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題 名 | A Multispectral Imaging Spectrometer with Programmable Wavebands=可選擇頻帶之多頻帶譜像儀 |
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作 者 | 林巍聳; 黃奇沛; 蘇怡仁; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 21:5 1997.09[民86.09] |
頁 次 | 頁416-427 |
分類號 | 448.5 |
關鍵詞 | 多頻帶譜像儀; Imaging spectrometer; Spectral signature; Remote sensing; |
語 文 | 英文(English) |
中文摘要 | 偵測實物樣本的頻譜特性,是選定遙測頻帶與判讀遙測結果所必須的。 針對這個 目的,本研究發展出一套可因應不同的應用需求、調整偵測頻帶數目與帶寬的多頻帶譜像儀 ,實際製作完成的多頻帶譜像儀,可以偵測 400 奈米( nm )到 900 奈米的波長,涵括可 見光與近紅外光的範圍,也涵括未來中華一號衛星上,海洋水色儀的所有六個頻帶。本多頻 帶譜像儀, 用一個平面型電藕合感測器( CCD )、一個十六位元類比數位轉換器、以及推 掃機制( pushbroom ), 構成強度、波長、影像長、影像寬等四度空間的偵測與顯像機能 ,應用的極限, 可以達到 1024 個偵測頻帶、0.1 奈米的帶寬、16 位元的強度解析能力、 10 平方厘米的偵測面積, 整個系統主要包括分光器、電藉合感測器、白光源、線型平台、 處理機等五個硬件,其整合操作與偵測、攝像,均由一套作業軟體自動負責監控,所取得的 頻譜數據,可以立即顯像,也可以儲存起來,以供後續研究之用。顯像時,可以選用灰階、 十六色、或紅綠藍假色以加強效果。為測試與展現本多頻帶譜像儀的性能,論文中詳實的記 錄了一個幾何樣本和一個樹葉樣本的譜像偵測結果,其中也有用海洋水色儀的六個頻帶所偵 測得的譜像。 |
英文摘要 | Investigation of the spectral signatures of real objects in the field can aid selection of wavebands for remote sensing experiments and can facilitate interpretation of the results. This research focused on developing a multispectral imaging spectrometer for this purpose. The implemented spectral range of detection is from 400 nm to 900 nm, covering visible and near infrared light. To allow freedom in choosing the bandwidths and number of wavebands for various applications, the wavebands are made programmable. An area CCD (Charge Coupled Device) detector with 256 × 1024 pixels, a 16-bit analog to digital converter, and a pushbroom scanning mechanism enable the system to detect the radiance of an object in one intensive, one spectral and two spatial dimensions. In the extreme case of imaging, 1024 wavebands, 0.1 nm bandwidth, 16-bit resolution of intensity, and a 10 cm square footprint on the object plane can be achieved. The hardware consists of a monochromator, an CCD camera, a light source, an X-stage and a processing unit, which are successfully integrated to perform spectral imaging functions. During operation, the system is supervised by operating software, which is designed to automate the imaging procedures. The resulting spectral data can be saved on a hard disk for further study. For immediate display of the spectral images, gray-scale, 16-color and artificial RGB-color schemes are provided to enhance the presentation. For the sake of testing and demonstration, the spectral characteristics of a geometric pattern and a leaf samples have been investigated by using this imaging spectrometer. Its capability in observing objects using six OCI wavebands has been demonstrated as well. The results show that the goal of the design has been successfully implemented. |
本系統中英文摘要資訊取自各篇刊載內容。