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Proceedings Paper

Quantitative color measurement of pH indicator paper using trichromatic LEDs and TCS230 color sensor
Author(s): T. N. Ghorude; A. L. Chaudhari; A. D. Shaligram
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Paper Abstract

Quantitative analysis of pH indicator paper color is needed in the various fields. An indigenously developed Tristimulus colorimeter is used in this work for pH Indicator paper color measurement. The colorimeter uses Trichromatic RGB LEDs and a programmable color light to frequency converter (TCS230), combining configurable silicon photodiodes and a current to frequency converter on a single monolithic CMOS integrated circuit. The output is a square wave (50% duty cycle) with frequency directly proportional to light intensity. Digital input and digital output allow directly to a microcontroller. The light to frequency converter reads an 8*8 array of photodiodes. Sixteen photodiodes have red filters, 16 photodiodes have green filters, 16 photodiodes have blue filters, and 16 photodiodes are clear with no filters. All 16 photodiodes of the same colors are connected in parallel and type of photodiode the device uses during operation is pin selectable. Solutions having different standard pH were prepared and indicator paper was dipped in solution, it shows change in color. Using the developed RGB colorimeter chromaticity coordinates were measured and compared with the chromaticity coordinates measured using Ocean Optics HR-4000 high resolution spectrophotometer.

Paper Details

Date Published: 25 August 2009
PDF: 5 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754L (25 August 2009); doi: 10.1117/12.839311
Show Author Affiliations
T. N. Ghorude, N.B. Mehta Science College (India)
A. L. Chaudhari, Arts, Science and Commerce College (India)
A. D. Shaligram, Univ. of Pune (India)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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