title: Silicon-carbide-based extreme environment temperature sensor using wavelength-tuned signal processing.
abstract: A wavelength-tuned signal-processing approach is proposed for enabling direct unambiguous temperature measurement in a free-space targeted single-crystal silicon carbide (SiC) temperature sensor. The approach simultaneously exploits the 6H SiC fundamental Sellmeier equation-based wavelength-sensitive refractive index change in combination with the classic temperature-dependent refractive index change and the material thermal-expansion path-length change to encode SiC chip temperature with wavelength. Presently, the technique is useful for fast coarse temperature measurement as demonstrated from room temperature to 1000 degrees C using a 10-peak count wavelength-tuned measurement with a 0.31 nm total wavelength change. This coarse technique can be combined with the previously presented two-wavelength signal-processing temperature measurement approach to simultaneously deliver a wide temperature range and a high-resolution temperature sensor. Applications for the sensor range from power plants to materials processing facilities.
authors.affiliation: Photonic Information Processing Systems Laboratory, CREOL, The College of Optics, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2700, USA. riza@creol.ucf.edu
authors.forename: Nabeel A
authors.initials: NA
authors.lastname: Riza
authors.forename: Mumtaz
authors.initials: M
authors.lastname: Sheikh