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《Acta Geodaetica Et Cartographic Sinica》 1984-04
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Huang Ruiguang(Institute of Seismology. State Seismological Bureau)  
Based on the relation that the light intensity I, obtained when a light travels and returns through modulation crystals having pokle's effect is a periodic function of distance D, this paper introduces the principle of measuring phase delay with variable light-path. Taking for example the variable light-path by using optical incremental circle as shift sensor, this paper discusses the design principel and derives a system of practical equations to evaluate measuring distance under the condition of setting up frequency with indirect decimal system and replacing measuring phase with measuring length. Also introduced are logical circuits for parforming mathematical calculation and linking up the five equations.
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Chinese Journal Full-text Database 2 Hits
1 Wang Jianhua (Instittute of Seismology, State Seismological Bureau);SYNCHRONOUS AND DELAY PHOTODETECTION IN THE HIGH-PRECISION LASER GEODIMETER[J];Crustal Deformation and Earthquake;1987-02
2 Ni Huanmin Chen Changhao (Institute of Seismology, State Seismological Bureau) L. E. Slate (CIRES University of Colorado USA);SYNCHRONOUS DETECTION WITH THE PHASE SHIFT IN THE LIGHT WAVE DISTANCE MEASURING INSTRUMENT WITH UHF MODULATION[J];Crustal Deformation and Earthquake;1989-03
Chinese Journal Full-text Database 1 Hits
1 Chen Changhao(Institute of Seismology. State Seismological Bureau);RESEARCH ON THE OPTIMUM VALUE OF FREQUENCYDERIATION IN THE ELECTRO-OPTICAL DISTANCEMEASURING INSTRUMENT WITH UHF MODULATION[J];Acta Geodaetica Et Cartographic Sinica;1984-04
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