應用繞射光學元件之齒輪量測系統開發;Development of a Gear Measuring System by Diffractive Optical Element Technology

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Title:	應用繞射光學元件之齒輪量測系統開發;Development of a Gear Measuring System by Diffractive Optical Element Technology
Authors:	張軒慈;Chang, Hsuan-Tzu
Contributors:	機械工程學系
Keywords:	齒輪檢測;繞射光學元件;電腦視覺;影像處理;拓樸誤差;Gear measurement;diffractive optical elements (DOEs);computer vision;image processing;error of topography
Date:	2016-11-01
Issue Date:	2017-01-23 17:12:51 (UTC+8)
Publisher:	國立中央大學
Abstract:	傳統齒輪檢測大多使用接觸式探針量測，但接觸式量測方法容易受限於探針尺寸、齒輪材質及量測速度等。因此本研究建立一套新式光學量測方法應用於齒輪檢測，利用雷射光經繞射元件將光點投射至待測齒面，並以感光耦合元件(Charged-coupled device, CCD)擷取其影像進行分析，求得齒面拓樸、齒形與導程誤差。本研究之量測系統利用兩台CCD拍攝校正片之特徵點進行校正，並建立立體空間座標系統，再利用此立體空間座標系統計算雷射光經繞射元件(Diffractive optical elements, DOEs)投射至待測齒面之光點座標值。為驗證系統量測精度，本研究使用三次元量測儀所量數據作為參考值，並以此量測數據建立一曲面，計算光點座標至曲面之正交距離，並且進一步將光點數據建立一曲面與理想齒形進行比對，計算拓樸、齒形與導程誤差。實驗結果顯示，本研究發展之系統其精度達0.0651 mm，驗證此方法應用至三維齒面量測之可行性，未來可藉由改善繞射元件設計及CCD規格，提升量測系統解析度，達到工業使用規格。本論文所發展之檢測系統，利用雷射光搭配繞射元件，藉由CCD取像配合計算電腦視覺與CCD校正參數，可將光點與理想值進行比對後繪出各比對結果並計算其誤差，為一可快速量測齒面誤差之非接觸式光學量測系統。 ;Most of the traditional gear measurements use contact probes, but such contact measurements are restricted by a number of factors, including, but not limited to probe sizes, gear materials and measuring speeds. Therefore, an innovative optical measuring technology is developed by this research for gear measurements, during which, the laser beams are projected to the surface of the gear to be measured by diffractive optical elements (DOEs), while CCDs are used to capture the resulting images for analysis in order to determine the errors for gear topography, tooth profile and lead. The measuring system developed by this study uses the images captured by two CCDs to perform calibrations, alignments and corrections, and a 3D coordinate system is established, from which, the coordinate values for the laser beams projected by the DOEs on the surface of the gear is determined. In order to determine the accuracy of the measuring system developed by this research, the measurement data obtained by 3D measuring devices are used as the reference and its corresponding distribution pattern is established. The perpendicular distance between a coordinate value of laser beam projected on the surface of the gear and the distribution pattern is determined. The distribution pattern of the data generated from such distance determination is established and compared with an ideal distribution in order to determine the errors for gear topology, gear profile and lead. The results of experiments show that the accuracy of the system developed by this research is up to 0.0651mm, which confirms the reliability of the system for 3D gear surface measurement. It is expected further improvement of DOEs and CCDs may enhance the resolution of the measuring system to satisfy the requirements for industrial use. The technology developed by this research is an efficient non-contact optical measurement system for gears, which performs comparisons against ideal values and determine errors by using DOEs, laser projections, the images captures by CCDs, computer vision and the corresponding distribution patterns of data obtained.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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