D.A.D. FBG Temperature Sensor

A D.A.D. Fiber Bragg Grating (FBG) is a type of distributed Bragg reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others. This is achieved by creating a periodic variation in the refractive index of the fiber core, which generates a wavelength specific dielectric mirror. A FBG can therefore be used as an inline optical filter to block certain wavelengths, or as a wavelength-specific reflector.

How It Works:

Utilizing a D.A.D. FBG sensor, a laser is emitted from a transmitter along the length of the fiber optic. Upon reaching the FBG sensor, a certain amount of laser light is reflected back to the receiver module. If there is a change in the temperature surrounding the FBG sensor, the reflected wavelength will differ. Through our proprietary algorithm, the temperature change will be detected and calculated. The FBG sensor will be calibrated during production to ensure accurate reading of temperature. It can measure a range of –20°C to 300°C.

The D.A.D. FBG sensor is encased in a non-conductive ceramic which is molded around the FBG sensor, providing protection for the sensor. The ceramic enclosure is also a good thermal conductor thus providing the sensor with a high degree of accuracy in reading the temperature.