Arroyo M P, Hanson R K
Appl Opt. 1993 Oct 20;32(30):6104-16. doi: 10.1364/AO.32.006104.
A tunable diode laser diagnostic based on spectrally resolved laser absorption has been developed to detect water vapor. The system uses a distributed feedback InGaAsP diode laser, emitting at ~ 1.38 µm. The diode laser is tuned in wavelength by modulation of the current, resulting in 1-cm(-1) tuning at 80-Hz repetition rate. The directly measured absorption spectra yield values for water-vapor concentration and temperature, as well as a collision-broadening line shape. To our knowledge, we accurately determined required data for H(2)O line strengths and self-broadening coefficients for several spectral lines in a static cell filled with pure water vapor. The temperature and concentration of the water vapor present in laboratory room air and in the postflame gases above a methane-air flat flame burner have also been measured. These results agree well with calculated values and independent measurements.
已开发出一种基于光谱分辨激光吸收的可调谐二极管激光诊断技术来检测水蒸气。该系统使用分布式反馈 InGaAsP 二极管激光器，发射波长约为 1.38 µm。通过调制电流对二极管激光器进行波长调谐，在 80 Hz 的重复频率下实现 1 cm⁻¹ 的调谐。直接测量的吸收光谱可得出水蒸气浓度、温度以及碰撞展宽线形状的值。据我们所知，我们在充满纯水蒸气的静态池中准确测定了几条谱线的 H₂O 谱线强度和自展宽系数所需的数据。还测量了实验室室内空气中以及甲烷 - 空气平板火焰燃烧器上方火焰后气体中存在的水蒸气的温度和浓度。这些结果与计算值和独立测量结果吻合良好。
