Kim J W, Yoo Y S, Lee J Y, Lee J B, Hahn J W
Appl Opt. 2001 Oct 20;40(30):5509-16. doi: 10.1364/ao.40.005509.
To evaluate the uncertainty of concentration measurement using cavity ringdown spectroscopy, we analytically derived expressions for uncertainty for parameters, such as temperature, laser frequency, and ringdown time deviation, from the model equation. The uncertainties that are due to systematic errors in a practical cavity ringdown system were assessed through an experimental study of the PQ(35) transition in an A band of molecular oxygen. We found that, except for the line strength that is regarded as a reference value independent of the measurement, the laser frequency jitter is the largest uncertainty source in the system. Some practical requirements for minimizing the uncertainty in concentration measurements are discussed. We also demonstrated determination of the line strength of the PQ(35) transition line of oxygen to be 8.63(3) x 10(-27) cm(-1) with a relative uncertainty of less than 0.4%.
为了评估使用光腔衰荡光谱法进行浓度测量的不确定度，我们从模型方程中解析推导了诸如温度、激光频率和衰荡时间偏差等参数不确定度的表达式。通过对分子氧A带中PQ(35)跃迁的实验研究，评估了实际光腔衰荡系统中系统误差导致的不确定度。我们发现，除了被视为与测量无关的参考值的谱线强度外，激光频率抖动是系统中最大的不确定度来源。讨论了最小化浓度测量不确定度的一些实际要求。我们还证明了氧的PQ(35)跃迁线的谱线强度测定值为8.63(3)×10⁻²⁷ cm⁻¹，相对不确定度小于0.4%。
