Inductance strain gauge

Details Inductance strain gauge Inductance strain gauge

1988-05-12

1989-12-26

Kozma, Thomas J.

Inductor devices

With condition-responsive inductance adjusting means

33DIG13, 73779, 7386264, 336 75, 336136, H01F 2106

Patent

active

048900842

ABSTRACT:
Side-by-side inductor coils are wound in a single layer around a thin flat tubular frame. The frame has a closed end portion and is mounted on an insulative base sheet. An elongated thin magnetic core is cantilevered from a insulative connecting rod and normally is positioned inside the frame approximately centered between the two coils. The end portion of the connecting rod remote from the frame is secured to the base sheet. The base sheet can be applied to a specimen to be stress tested and is formed to withstand elongation and compression. Lengthwise sliding of movement of the magnetic core in the coil frame due to stress applied to the specimen indicates the strain of the specimen.

REFERENCES:
patent: 2438359 (1948-03-01), Clapp
patent: 2854646 (1958-09-01), De Michele
patent: 2870630 (1959-01-01), Silvertsen
patent: 3000079 (1961-09-01), Howell et al.
patent: 3223952 (1965-12-01), Slenker
patent: 3295365 (1967-01-01), Larrigan et al.
patent: 3858138 (1974-12-01), Gittleman et al.
patent: 4623840 (1986-11-01), Fujimura et al.
Mark's Standard Handbook for Mechanical Engineers, Ninth Edition, McGraw-Hill Book Company, N.Y., 1987, pp. 5-57 to 5-61.

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