Stress detector

Details Stress detector Stress detector

1985-12-31

1988-01-05

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73779, 324209, G01L 310, G01B 724

Patent

active

047167734

ABSTRACT:
A stress detector including an AC power source for generating an AC symmetrical wave form voltage, an exciting coil driven by the AC power source for alternatingly magnetizing at least a portion of a ferromagnetic material to be measured in a predetermined direction, a detecting coil for detecting a magnetic flux generated due to the alternating magnetization, and an adder circuit for taking out a part of a voltage applied to the exciting coil, setting an amplitude and a phase of a wave form of the taken-out part of the voltage to preset values, adding the voltage thus obtained to a voltage induced in the detecting coil. The detector gives an output signal representative of a value of stress applied to the material to be measured as a variation either in amplitude or phase depending on the preset phase.

REFERENCES:
patent: 2912642 (1959-11-01), Dahle
patent: 3498124 (1970-03-01), Soulant
patent: 4306462 (1981-12-01), Meixner

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