• 作者： 林巍聳; 黃奇沛; 蘇怡仁
• 作者服務機構： 國立台灣大學電機工程研究所
• 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、電藕合感測器、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 wavebandsfor remote sensing experiments and can facilitate interpretation of the results. This research focused ondeveloping a multispectral imaging spectrometer for this purpose. The implemented spectral range ofdetection is from 400 nm to 900 nm, covering visible and near infrared light. To allow freedom in choosingthe bandwidths and number of wavebands for various applications, the wavebands are made programmable.An area CCD (Charge Coupled Device) detector with 256x1024 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. Thehardware 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 issupervised by operating software, which is designed to automate the imaging procedures. The resultingspectral 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 thesake of testing and demonstration, the spectral characteristics of a geometric pattern and a leaf sampleshave been investigated by using this imaging spectrometer. Its capability in observing objects using sixOCI wavebands has been demonstrated as well. The results show that the goal of the design has beensuccessfully implemented.
• 中文關鍵字： imaging spectrometer; spectral signature; remote sensing
• 英文關鍵字： --