发表机构
Nicolaus Copernicus University in Toruń; Central Office of Measures（托伦哥白尼大学; 中央计量局）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究开发基于系统级检测传递函数的方法，校正CRDS的仪器畸变，将其精度提升41-87倍至千分之一级，使基准级光谱测量更易普及。
AI 中文摘要
腔衰荡光谱技术（CRDS）广泛应用于高灵敏度光学吸收测量，但其定量精度受CRDS检测系统产生的系统误差限制，误差水平约为百分之几，尤其在短衰荡时间下更为明显。这些限制会影响需要千分之一级精度的严苛光谱应用，包括大气传感、从头算理论检验、基础物理研究以及基于量子的光学气体标准等。本研究开发了一种基于系统级检测传递函数的方法，该函数描述了完整CRDS检测系统的响应，涵盖探测器、电子设备和数字化阶段，并利用该方法校正了此前未被考虑的仪器畸变对提取吸收值的影响。我们使用多种独立CRDS检测配置，对测量至极短衰荡时间的CO吸收线进行了方法验证，这些配置最初表现出高达14%的线面积偏差。应用传递函数校正后，所有系统均收敛至同一数值，相对于最准确的从头算验证参考数据的偏差达到千分之一级，精度提升了41至87倍。该研究提出的框架无需专门测量方案或外部校准标准，即可将成熟的CRDS提升至最准确参考方法的水平，使基准级测量更易普及。
英文摘要
Cavity ring-down spectroscopy (CRDS) is widely used for sensitive optical absorption measurements, but its quantitative accuracy can be limited at the few-percent level by systematic distortions originating in the CRDS detection system, particularly at short ring-down times. These limitations can restrict demanding spectroscopic applications requiring sub-permille accuracy, including atmospheric sensing, tests of ab initio theory and fundamental physics, and quantum-based optical gas standards. Here we develop a methodology based on a system-level detection transfer function describing the complete CRDS detection-system response, including detector, electronics, and digitization stages, and use it to correct previously unaccounted-for instrumental distortions in retrieved absorption. We demonstrate the method on a CO absorption line measured down to very short ring-down times using multiple independent CRDS detection configurations, initially exhibiting line-area biases of up to 14%. After applying the transfer-function correction, all systems converge to a common value, with the bias relative to the most accurate ab initio-validated reference data reaching the sub-permille level and the accuracy improving by a factor of 41--87. The proposed framework brings well-established CRDS to the level of the most accurate reference methods without requiring specialized measurement schemes or external calibration standards, making benchmark-quality measurements more widely accessible.
Comments9 pages, 6 figures
