Phase-sensitive total-internal-reflection sensing system for measuring vacuum pressure

Ken Huan Chiang, Meng Chang Hsieh, Jiun You Lin

Research output: Contribution to journalArticle

Abstract

Based on the principle of Chiu et al., this work proposes a phase-sensitive total-internal-reflection (TIR) sensing system for measuring vacuum pressure. In the system, linearly polarized light propagates through a specially-designed phase-sensitive TIR apparatus composed of a wave-plate type phase shifter, an isosceles right-angle prism combined with a vacuum cavity, and an analyzer. Under the suitable axis azimuth of the wave plates and the analyzer, it can raise the phase difference of the s- and p- polarization states of the totally-reflected light beam from the TIR apparatus. The raised phase difference is related to the vacuum pressure; therefore the pressure is easily and accurately determinable with measuring the phase difference variation using the heterodyne phase-detection technique. The experimental results demonstrated the feasibility of this method. Measurement resolution and sensitivity levels superior to 0.4 torr and 0.02°/torr were respectively attainable in measurement region of 10 torr to 760 torr.

Original languageEnglish
Pages (from-to)508-513
Number of pages6
JournalOptics and Laser Technology
Volume115
DOIs
Publication statusPublished - 2019 Jul

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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