本論文以設計與製造三維數位化量測儀為研究目的，該儀器具備四種主要功能：(1)逐層移除待測物材料，(2)對待測物各層斷面進行取像，(3)將所得影像進行二值化、尋邊與分割影像處理，(4)堆疊處理後的影像以重建三維CAD模型。透過三維數位化量測儀可取得待測物內部特徵資料並轉換為三維CAD模型。

本研究首先挑選適當的加工機，並選用相關硬體，如儀控電腦、步進馬達、CCD攝影機、鏡頭、補光燈、空壓元件、防塵罩。接著分為兩部分，一部分為馬達連接法蘭、影像系統固定架機構設計與製作，並架設馬達與CCD攝影機以達到自動化控制移動平台與影像擷取的功能。另一部分為光學尺讀取回授訊號、步進馬達控制與CCD攝影機影像擷取程式的設計，以LabVIEW作為程式語言。當所有軟硬體完成後進行量測儀性能分析與實例應用。

由性能分析結果得知，本研究之三維數位化量測儀的最大工作空間為245×105×70 mm，準確度為0.029 mm，控制解析度為0.005 mm，精密度為0.026 mm，逐層加工進給厚度為0.005 mm，影像系統為79萬像素。Gage R&R百分比為25.99%，其中重現性百分比為5.37%，此部份可持續研究改善。

The objective of this thesis is to design and fabricate a 3D digitizer, which has four main functions: (1) removing material of the part layer by layer, (2) capturing cross-sectional images of the part, (3) applying the image processing techniques (threshold, edge detection and segment) to the captured images, (4) stacking the processed images and rebuilding a CAD model. Using the 3D digitizer, users can obtain the inner and outer structure of a part under inspection and rebuild its CAD model.

To achieve the goal, a proper machine tool and related hardware were selected first, such as an instrument-control computer, stepping motors, a CCD camera, lens, a circular LED light, an air unit and a dust cover. Next, motor adaptor flanges, a fixture of imaging system, and a air unit were designed and fabricated. Then the motors to control moving stage and a CCD camera to capture images were installed. Then the software for linear scale signal feedback, stepping motor motion control and image capturing was developed by using LabVIEW. Finally, a performance analysis was conducted and the applications of 3D digitizer were studied.

From the result of the performance analysis, it was obtainedthat the maximum working space is 245×105×70 mm, the accuracy is 0.029 mm, the resolution is 0.005 mm, the precision is 0.026 mm and the minimum layer thickness is 0.005 mm. The Gage R&R percentage of the 3D digitizer is 25.99%, in which the reproducibility percentage is 5.37%. The performance of 3D digitizer can be further improved by continuing researches.

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