Influence of ambient conditions on the laser air spark
Yükleniyor...
Dosyalar
Tarih
1999
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Verlag
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
To understand the capability of laser spark spectroscopy or laser-induced breakdown spectroscopy (LIBS) for quantitative, in situ metals measurements in air, we examined the effects of ambient conditions on the laser air spark. We used measurements of light emission to determine temporally- and spatially-resolved values of the plasma temperature and electron density at atmospheric pressure. Many of these measurements were Abel-inverted to determine non-path-integrated values. Electron densities were obtained from Stark-broadened lineshapes. Temperatures were determined using a multi-line graphical Saha-Boltzmann approach. Good agreement was found between electron densities measured using different atoms and emitted lines, between temperatures measured using different elements, and between ionization and excitation temperatures for those elements. Changing the ambient gas, the laser energy, particulate levels, and humidity levels produces little variation in the temperature and electron density in the laser spark. These results are confirmed by the laser-supported radiation wave model for the radiative expansion of the laser spark. This lack of sensitivity of the laser spark characteristics on ambient conditions or laser energy is encouraging for the quantitative use of LIBS.
Açıklama
Anahtar Kelimeler
Laser Air Spark, Laser Spark Spectroscopy, Spectroscopy
Kaynak
Applied Physics B-Lasers And Optics
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
68
Sayı
1
