Abstract
By using the optical frequency reflectometry method and modulated laser diode, it is possible to read many fiber Bragg grating (FBG) sensors at high speed. In this method, the measurement range by the sensor is limited by the wavelength sweep range of the light source. Since the range of the wavelength sweep by the modulated laser diode is as narrow as several hundreds of pm, the measurement range also becomes narrow. In order to overcome this limitation, we are considering using multiple modulated laser diodes at the same time. Light beams from multiple modulated laser diodes modulated with different frequencies are superimposed and used for sensor reading. Signals for each light source can be separated by using frequency analysis. In experiments, light of multiple laser diodes was superimposed and made incident on the sensor, and frequency analysis of the reflected light from the sensor was successfully performed to separate the signals for each light source.
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