Pitz R W
Appl Opt. 1990 Jun 1;29(16):2418-23. doi: 10.1364/AO.29.002418.
Smoke emission measurement by conventional filtering techniques is inaccurate for low levels of smoke (below ~2 mg/M(3)). Here photothermal deflection spectroscopy (PDS) is used to measure low levels of smoke emitted from a diffusion flame. In the PDS smoke instrument, an argon-ion laser heats the smoke sample and the deflection of a He-Ne laser probe beam is detected by a position sensor. The beam deflection is directly related to the smoke density. Using PDS, smoke emissions from an acetylene flame are detected at levels as low as 50 microg/m(3) (5 x 10(-6) cm(-1) light absorption).
采用传统过滤技术测量低浓度烟雾（低于约2毫克/立方米）时，测量结果不准确。本文采用光热偏转光谱法（PDS）测量扩散火焰中排放的低浓度烟雾。在PDS烟雾测量仪器中，氩离子激光加热烟雾样品，位置传感器检测氦氖激光探测光束的偏转。光束偏转与烟雾密度直接相关。利用PDS，可检测到乙炔火焰排放的低至50微克/立方米（光吸收为5×10⁻⁶厘米⁻¹）的烟雾。
