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Proceedings Paper

Microcontroller based spectrophotometer using compact disc as diffraction grid
Author(s): Saleha Bano; Talat Altaf; Sunila Akbar
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Paper Abstract

This paper describes the design and implementation of a portable, inexpensive and cost effective spectrophotometer. The device combines the use of compact disc (CD) media as diffraction grid and 60 watt bulb as a light source. Moreover it employs a moving slit along with stepper motor for obtaining a monochromatic light, photocell with spectral sensitivity in visible region to determine the intensity of light and an amplifier with a very high gain as well as an advanced virtual RISC (AVR) microcontroller ATmega32 as a control unit. The device was successfully applied to determine the absorbance and transmittance of KMnO4 and the unknown concentration of KMnO4 with the help of calibration curve. For comparison purpose a commercial spectrophotometer was used. There are not significant differences between the absorbance and transmittance values estimated by the two instruments. Furthermore, good results are obtained at all visible wavelengths of light. Therefore, the designed instrument offers an economically feasible alternative for spectrophotometric sample analysis in small routine, research and teaching laboratories, because the components used in the designing of the device are cheap and of easy acquisition.

Paper Details

Date Published: 19 January 2011
PDF: 5 pages
Proc. SPIE 7991, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy II, 799108 (19 January 2011); doi: 10.1117/12.890979
Show Author Affiliations
Saleha Bano, NED Univ. of Engineering and Technology (Pakistan)
Talat Altaf, NED Univ. of Engineering and Technology (Pakistan)
Sunila Akbar, NED Univ. of Engineering and Technology (Pakistan)

Published in SPIE Proceedings Vol. 7991:
Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy II
Heonsu Jeon; Min Gu; Yi Luo; Chih-Chung Yang; Muqing Liu, Editor(s)

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