Locally compensated deformation sensor

Details Locally compensated deformation sensor Locally compensated deformation sensor

1989-12-14

1991-06-11

Raevis, Robert

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

G01B 716

Patent

active

050222724

ABSTRACT:
A deformation sensing device, and related method, for measuring overall deformation of a structural member subject to deformation by an actuator. The device includes a first sensor located in a region of influence of the actuator and a second sensor located outside but near to the region of influence of the actuator. The device takes a weighted average of output signals from the two sensors, using weighting factors that, in one embodiment, are applied either electronically and are selected either as proportional to the lengths of the member regions under the influence of the actuator and not under the influence of the actuator, or are selected to provide a desired transfer function between input to the actuator and output from the sensing device. In other embodiments, weighting of the output signals is obtained by using different surface areas for the sensors or by appropriately positioning two shear-mode sensors in relation to the region of influence of the actuator.

REFERENCES:
patent: 2597751 (1952-05-01), Ruge
patent: 3184962 (1965-05-01), Gay
patent: 4418577 (1983-12-01), Arieh et al.
patent: 4674342 (1987-06-01), Ushijima et al.

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