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Fiber-optic sensor element is now available for applications requiring accurate measurements to 1000°C with better than +/- 1% accuracy.
Based on Chiral Photonics' chiral grating, fabricated by twisting a fiber as it is passed through a miniature heat zone to produce a distinct dip in the transmission spectrum. The spectral position of the dip in this chiral fiber changes with temperature allowing it to be used as a temperature sensor.
Both long-term temperature stability and temperature sensitivity were tested using a Micron Optics fiber interrogator to monitor sensors as they were cycled from room temperature to 1000°C. Use of the interrogator reduces characterization and testing time and increases accuracy with which the dip position can be measured. In addition, the dip position can be traced in real time. A micro-mirror may be attached to each chiral fiber so that they can be characterized in reflection, as required by the interrogator.
HelicaTM Sensors, fabricated from chiral long period gratings, can be used to optically sense environmental factors, such as chemical composition, temperature, and pressure.
