Author Affiliations
Abstract
1 School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2 Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
3 School of Electrical Engineering & Telecommunications, University of New South Wales, NSW 2052, Australia
We propose a new non-intrusive flow measurement method using the distributed feedback fiber laser (DFB-FL) as a sensor to monitor flow in the pipe. The relationship between the wavelength of the DFB-FL and the liquid flow rate in the pipeline is derived. Under the guidance of this theory, the design and test of the flow sensor is completed. The response curve is relatively flat in the frequency range of 10 Hz to 500 Hz, and the response of the flow sensor has high linearity. The flow from 0.6 m3/h to 25.5 m3/h is accurately measured under the energy analysis method in different frequency intervals. A minimum flow rate of 0.046 m/s is achieved. The experimental results demonstrate the feasibility of the new non-intrusive flow measurement method based on the DFB-FL and accurate measurement of small flow rates.
DFB-FL flow non-intrusive measurement energy analysis frequency interval Chinese Optics Letters
2020, 18(2): 021204
天津大学精密测试技术及仪器国家重点实验室， 天津 300072
针对范围在十几米至几十米、法向矢量变化大的复杂曲面测量问题，提出一种无干扰精密测量方法。通过光学投射的方法设置测量点和全局控制点，利用定向相机结合固定于测量相机上的定向靶标，解决测量相机初始位置姿态估计问题，进而利用光束平差优化方法解算被测点精确的空间三维坐标。克服了现有方法中必须在被测表面设置编码特征的局限，快速、有效且不会干扰被测曲面。实验表明：原理方法可靠，测量数据总体均方根误差为0.07 mm，能够高精度、高效率地解决大型空间复杂曲面的无干扰精密测量问题。
光学测量 三维形貌精密测量 无干扰测量 大型空间曲面 定向相机 定向靶标
