Vol. 112, Issue 1, January 2010, pp. 80-94

Development of Laser LEDs Based a Programmable Optical Sensor for Detection of Environmental Pollutants

^*Amit K. Sharma and R. K. Tiwari

Department of Physics, Hindustan College of Science and Technology

Farah, Mathura-281122 (U.P.) India

^*Fax: +91-565-2763364

E-mail: amit_vashishtha1980@rediffmail.com

Received: 30 November 2009   /Accepted: 22 January 2010   /Published: 29 January 2010

Abstract: The laser LED based optical sensor and its multifunctional operation for detection of environmental pollutants are described. The work will provide the instructions to design of circuitry for optical sensor instrument with a program based on a microcontroller (8902051-24PI), and to allow this program to communicate via RS-232 with computer. An algorithm is outlined by which the sensor instrument can use three laser LEDs (blue, Green and red) to quantify the composition of pollutant. The operation of measurement through optical sensor has been applied to the study of detection and rate of reaction of pollutant i.e. methyl parathion and the produced informative data were also correlated with UV-vis spectrophotometry for the validation of results. The purpose of designed optical sensor is that the sophisticated analytical techniques show costly impact, time taking process, high consumable solvents and not suit for field application purpose which focuses the merits of the optical sensor.

Keywords: Laser light emitting diode, Photodiode, Data acquisition system (DAS), Pollutants, UV-vis spectrophotometer

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