Lin Y.,Xiamen University |
Lin Y.,Fujian Engineering Research Center for Solid State Lighting |
Ye L.-W.,Xiamen University |
Ye L.-W.,Fujian Engineering Research Center for Solid State Lighting |
And 8 more authors.
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2010
Correlated color temperature (CCT) is one of the important physical parameters to describe light sources and luminous properties of other objects. Based on the definitions of CCT and the discussion of three classic calculating methods of CCT, an equal-interval method for optimizing CCT calculation is proposed. Comparing the results of these above-mentioned methods by MATLAB, it is proved the newly proposed method improves the accuracy as well as the speed of the CCT calculation.
Liu H.,Fujian Engineering Research Center for Solid State Lighting |
Bao L.,Fujian Engineering Research Center for Solid State Lighting |
Chen Q.,CAS Shanghai Institute of Technical Physics |
Chen Z.,Fujian Engineering Research Center for Solid State Lighting
Optics and Laser Technology | Year: 2011
The Fengyun-2 (FY-2) meteorological satellite uses a one-dimensional dynamic angular measuring system to evaluate the stepping accuracy of the scanning mirror. The basic principle of this angular measurement is detecting the light-spot position displacement using a linear charge-coupled device (CCD). This paper presents the design of this non-contact and non-destructive measuring system. To achieve high repeatability and accuracy the centroid method is employed to estimate the light-spot energy gravity, with 20-segment polygonal approximations as a nonlinear compensation. Experimental results show that the measurement system can achieve dynamic angular measurement with up to ±5″ accuracy and 3.5″ repeatability, which makes a credible evaluation for the scanning mirror of FY-2 meteorological satellite. © 2011 Elsevier Ltd. All rights reserved.