[1-5] from the case using coherent light source to the case using incoherent source (i. e., extended non-monochromatic light source). The formulas of the principle of measurement and the schematic diagram of the measuring device are presented."/>     "CORE RING-RATIO" METHOD FOR SURFACE ROUGHNESS MEASUREMENT WITH INCOHERENT LIGHT SOURCE
Acta Physica Sinica
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Acta Phys. Sin.  1990, Vol. 39 Issue (1): 10-17    
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"CORE RING-RATIO" METHOD FOR SURFACE ROUGHNESS MEASUREMENT WITH INCOHERENT LIGHT SOURCE
CHENG LU1, SIU GUEI-GU2
(1)南开大学物理系,天津,300071; (2)香港城市理工学院应用科学系
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