High-sensitivity boron nitride sputter erosion measurements by continuous-wave cavity ring-down spectroscopy

Azer P. Yalin, Lei Tao, Ryan Sullenberger, Masashi Oya, Naoji Yamamoto, Timothy B. Smith, Alec D. Gallimore

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Sputter erosion of boron nitride (BN) plays a key life-limiting role in many Hall thrusters. We report on the development of cavity ring-down spectroscopy (CRDS) as a sensitive and accelerated diagnostic for sputter erosion. The measurement approach is based upon probing sputtered boron atoms in the region of 250 nm. We present quantitative detection of sputtered BN using CRDS with a pulsed laser source. The pulsed measurement results are compared with modeled signal levels. We update the development of a continuous-wave CRDS system using the frequency-quadrupled output of an external cavity diode laser as the light source. Characterizations of the measurement sensitivity show that with integration times of several minutes, the current performance would allow high signal-to-noise erosion measurements for expected thruster conditions. Approaches to increase sensitivity (reduce measurement time) and to integrate with vacuum chambers for thruster testing are summarized.

Original languageEnglish
Title of host publication44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Publication statusPublished - 2008
Event44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit - Hartford, CT, United States
Duration: Jul 21 2008Jul 23 2008

Publication series

Name44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

Other

Other44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
CountryUnited States
CityHartford, CT
Period7/21/087/23/08

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Control and Systems Engineering
  • Space and Planetary Science
  • Energy(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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