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《Acta Geodaetica Et Cartographic Sinica》 1984-04
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RESEARCH ON THE OPTIMUM VALUE OF FREQUENCYDERIATION IN THE ELECTRO-OPTICAL DISTANCEMEASURING INSTRUMENT WITH UHF MODULATION

Chen Changhao(Institute of Seismology. State Seismological Bureau)  
This paper presents a description of the principle of the synchronous detection method which is particularly suitable for phase detection in electro-optical distance measuring instrument with UHF modulation. Also described is the computation method of the optimum value of frequency deviation selected for increasing the sensitivity of phase detection. These methods make the overall design of the instrument ensure theoretically the accuracy of phase detection and provide a theoretical basis for analysing the sensitivity of the instrument of phase type with UHF modulation. Finally, a comparison with the values provided by specifications of ME3000 and English two-colour EDM instrument has proved the correctness of this computation method.
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【References】
Chinese Journal Full-text Database 2 Hits
1 Wu Guoyong (Institute of Seismology, State Seismological Bureau);INSPECTION AND MAINTENANCE TECHNIQUE OF HIGHPRECISE MEKOMETER ME-3000[J];Crustal Deformation and Earthquake;1987-03
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
【Co-references】
Chinese Journal Full-text Database 1 Hits
1 Huang Ruiguang(Institute of Seismology. State Seismological Bureau);MEASURING PHASE DELAY WITH VARIABLE LIGHT-PATHOF HIGH PRECISION LIGHT WAVE RANGEFINDER[J];Acta Geodaetica Et Cartographic Sinica;1984-04
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