The effects of surface contamination on the performance of a
D-fiber evanescent wave methane sensor are discussed. Contamination on the flat
surface of the D-fiber will modify both the scale factor of the methane
detection system and the birefringence of the D-fiber.
The birefringence variation can be monitored and used to
compensate for the scale factor variation, through one of the two compensation
models which will be described in the text. The models are found to be fairly
accurate, and for the D-fiber used in our experimental tests, the maximum
relative error for scale factor correction is about ±5%, for both models.
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