金涂覆光纤传输损耗特性及修正方法研究

Research on Transmission Loss Characteristics and Correction Methods of Gold-Coated Optical Fibers

摘要:

普通的丙烯酸酯涂覆光纤的工作温度通常为-65 ℃~80 ℃，常见的耐高温聚酰亚胺涂覆光纤工作温度最高为300 ℃。在更高温度工况下，通常采用金属涂覆的特种光纤进行信号传输，如铝涂覆、铜涂覆、金涂覆光纤。本文通过测试金涂覆光纤在不同环境温度下的传输损耗，发现在环境温度变化时，金涂覆光纤的传输损耗变化较大。针对基于黑体辐射原理的光纤温度传感器，传输损耗变化引入的误差可超过60 ℃。在此基础上，本文基于不同波段的光在金涂覆光纤中的传输特性，提出了一种双波段修正方法，能够对环境温度引起的光纤传输损耗进行修正。修正之后，传输损耗引起的误差小于15 ℃。

Abstract:

The operating temperature of common acrylic-coated optical fibers is usually -65 °C to 80° C, and the working temperature of common high-temperature polyimide-coated optical fibers is up to 300 °C. At higher temperatures, metal-coated special optical fibers, such as aluminum-coated, copper-coated, and gold-coated fibers, are usually used for signal transmission. In this paper, the transmission loss of gold-coated fibers is tested at different ambient temperatures, and it is found that the transmission loss of gold-coated fibers varies greatly when the ambient temperature changes. For fiber optic temperature sensors based on the blackbody radiation principle, the error introduced by the variation in transmission loss can exceed 60 °C. On this basis, based on the transmission characteristics of light in different bands in gold-coated fibers, a dual-band correction method is proposed, which can correct the transmission loss of optical fibers caused by ambient temperature. After the correction, the error caused by the transmission loss is less than 15 °C.