中国物理B ›› 2015, Vol. 24 ›› Issue (7): 75205-075205.doi: 10.1088/1674-1056/24/7/075205

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Using a Mach–Zehnder interferometer to deduce nitrogen density mapping

F. Boudaoud, M. Lemerini   

  1. Department of Physics, University Abou Bekr Belkaid, Tlemcen, Algeria
  • 收稿日期:2014-12-05 修回日期:2015-02-16 出版日期:2015-07-05 发布日期:2015-07-05

Using a Mach–Zehnder interferometer to deduce nitrogen density mapping

F. Boudaoud, M. Lemerini   

  1. Department of Physics, University Abou Bekr Belkaid, Tlemcen, Algeria
  • Received:2014-12-05 Revised:2015-02-16 Online:2015-07-05 Published:2015-07-05
  • Contact: F. Boudaoud E-mail:fethiaboudaoud@yahoo.fr

摘要: This work presents an optical method using the Mach–Zehnder interferometer. We especially diagnose a pure nitrogen gas subjected to a point to plane corona discharge, and visualize the density spatial map. The interelectrode distance equals 6 mm and the variation of the optical path has been measured at different pressures: 220 Torr, 400 Torr, and 760 Torr. The interferograms are recorded with a CCD camera, and the numerical analysis of these interferograms is assured by the inverse Abel transformation. The nitrogen density is extracted through the Gladstone–Dale relation. The obtained results are in close agreement with values available in the literature.

关键词: Mach-Zehnder interferometer, Gladstone-Dale equation, Abel inversion, corona discharge

Abstract: This work presents an optical method using the Mach–Zehnder interferometer. We especially diagnose a pure nitrogen gas subjected to a point to plane corona discharge, and visualize the density spatial map. The interelectrode distance equals 6 mm and the variation of the optical path has been measured at different pressures: 220 Torr, 400 Torr, and 760 Torr. The interferograms are recorded with a CCD camera, and the numerical analysis of these interferograms is assured by the inverse Abel transformation. The nitrogen density is extracted through the Gladstone–Dale relation. The obtained results are in close agreement with values available in the literature.

Key words: Mach-Zehnder interferometer, Gladstone-Dale equation, Abel inversion, corona discharge

中图分类号:  (Plasma diagnostic techniques and instrumentation)

  • 52.70.-m
52.38.-r (Laser-plasma interactions) 42.40.Kw (Holographic interferometry; other holographic techniques) 42.30.-d (Imaging and optical processing)