Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1982-04-01
1984-01-31
Hoffman, James R.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427102, 427103, 73 1B, 73765, G01B 720, G01L 122
Patent
active
044289766
ABSTRACT:
A thin film strain gage structure (10, 110) for measuring the strain of an inflectible element (12, 112) wherein the gage is formed on a surface (15, 115) of the element and includes a sensing resistance (16, 116) and an adjusting resistance portion (21, 121). Connecting taps are formed in relationship to the resistors to permit adjustment of the adjusting resistor values by suitable connection to selected ones of the taps. The adjusting resistance is preferably disposed adjacent the sensing resistance so as to be subject to similar ambient conditions. The sensing resistance may be provided in the form of a Wheatstone bridge circuit with the adjusting resistors connected in series with two legs of the bridge. Adjustment of the adjusting resistance may be effected selectively by shorting out portions thereof or by suitably connecting to different portions thereof. In one form, the adjustment is effected so as to provide variable ratio between two portions of the resistance connected between legs of the bridge circuit.
REFERENCES:
patent: 2547926 (1951-04-01), Cook
patent: 2677271 (1954-05-01), Faris et al.
patent: 3303693 (1967-02-01), Stedman
patent: 3697918 (1972-10-01), Orth et al.
patent: 4185496 (1980-01-01), Tisone et al.
patent: 4217785 (1980-08-01), Spoor
Eisele Walter H.
Koneval Donald J.
Krueger Helmut H. A.
Lajos Robert E.
Bueker Richard
Gould Inc.
Hoffman James R.
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