Laser spark emission spectroscopy for in-situ, real-time monitoring of pulverized coal particle composition

Autor:	J. F. Burrows, David K. Ottesen, L. J. Radziemski, Larry L. Baxter
Rok vydání:	1991
Předmět:	Spectrometer Chemistry Scanning electron microscope General Chemical Engineering Atomic emission spectroscopy Analytical chemistry Energy Engineering and Power Technology Plasma Laser law.invention Fuel Technology Spark ionization law Emission spectrum Laser-induced breakdown spectroscopy
Zdroj:	Energy & Fuels. 5:304-312
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef00026a014
Popis:	Laser spark emission spectroscopy is used to characterize individual coal particles in flowing environments. A high-energy, pulsed Nd:YAG laser is employed to rapidly heat particles forming an ionized plasma. After a delay of 1μs, most of the atomic species are in the neutrak or singly ionized state, and their characteristic line emission spectra are detected by using a spectrometer equipped with a time-gated diode-array detector. Nearly all of the inorganic constituents present in coal above a concentration of 100ppm are observed in the laser spark emission from single particles. Several aspects of the technique are discussed: (1) the plasma excitation process; (2) experimental intensities and methods of calculating elemental composition; and (3) the comparison of particle-by-particle results with average bulk chemical analyses and scanning electron microscopy data
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::17135834d2db12e202ac8d02628b17a2 https://doi.org/10.1021/ef00026a014 Zobrazit plný text záznamu