Abstract
An emission-controlled feedback system for stabilizing an ICP has been investigated. Unlike previous stabilization methods which monitor only the power being sent to the plasma, the present one uses an emission signal from either argon or an internal reference element as a stability indicator. Using a previously constructed power-modulation circuit for rf power control, the feedback network adjusts the plasma power to compensate for changes in the emission level of the reference element. It is shown to be particularly useful for reducing or eliminating the drift that occurs when the plasma is warming up. A key point for successful operation of the feedback arrangement is that both the feedback-signal and the analysis photometric systems must receive light from exactly the same region of the plasma. Also, the excitation energy and ionization characteristics of the reference element should be comparable to those of the desired analyte. Results with several combinations of argon, barium, calcium, iron, manganese, sodium, and strontium lines are presented.
PDF Article
More Like This
Propagation characteristics of terahertz wave in inductively coupled plasma
Jinhai Sun, Yan Zheng, Jielin Shi, Yarui Zhao, Yu Li, Ding Wu, He Cai, Xutao Zhang, Xianli Zhu, Yongqiang Liu, Xinxue Sun, Zengming Chao, Hongcheng Yin, Wenqi Lu, and Hongbin Ding
Opt. Express 29(22) 35837-35847 (2021)
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription