G - Physics – 08 – C
Patent
G - Physics
08
C
340/136
G08C 21/00 (2006.01) G01D 5/38 (2006.01)
Patent
CA 2009692
OPTICAL GRATING SENSOR AND METHOD OF MONITORING ABSTRACT OF THE DISCLOSURE The sensor and method of monitoring of the invention uses light diffracted from diffracting elements having at least one region of nonuniformity. The sensor is useful for monitoring displacement, stress, temperature and pressure. In one form of the invention, a diffraction grating is fabricated from first and second grating and has a step-wise change in the grating period at an inter-grating boundary. The grating is illuminated with broadband light that is diffracted as a function of the irradiated position on the grating with the wavelength of the diffracted light and the change in wavelength being a function of the diffraction grating position. In another form of the present invention, a diffraction grating is provided with a variable grating period that can vary linearly, exponentially, or in accordance with some other function with the wavelength of the diffracted light being a function of the relative displacement of the grating. Additionally, gratings can be combined to provide a transducer that provides an output that can be compensated for temperature variation.
Bereskin & Parr
Simmonds Precision Products Inc.
Spillman William B. Jr.
LandOfFree
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