Abstract
A temperature adaptive fiber Bragg grating (FBG) vibration sensor system of low frequency based on narrow line width distributed feedback (DFB) laser is investigated. By automatic controlling the temperature of the DFB laser, the wavelength of the DFB laser can be locked in -3dB reflectivity spectrum of FBG. So the system can realise the self adaptation of the temperature changes. Using the reference channel, the measurement precision of the system was improved by wiping off the power noise of the DFB laser. Experiments show that this sensor has the smallest acceleration of 1mm/s2 and the sensitivity of 6.2V/m/s2.
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