Abstract
Fiber optic sensors based on Fiber Bragg Grating (FBG) technology have been successfully adopted for sensor measurements for almost two decades. The advantages offered by FBG sensors, such as Electro-Magnetic Interference immunity and inherent intrinsic safety, provide motivation for the development of a commercial measurement platform. With the development of an FBG Fabry-Perot cavity, a sensor with sub-picometer spectral width allows for a factor of 1000 times improvement in strain measurement. This thesis presents the development of a highly-accurate optical measurement platform based on the FBG Fabry-Perot cavity and Pound-Drever-Hall (PDH) laser locking technique that is demonstrated through the development of an optical torque sensor. With the fiber optic sensor designed as per the PDH requirements, the platform achieved a measurement accuracy of +/-0.015% of the full-scale torque value of 188N∙m. With the platform at ~$2,000, a successful demonstration of the platform and a fiber optic torque sensor is presented.
Highlights
As the world begins to see larger electrification and the cost of integrating electronics reduces, sensors are being integrated more often to actively monitor for safety and improve performance and reliability of products during both manufacturing and operation
A fiber optic sensor and a high precision, low cost optical measurement platform based off the Pound-Drever-Hall (PDH) technique is demonstrated by measuring torque applied to an aluminum torsion rod and the measurement performance is compared against foil strain gauge measurements
To ensure the wavelength shift of the Fiber Bragg Grating (FBG)-FP sensor due to an applied torque is correct, a calibration was performed without using the PDH measurement platform
Summary
As the world begins to see larger electrification and the cost of integrating electronics reduces, sensors are being integrated more often to actively monitor for safety and improve performance and reliability of products during both manufacturing and operation. The measurement technology most often used in torque sensors commercially available today is a foil strain gauge; a technology that has remained almost unchanged since its invention in the early 1950’s [3]. It is a well-known and used technology, limitations due to electromagnetic interference susceptibility, lack of inherent intrinsic safety and degradation over time requiring re-calibration do still exist [4]. A fiber optic sensor and a high precision, low cost optical measurement platform based off the Pound-Drever-Hall (PDH) technique is demonstrated by measuring torque applied to an aluminum torsion rod and the measurement performance is compared against foil strain gauge measurements
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