Quantitative color measurement of pH indicator paper using trichromatic LEDs and TCS230 color sensor

T. N. Ghorude; A. L. Chaudhari; A. D. Shaligram

doi:10.1117/12.839311

25 August 2009 Quantitative color measurement of pH indicator paper using trichromatic LEDs and TCS230 color sensor

T. N. Ghorude, A. L. Chaudhari, A. D. Shaligram

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73754L (2009) https://doi.org/10.1117/12.839311
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

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.

Citation Download Citation

T. N. Ghorude, A. L. Chaudhari, and A. D. Shaligram "Quantitative color measurement of pH indicator paper using trichromatic LEDs and TCS230 color sensor", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754L (25 August 2009); https://doi.org/10.1117/12.839311

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available