Development of a Low-Cost Colorimeter Based on LED Light Sources

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    The spectrophotometric and colorimetric methods are the most widely used methods in various scientific fields, such as physics, materials science, chemistry, biochemistry, and molecular biology. They are based on an application of the Beer and Lambert law. However, the currently available instruments for spectrophotometry and colorimetry mostly use a light source, grating disc, and a silicon photocell. Unfortunately, the use of all these components in combination increases the device costs. The proposed system was developed with a low-cost material, a light emitting diodes (LED) as the light source, and an RGB Sensor. Two types of LEDs having different wavelengths were selected for each solution. The USB serial (through a USB cable) and wireless Bluetooth (the Bluetooth module) were the two alternative communication methods used to control the system and view the results. The measurement range was 0.02 to 30.0 ppm. The colorimeter was successfully used to detect nitrate and fluoride concentrations with an average R2 of 0.99 when compared with the concentrations obtained by using a spectrophotometer (Optizen POP QX, Mecasys, South Korea). The material cost was less than $75.

     

     

     

  • Keywords


    Microcontroller, Spectrophotometric, Low-cost Colorimeter, Light Emitting Diodes.

  • References


      [1] Dasgupta P, Eom LY, Morris KJ, and Li J, Light emitting diode-based detectors. (2003), pp. 337-364.

      [2] Dasgupta PK et al., "Light emitting diode based flow-through optical absorption detectors," Talanta, vol. 40, no. 1, (1993) pp. 53-74.

      [3] Yeh P, Yeh N, Lee CH, and Ding TJ, "Applications of LEDs in optical sensors and chemical sensing device for detection of biochemicals, heavy metals, and environmental nutrients," Renewable and Sustainable Energy Reviews, vol. 75, (2017) pp. 461-468.

      [4] Anh Bui D and Hauser PC, "Absorbance measurements with light-emitting diodes as sources: silicon photodiodes or light-emitting diodes as detectors?," (in eng), Talanta, vol. 116, (2013) pp. 1073-1078.

      [5] Gupta S, Liaw HC, Vadakkepat P, and Starmer CF, "Smartphone spectrophotometer for point-of-care diagnostics in low-resource settings," in 2015 IEEE Region 10 Humanitarian Technology Conference (R10-HTC), (2015), pp. 1-6.

      [6] Chen P et al., "A practical portable photometer using LEDs as inspection light source," in 2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), (2017), pp. 1-6.


 

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Article ID: 25371
 
DOI: 10.14419/ijet.v7i4.40.25371




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