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題名 | A Research on Photorefractive Crystal-based IR Optical Modulation=光折射性晶體應用於紅外光調變之研究 |
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作者姓名(中文) | 林煒鋒; 汪啟茂; | 書刊名 | 筧橋學報 |
卷期 | 4 1997.09[民86.09] |
頁次 | 頁17-24 |
分類號 | 448.5 |
關鍵詞 | 光折射性晶體聯想記憶體; 光標; 紅外光學調變; 全像圖; 聯想記憶體; 神經網路; Photorefractive crystal associative memory; PRAM; Reticle; Infrared optical modulation; Hologram; Associative memory; Neural network; |
語文 | 英文(English) |
中文摘要 | 對方向性紅外訊號之追蹤及背景雜訊之去除,利用紅外光學調變(光標或光斧)為 一極佳之方法。建立於透明底質中之目標明暗相間圖像,可藉光標循目標中心旋轉,而使原 具直流性值之目標訊號被編碼為交流訊號。由於光折射性晶體 (Photorefractive crystal, PR crystal) 具備折射特性,故可作為光學聯想記憶體 (Optical associative memory) 之 元件。而其重點則在於如何將此元件應用於紅外光學訊號調變技術中。本計畫即提出使用光 折射性晶體聯想記憶體技術以替代傳統使用之光標作紅外光學訊號變之應用研究。本文中, 除對紅外光訊號追蹤,提供一直接有效且便利之方法外,並可藉光訊號處理及類神經網路理 論之使用,將紅外系統背景幅射所產生之雜訊予以抑制。 |
英文摘要 | An Infrared optical modulation (reticle or chopper) is used to provide directional information of infrared system for tracking and suppress the unwanted signals from backgrounds. It is constructed by a pattern of alternately clear and opaque areas carried on a transparent substrate. When the reticle is rotating, the pattern wll code the radiant flux with the information about the direction of target. Therefore, the D.C. target signal will be changed into the A.C. target signal when the reticle is rotated about the center of the pattern. In this paper an infrared optical modulation using Photorefractive crystal associative memory (PRAM) technique will be studied. We will use PRAM to replace the optical modulator (reticle). A photorefractive crystal can be a new kind of optical associative memory. The basic ideal is centered on how to use this new optical associative memory. |
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