Title: High precision measuring method and device for laser cavity change displacement and refractive index
Application Number: 93114899 Application Date: 1993.11.26
Publication Number: 1103161 Publication Date: 1995.05.31
Approval Pub. Date: Granted Pub. Date: 2000.01.19
International Classifi-cation: G01B11/02,G01N21/41
Applicant(s) Name: Qinghua Univ., Qinghua Univ. Address: 100084
Inventor(s) Name: Zhang Shulian, Jin Guofan, Zhang Shulian
Attorney & Agent: LIAO YUANQIU
Abstract:
     The present invention utilizes the phenomena of Lamb subsideness, mode changing subsideness and the frequency splitting varation in the output power caused by the optical path difference in the chamber of helium neon laser or the chamber length variation to measure the number of subsideness appeared in the autput power through fixing the measured matter and chamber reflector in same place or variation of ratio of air refraction caused in the chamber, then the displacement of the measured matter or the varied value of ratio of refraction in chamber can be obtained. The advantages are simple structure of implementing device, low cost, easy to assemble and adjust and higha ccuracy of measurement and suitable for measuring the displacement and ratio of refraction of air in various occasions.
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