connected to the driving source has a voltage impressed on it, and the conductive strips of all other nodes in the system are maintained at ground potential, thus allowing an accurate measurement of the one capacitance.
REFERENCES:
patent: 2378039 (1945-06-01), Schenker
patent: 2644332 (1953-07-01), Ulrich
patent: 3118133 (1964-01-01), Meeker et al.
patent: 3818756 (1974-06-01), Barron et al.
patent: 3894437 (1975-07-01), Hagy et al.
patent: 3926177 (1975-12-01), Hardway Jr. et al.
patent: 4030347 (1977-06-01), Norris et al.
patent: 4033332 (1977-07-01), Hardway Jr. et al.
patent: 4102422 (1978-07-01), Christiansson
patent: 4134063 (1979-01-01), Nicol et al.
patent: 4136682 (1979-01-01), Pedotti
patent: 4144877 (1979-03-01), Frei et al.
patent: 4250894 (1981-02-01), Frei et al.
patent: 4266263 (1981-05-01), Haberl et al.
patent: 4267728 (1981-05-01), Manley et al.
patent: 4320766 (1982-03-01), Alihanka et al.
patent: 4353056 (1982-10-01), Tsikos
patent: 4367385 (1983-01-01), Frame
patent: 4381788 (1983-05-01), Douglas
patent: 4402326 (1983-09-01), Okano et al.
patent: 4437138 (1984-03-01), Nicol
patent: 4526043 (1985-07-01), Boie et al.
patent: 4600016 (1986-07-01), Boyd et al.
patent: 4644801 (1987-02-01), Kustanovich
patent: 4827763 (1989-05-01), Bourland et al.
Katz et al.-"A MOS LSI Capacitive Keyboard Interface Chip", 1978 IEEE International Solid-State Circuits Conference, Digest of Technical Paper, pp. 202-203, Feb. 1978.
Barbs Charles F.
Bourland Joe D.
Geddes Leslie A.
Graber George P.
Tacker, Jr. Willis A.
Purdue Research Foundation
Ruehl Charles A.
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