Transmittance measurement using scanning LED

• Main Authors: Rosmin Elsa Mohan, Lau, Gih-Keong, Asundi, Anand Krishna, Ping, Yao
• Other Authors: Asundi, Anand K.
• Format: Conference or Workshop Item
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Mechanical engineering; Transmittance Measurement; Scanning LED
• Online Access: https://hdl.handle.net/10356/81578; http://hdl.handle.net/10220/47491
• Institution: Nanyang Technological University

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.