학술논문
Digital imaging of infrared light: Digging deeper.
Document Type
Article
Author
Source
Subject
*INFRARED imaging
*DIGITAL images
*LIGHT filters
*SPECTRAL sensitivity
*DIGITAL cameras
*LED displays
*LED lighting
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Language
ISSN
0031-921X
Abstract
Several previous papers have discussed imaging the infrared emission of LEDs in remote control devices.[[1], [3]] Most of these LEDs appear purple in digital images. We can have students dig deeper by asking several questions regarding the nature of the observed infrared emission: "Why does the infrared LED appear purple?" You could purchase a single 5-mm infrared LED with a wavelength of 720 nm for about $7; however, you will need to build a simple circuit.[8] Alternatively, if you happen to own an Alta-II Reflectance Spectrometer,[9] you have access to four infrared LEDs: 735, 810, 880, and 940 nm. [Extracted from the article]