靶埸物體存在之光電檢測技術

Abstract

本論文旨在介紹一特殊測距系統。此系統配備有光學系統、 紅外線發光二極體之光源、CIS(contact image sensor)感測元件 、及信號處理電路。藉光學三角測距法偵測近距離目標物之距離來判 斷此物體是否存在於靶埸之中。本系統最大之優點為低成本、體 積小而且信號處理採用數位方式，有效降低信號處理程序之複雜 度。在系統架構同時使用光學成像法縮小光束寬度及利用直式測 距方式減低光源光束寬度效應(beam size effect)之影響，提高偵測 的正確性。實驗結果證明本系統確能達到偵測物體存在之目的

A special range-finding system basing upon the triangular ranging principle has been constructed. It equips with an optical system, a contact image sensor, and a signal processing circuit. The advantage of contact image sensor is low cost and easy to control, so we can simplify the signal processing circuit. In the measurement system, both of optical imaging method and vertical range-finding method are adopted to reduce the influence of beam size effect. This doing can improve the object detection. The results show that the system can effectively detect the object existing in a defined field.