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
- Download:
- IMEKO-TC14-2014-67.pdf
- DOI:
- -
- 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