Abstract
This report describes an optical sensing system for fine particle detection using a combination of two techniques: laser-induced breakdown spectroscopy (LIBS) and laserinduced incandescence (LII). We have improved laser measurement systems applied for small-particle analysis. We have determined elemental composition and density of particles using LIBS and have been able to measure particle size using LII. Controlling the power density of the light source of the present system allowed switching from LIBS to LII. LII temporal analysis was conducted using a streak camera, which was also used for LIBS analysis. The LII technique allows in situ measurement of the average primary particle size of nanoscale soot particles.
Highlights
Sensors and Materials, Vol 25, No 1 (2013)region of the lungs
The size evaluation was carried out using the laserinduced incandescence (LII) technique, while atomic signals of carbon were obtained using the Laser-induced breakdown spectroscopy (LIBS) technique with the same measurement system
The combined LII and LIBS system will help elucidate the role of the oxygen density and the hydrocarbon content in wax in the soot agglomeration process
Summary
Sensors and Materials, Vol 25, No 1 (2013)region of the lungs. Using existing technologies, it is difficult to analyze (in real time) the size and composition of fine particles over a broad range of conformational space in the atmosphere.Laser-induced breakdown spectroscopy (LIBS) is a useful tool for determining the elemental composition of various materials and does not require any preprocessing. Sensors and Materials, Vol 25, No 1 (2013). It is difficult to analyze (in real time) the size and composition of fine particles over a broad range of conformational space in the atmosphere. Laser-induced breakdown spectroscopy (LIBS) is a useful tool for determining the elemental composition of various materials and does not require any preprocessing. It is not possible to obtain particle size information using the LIBS technique alone. Optical microscopes or scanning electrical microscopes (SEMs) have been used to observe the size and shape of particles; a particle size classification apparatus with a laser has traditionally been used to monitor the size and distribution of suspended particles
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