High Precision On-line Optical Fiber Measurement System

High-precision online measurement plays an important role in the manufacturing optical fiber devices,The measurement accuracy determines the maximum output power of the fiber laser and the performance of the fiber sensor.How to improve the accuracy and speed of the measurement system has become the research hotspots However,the traditional methods have the problems of low measurement accuracy,poor stability and slow measurement speed.In order to solve the shortcomings of traditional methods,this paper uses image processing technology to design a fiber measurement experimental device,which aims to improve the accuracy,range and speed of fiber measurement.The main work of this paper is to develop a system to meet the needs of optical fiber process measurement.The article first introduces the background and significance of the research,investigates the current status of key technology research in visual measurement field,and then designs a visual measurement experimental device based on the characteristics of optical fiber structure At the same time,combined with imaging theory and simulation calculations,the best optical fiber imaging system is proposed.According to the designed measurement system,combined with the optical fiber processing platform and different optical fiber image characteristics,improved sub-pixel edge detection algorithms and optical fiber diameter stitching algorithms have been developed.Finally,we used this software to carry out measurement experiments.The main work and conclusions are as follows:(1)An optical fiber imaging model is established,and the simulation and experiment are compared and analyzed.The results show that as the backlight illumination distance increases,the contrast of the fiber cladding image increases.If the illumination backlight is closer to the fiber,the bright area in the middle of the fiber image will increase,which is beneficial to the imaging of the fiber core.(2)The characteristics of the optical fiber structure are analyzed,combined with imaging theory and simulation calculations,the optimal imaging conditions of the optical fiber core and cladding are obtained.Thus,the adjustment speed of the optical fiber imaging system is improved.(3)When processing fiber images,the improved sub-pixel edge detection algorithm can meet the accurate extraction of fiber edges of different resolutions and different frequencies,thereby improving the fiber detection accuracy,and at the same time expanding the sub-pixel edge detection algorithm in different resolution fibers image application.(4)In order to measure the overall diameter of fused tapered fiber,this paper proposes an optical fiber diameter splicing algorithm.Experimental results show that this algorithm can obtain the overall shape of the tapered fiber.(5)Combining the imaging principle,an image super-resolution algorithm based on image deconvolution reconstruction is proposed.And verify the results in the actual resolution test card.The results show that the image resolution can be improved,but there is a problem of zero oscillation.(6)We use Lab VIEW and Matlab mixed programming to develop optical fiber measurement software,which has achieved a variety of optical fiber online measurement tasks,met the process measurement requirements,and improved measurement accuracy and robustness.