为了满足电力系统中对SF6气体精确测量的需求, 基于非分光红外差分检测原理, 设计了一种便携式的SF6气体传感器。系统采用单光束双波长结构, 对直射式和梯形反射式气室进行光学仿真, 最终确定了气室类型, 提高了系统的紧凑性和灵敏度。在电路方面设计了一种小信号放大滤波电路, 有效地将有用信号从噪声中提取出来; 传感器采用高精度高性能模数转换器将模拟电信号转换为数字信号送入单片机处理, 大大提高了检测精度。实验结果表明, 该传感器能够准确检测体积分数为0~2×10-3范围内的SF6气体, 满量程精度可达4.2%。
Abstract
In order to satisfy the actual need of accurate measurement of SF6 gas concentration in the electrical system, a portable SF6 gas sensor was designed based on non-dispersive infrared (NDIR)differential detection principle, which adopted the single-beam and dual-wavelength optical structure. In order to improve the compactness and sensitivity of the system, the optical simulations of the straight and trapezoidal reflective gas chambers were carried out, and the gas chamber type was finally determined. As for designing hardware circuit, a small signal amplification filter circuit was designed to effectively extract the useful signal from the noise. The sensor uses the high precision and performance analog-to-digital converters to convert analog electrical signals into digital signals into single chip processor, which greatly improves the detection accuracy. The experimental results show the sensor can accurately measure the SF6 concentration in a range of 0~2×10-3, with the full range accuracy up to 4.2%.
关键词
AD转换 /
放大滤波 /
气室仿真 /
SF6气体
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Key words
SF6 gas /
amplification and filtering /
gas chamber simulation /
AD conversion
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基金
国家自然科学基金(11374161);江苏省重点研发计划(BE2016756);江苏高校优势学科Ⅱ期建设工程; 江苏省高校品牌专业建设工程资助项目; 国家级大学生实践创新训练计划项目(201610300030, 201710300015)
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脚注
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