A low-cost web-camera-based multichannel fiber-optic spectrometer structure

Sarun Sumriddetchkajorn

doi:10.1117/12.870170

9 November 2010 A low-cost web-camera-based multichannel fiber-optic spectrometer structure

Sarun Sumriddetchkajorn

Proceedings Volume 7850, Optoelectronic Imaging and Multimedia Technology; 78500Y (2010) https://doi.org/10.1117/12.870170
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

This paper shows how a web camera can be used to realize a low-cost multichannel fiber-optic spectrometer suitable for educational purposes as well as for quality control purposes in small and medium enterprises. Our key idea is to arrange N input optical fibers in a line and use an external dispersive element to separate incoming optical beams into their associated spectral components in a two-dimensional (2-D) space. As a web camera comes with a plastic lens, each set of spectral components is imaged onto the 2-D image sensor of the web camera. For our demonstration, we build a 5-channel web-camera based fiber-optic optical spectrometer and simply calibrate it by using eight lightsources with known peak wavelengths. In this way, it functions as a 5-channel wavelength meter in a 380-700 nm wavelength range with a calculated wavelength resolution of 0.67 nm/pixel. Experimental results show that peak operating wavelengths of a light emitting diode (λp = 525 nm) and a laser pointer (λp = 655 nm) can be measured with a ±2.5 nm wavelength accuracy. Total cost of our 5-channel fiber-optic spectrometer is ~USD92.50.

Citation Download Citation

Sarun Sumriddetchkajorn "A low-cost web-camera-based multichannel fiber-optic spectrometer structure", Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78500Y (9 November 2010); https://doi.org/10.1117/12.870170

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