多气体一体化光纤网络传感系统研究
发布时间：2018-07-31 09:16
【摘要】：近几年，伴随着光纤通信技术的迅猛发展，光纤传感技术得以广泛应用，尤其在气体传感领域，例如矿井下瓦斯气体浓度的检测，大气环境的实时监测以及石油工业中泄露气体的检测等。光纤气体传感器相比于传统气体检测方法有着明显的优势，它不仅具有更高的探测灵敏度，在危险环境中本质安全；而且利用光通信技术可实现多气体远距离一体化传感。本论介绍了一种多气体一体化光纤网络传感系统。 本论文分析了近红外波段的气体光吸收原理，，探讨了可用于光纤气体传感探测的气体种类。介绍了差分检测原理，并基于此原理提出了多吸收峰差分检测技术以提高系统的信噪比，基于空分复用技术和波分复用技术提出了多气体一体化光纤传感网络实现方案。 设计并制作了用于差分吸收检测的F-P梳状滤波器。设计了结构简单的光学传感单元，并搭建了光学准直封装平台。由于系统要长期工作在各种复杂的环境中，设计并制作了具有防尘防水透气功能的实用型传感头。自主设计并制作了具有多点多气体同步检测功能的密闭性实验气室。 最后基于实验条件搭建了以甲烷为目标探测气体的多点光纤气体传感网络，并创新性的引入校准通道，提高了系统的稳定性和检测精度。测试了传感网络中用到的无源及有源光器件的性能以及整个系统的稳定性，利用本系统完成了甲烷气体单点和多点检测实验，检测系统达到了271ppm的探测灵敏度，并具有良好的多通道长期稳定性和一致性。
[Abstract]:In recent years, with the rapid development of optical fiber communication technology, optical fiber sensing technology has been widely used, especially in the field of gas sensing, such as the detection of gas concentration under mine. Real-time monitoring of atmospheric environment and detection of leaking gas in petroleum industry. Compared with the traditional gas detection method, optical fiber gas sensor has obvious advantages. It not only has higher detection sensitivity and is intrinsically safe in dangerous environment, but also can realize multi-gas long-distance integrated sensing using optical communication technology. This paper introduces a multi-gas integrated optical fiber network sensor system. In this paper, the principle of gas optical absorption in near infrared band is analyzed, and the kinds of gas which can be used in optical fiber gas sensing are discussed. The principle of differential detection is introduced. Based on this principle, the multi-absorption peak differential detection technology is proposed to improve the signal-to-noise ratio of the system. Based on space-division multiplexing technology and wavelength division multiplexing technology, the realization scheme of multi-gas integrated optical fiber sensor network is proposed. A F-P comb filter for differential absorption detection is designed and fabricated. A simple optical sensing unit is designed, and an optical collimation packaging platform is built. Because the system should work in various complicated environments for a long time, a practical sensor head with dustproof, waterproof and breathable function is designed and manufactured. An airtight experimental chamber with multi-point and multi-gas synchronous detection function was designed and manufactured. Finally, based on the experimental conditions, a multi-point optical fiber gas sensing network with methane as the target is built, and the calibration channel is introduced to improve the stability and detection accuracy of the system. The performance of passive and active optical devices used in sensor networks and the stability of the whole system are tested. The single-point and multi-point methane gas detection experiments are carried out using the system. The detection system achieves the detection sensitivity of 271ppm. And has good multi-channel long-term stability and consistency.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP212.9;TN929.11
本文编号：2155125
[Abstract]:In recent years, with the rapid development of optical fiber communication technology, optical fiber sensing technology has been widely used, especially in the field of gas sensing, such as the detection of gas concentration under mine. Real-time monitoring of atmospheric environment and detection of leaking gas in petroleum industry. Compared with the traditional gas detection method, optical fiber gas sensor has obvious advantages. It not only has higher detection sensitivity and is intrinsically safe in dangerous environment, but also can realize multi-gas long-distance integrated sensing using optical communication technology. This paper introduces a multi-gas integrated optical fiber network sensor system. In this paper, the principle of gas optical absorption in near infrared band is analyzed, and the kinds of gas which can be used in optical fiber gas sensing are discussed. The principle of differential detection is introduced. Based on this principle, the multi-absorption peak differential detection technology is proposed to improve the signal-to-noise ratio of the system. Based on space-division multiplexing technology and wavelength division multiplexing technology, the realization scheme of multi-gas integrated optical fiber sensor network is proposed. A F-P comb filter for differential absorption detection is designed and fabricated. A simple optical sensing unit is designed, and an optical collimation packaging platform is built. Because the system should work in various complicated environments for a long time, a practical sensor head with dustproof, waterproof and breathable function is designed and manufactured. An airtight experimental chamber with multi-point and multi-gas synchronous detection function was designed and manufactured. Finally, based on the experimental conditions, a multi-point optical fiber gas sensing network with methane as the target is built, and the calibration channel is introduced to improve the stability and detection accuracy of the system. The performance of passive and active optical devices used in sensor networks and the stability of the whole system are tested. The single-point and multi-point methane gas detection experiments are carried out using the system. The detection system achieves the detection sensitivity of 271ppm. And has good multi-channel long-term stability and consistency.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP212.9;TN929.11
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本文编号：2155125
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