This article carried theoretical analysis and experimental research on the scheme of remote sensing the minimum detection limit concentration for methane gas using a single laser source. In this project, the frequency-modulation ( FM ) and harmonic detection ( HD ) technologies are adopted. 对一种使用单一激光源遥感检测甲烷方案的最低可探测的路径-积分浓度进行了理论分析和实验研究,该方案主要采用了频率调制及谐波探测技术。
Conclusion : The minimum detection limit of Salmonella in cosmetics contained antiseptic was 2.9 ~ 9.4 × 10 ~ 1 cfu / 10 g by present improved methods. 结论:目前改进的方法对含防腐剂化妆品中沙门菌的最低检出限为2.9~9.4×101cfu/10g。
It is obtained through the theoretical calculation that the minimum detection limit concentration for methane gas was about ( 8.7 × 10 ~ ( - 8 ) m. ) 通过理论计算得出了最低可探测甲烷的路径-积分浓度大约为8.7×10-8m。得到Cr的最低可测浓度为2ppb。
The minimum amount of detection was 1.3 ng. The detectable limit of concentration was 0.08mg/kg in tobacco and soil. 方法的最小检出量为1.3ng,病氰硝在烟草及土壤中的最低检测浓度均为0.08mg/kg。