Wide range periodic waveguide temperature sensor

In this paper, we design and analyze a periodic dielectric Bragg grating waveguide temperature sensor ranging from room temperature to over 1200 °C. By using this sensor combined with a wavelength shifting detector and radiation detection schemes, a wide range thermometer can be built. Temperature can be measured in two ways using our thermal sensor. One way is to detect the wavelength shifting by an optical spectrum analyzer (OSA). The wavelength shifting could be converted to the change of environment temperature. This method is appropriate for the temperature range from 20 °C to 600 °C. Another way is to detect the power of the probe radiation for the temperature range of over 600 °C to the melting point of the probes. This sensor has many applications including in aerospace structures.