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| Design of Fixed Focus System for Laser Velocimeter |
| LÜ Dan1,LIN Jun1,2,3,ZHOU Jian4 |
1. Fujian Metrology Institute, Fuzhou, Fujian 350003, China
2. Key Laboratory for Fujian Energy Metrology, Fuzhou, Fujian 350003, China
3. National Urban Energy Metrology Center(FJ), Fuzhou, Fujian 350003, China
4. National University of Defense Technology,Changsha, Hunan 410000, China |
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Abstract To meet the speed measurement needs of laser velocimeter in meter level distance, a fixed focus system for laser velocimeter was designed. First, the spot radius at different positions from laser exit were measured by beam profiler, then the waist radius and position of laser beam were got by the function fitting method. The telescope system is used as the basic structure of the fixed focus system, the parameters of fixed focus system were exhausted by MATLAB software, and all the satisfied parameters were recorded. According to the actual conditions, a set of data was chosen to apply to laser velocimeter, the laser spot radius is less than 0.6mm at 4.5m and 5.5m, which matched the expectations.
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Received: 20 December 2019
Published: 20 April 2021
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2021, Vol. 42 
