Abstract
Water vapor existing inside internal end-face gaps of optical components of an optical fiber sensing system makes it possible to influence the measurement accuracy and stability. The influence principle has been briefly analyzed based on the structure of three main optical components: a distributed feedback laser diode (DFB-LD), a collimator, and a photoelectric diode (PD). With application of a differential technique, the influence of water vapor inside the DFB-LD can be removed. With reasonable recombination of the collimator and the PD in a dual-beam detection system, the influence of water vapor inside the collimator and the PD’s end-face gaps has been suppressed from more than to as low as in absorbance. After isolation processing water vapor inside the end-face gaps of the DFB-LD, the collimator, and the PD can be utilized as a reference to design a simple but feasible sensor. As a result, good linearity with an of 0.9964 has been realized in a concentration range of 39–2110 ppm during an application test, and a long-term test of the designed sensor against the S8000 with a difference of 10 ppm has been achieved.
© 2013 Optical Society of America
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