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MEASUREMENT OF LONG FOCAL-LENGTH BASED ON STRIPE MATCHING

Jia Luo, Jian Bai,Yao Jiang, Fan He, Kaiwei Wang, Xiyun Hou, Changlun Hou
  • Abstract:
    A novel method for accurate long focal-length measurements, based on stripe matching, is proposed. This method consists of a laser source, two gratings and a detector. A divergent beam illuminating two parallel gratings produces moiré fringes on the second grating. Then, added a test lens in front of the first grating, a new moiré fringes is produced. The two moiré fringes are matched by moving the second grating and the corresponding focal-length can be easily obtained by the measurement of the distance between gratings. Experiment demonstrates the proposed method features high accuracy of 0.18% and stability of 0.0004%. Besides, this method tremendously reduces testing time.
  • Keywords:
    long focal-length, measurement, stripe matching, gratings, Moiré fringes
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  • DOI:
    _unreg_tc14-2014.67

Event details:

  • IMEKO TC:
    TC14
  • Event name:
    TC14 LMPMI Symposium 2014
  • Title:

    11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry

  • Place:
    Tsukuba, JAPAN
  • Time:
    03 September 2014 - 05 September 2014