Diffractographic torque sensor

Abstract

Described is a novel torque sensor utilizing changes in the diffraction pattern of a slit aperture whose edges move relative to each other in proportion to the applied torque.

In common with other electro-optical torque sensors, the device is ‘noncontacting’ and, therefore, requires no slip rings and may be read visually. In this form, it is a very simple and inexpensive device, exhibiting no zero shift and capable of operation in extreme environments.

The principal disadvantage of the device is its inability to sense torque continuously through the rotational cycle.