Transmittance measurement using scanning LED
Rosmin Elsa Mohan
Asundi, Anand Krishna
Date of Issue2017
Fifth International Conference on Optical and Photonics Engineering
School of Mechanical and Aerospace Engineering
In order to measure the transmittance for a large field of view (FOV), a system based on scanning LED is developed. The system mainly consists of tunable LEDs, a glass diffuser and a camera. The LED panel would display different colors in the CIE color space. An algorithm of converting the light wavelength to the RGB values is adopted. The images are captured using a monochrome camera. Depending on the number of colors displayed, the transmittance map for the entire spread of visible colors can be determined. Results are compared with those measured through a spectrometer. The spectral transmittance for the two methods exhibit good similarity. The system provides a means of measuring transmittance with no moving parts and can be extended to other hyperspectral imaging applications.
© 2017 Society of Photo-optical Instrumentation Engineers. All rights reserved. This paper was published in Fifth International Conference on Optical and Photonics Engineering and is made available with permission of Society of Photo-optical Instrumentation Engineers.