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Proceedings Paper

Development of an optical instrument to determine the pesticide residues in vegetables
Author(s): Zhengjun Qiu; Hui Fang; Weimin Li; Yong He
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Paper Abstract

An optical instrument was developed to determine the pesticide residues in vegetables based on the inhibition rate of organophosphates against acrtyl-cholinesterase (AChE). The instrument consists mainly of a solid light source with 410nm wavelength, a sampling container to store the liquid, an optical sensor to test the intensity of transmission light, a temperature sensor, and a MCU based data acquisition board. The light illuminates the liquid in the sampling container, and the absorptivity was determined by the amount of the pesticide residues in the liquid. This paper involves the design of optical testing system, the data acquisition and calibration of the optical sensor, the design of microcontroller-based electrical board. Tests show that the absorption rate is related to the pesticide residues and it can be concluded that the pesticide residues exceed the normal level when the inhibition rate is over 50 percent.

Paper Details

Date Published: 9 December 2005
PDF: 5 pages
Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 602417 (9 December 2005); doi: 10.1117/12.666851
Show Author Affiliations
Zhengjun Qiu, Zhejiang Univ. (China)
Hui Fang, Zhejiang Univ. (China)
Weimin Li, Zhejiang Univ. (China)
Yong He, Zhejiang Univ. (China)


Published in SPIE Proceedings Vol. 6024:
ICO20: Optical Devices and Instruments
James C. Wyant; X. J. Zhang, Editor(s)

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