介绍了一种用于海洋天然气水合物状态变化模拟实验中天然气水合物相变测试的光透射比光纤传感器.利用该传感器探测水合物状态变化过程中光透射比的变化,来测定水合物的相态变化.为了提高光纤传感器的测量准确度减小测量误差,在所研制的光纤传感器中采用了双光路结构,在测量透射光强的同时,测量参考光强以补偿光源光强的波动.另外,在光电转换电路中采用双探测器结构来消除光电探测器暗电流的影响.

An optical fiber sensor used in the simulating experiment of marine natural gas hydrates to measure the phase change of marine natural gas hydrates was introduced.The intensity change of transmission light during hydrates states change was measured by the sensor to determine the phase change.Dual optical path construction was employed in the optical fiber sensor in order that a high measuring precision would be obtained.The light intensity of reference beam was measured to compensate the fluctuation of light source while the intensity of transmission light was measured simultaneously.Besides,dual detectors were used in each photoelectric transfer circuit to eliminate the influence of dark current of the photodetector.