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文摘
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探测系统的光源选择为垂直腔面发射激光器,选定水汽在1.854μm的吸收峰.系统自动在直接测量法与谐波测量法之间切换,能够适应高低湿度环境.在低湿度环境检测中,利用二次谐波与一次谐波的比值来定标湿度,有效去除了光源不稳定对测量带来的影响;过采样的A/D转换结合数字锁相放大(DLIA)技术,提高了检测精度.系统通过以太网接口,可以实现远程数据采集 |
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其他语种文摘
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An undersized humidity detecting system based on infrared spectrum absorption is introduced. A vertical-cavity surface-emitting laser is used as the light source and provides lasers at 1.854 μm which is a main absorption peak of water vapor. To cover all humidity condition, vapor density is detected via two different methods, which are switched by the system automatically depending on measure results. In low-density condition, the ratio of the second-harmonic to fundamental signal is used to eliminate the interference due to light power variation. A/D conversion with over-sampling and digital lock in amplification enhance the accuracy of signal processing, and with IEEE 802.11x protocol, automatic remote data acquisition is achieved |
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来源
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强激光与粒子束
,2011,23(2):363-366 【核心库】
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DOI
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10.3788/hplpb20112302.0363
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关键词
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传感器
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湿度检测
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红外波段光谱吸收
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小型化
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过采样
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数字锁相放大
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地址
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中国科学院半导体研究所, 北京, 100083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4322 |
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学科
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物理学 |
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基金
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公益性行业（气象）科研专项
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国家自然科学基金项目
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文献收藏号
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CSCD:4149651
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