Microcontroller based spectrophotometer using compact disc as diffraction grid

Saleha Bano; Talat Altaf; Sunila Akbar

doi:10.1117/12.890979

19 January 2011 Microcontroller based spectrophotometer using compact disc as diffraction grid

Saleha Bano, Talat Altaf, Sunila Akbar

Proceedings Volume 7991, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy II; 799108 (2011) https://doi.org/10.1117/12.890979
Event: Asia Communications and Photonics Conference and Exhibition, 2010, Shanghai, Shanghai, China

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.

Citation Download Citation

Saleha Bano, Talat Altaf, and Sunila Akbar "Microcontroller based spectrophotometer using compact disc as diffraction grid", Proc. SPIE 7991, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy II, 799108 (19 January 2011); https://doi.org/10.1117/12.890979

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KEYWORDS

Spectrophotometry

Absorbance

Microcontrollers

Compact discs

Visible radiation

Diffraction

Transmittance

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