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Improved algorithm based on a fiber loop: applications for optical water vapor sensor

机译：基于光纤环的改进算法：光学水蒸气传感器的应用

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摘要

An improved algorithm based on a fiber loop optical structure is proposed for measurement of water vapor concentration. Compared with the traditional algorithm, the intrinsic loss of optical devices in the loop is no longer necessary to be accurately measured but instead is directly eliminated by normalization. The concentration of the analyte can be determined by only two pulses without the need for exponential curve fitting, which leads to a significant reduction in the amount of data required to make a measurement. The restriction on the inherent loss of the fiber loop system also can be eased. In addition, a background absorption problem caused by the water vapor existing inside internal end-face gaps of optical components is solved. The mean absolute error of 29 parts per million by volume has been achieved with a 6.5 cm gas gap by using the new algorithm.
机译：提出了一种基于光纤环光学结构的改进算法来测量水蒸气浓度。与传统算法相比，环路中光学设备的固有损耗不再需要精确测量，而是通过归一化直接消除。仅需两个脉冲即可确定分析物的浓度，而无需进行指数曲线拟合，从而大大减少了进行测量所需的数据量。也可以减轻对光纤环路系统固有损耗的限制。另外，解决了由光学部件的内部端面间隙内部存在的水蒸气引起的背景吸收问题。通过使用新算法，在6.5 cm气隙的情况下，实现了按体积计百万分之29的平均绝对误差。

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