Leslie D H, Trusty G L
Appl Opt. 1981 Jun 1;20(11):1941-7. doi: 10.1364/AO.20.001941.
Absorption coefficient measurements for trace amounts of methane are reported, in a 1-atm argon balance, at seventeen deuterium-fluoride (DF) laser line frequencies. An optoacoustic detector (spectrophone) operating within the DF laser optical cavity yielded a minimum detectable absorption of 0.007 km(-1) (7 x 10(-8) cm(-1)) for a 10:1 SNR. Results are compared with previous measurements and with calculated absorption coefficients obtained using the AFGL atmospheric absorption parameter compilations. A 2.5-fold increase in agreement results when the 1980 AFGL methane parameters are used instead of the 1978 parameters.
报告了在1个大气压的氩气平衡条件下，在17个氟化氘（DF）激光谱线频率处对痕量甲烷吸收系数的测量结果。在DF激光光学腔内运行的光声探测器（分光话筒）在信噪比为10:1时的最小可探测吸收为0.007 km⁻¹（7×10⁻⁸ cm⁻¹）。将结果与先前的测量结果以及使用空军地球物理实验室（AFGL）大气吸收参数汇编得到的计算吸收系数进行了比较。当使用1980年AFGL甲烷参数而非1978年参数时，吻合结果提高了2.5倍。
