The design and performance analysis of PH sensor using IR LED

Mohd Sadik, Nur Atiqah (2022) The design and performance analysis of PH sensor using IR LED. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

	Text (24 Pages) The design and performance analysis of PH sensor using IR LED.pdf - Submitted Version Download (581kB)
	Text (Full text) The design and performance analysis of PH sensor using IR LED.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

Every liquid in the world has their own potential hydrogen (pH) value to define their acidity or basicity of aqueous. pH term is widely used in chemistry, biology, and agronomy to measure the concentration of hydrogen ion. Infrared pH sensor is the subject of this project. The concentrate of this design and development will be on pH measurement in everyday applications, such as determining the pH value of lime juice, vinegar, mineral water, etc. The aim is to design and fabricate a pH sensor based on infrared wave and to analyze its performance to achieve optimize results. IR LED will be used as a pH sensor to measure the pH value with 940nm wavelength. IR LED performance will be analyzed when IR LED length varied from 1cm to 10cm and tilted to 0°, 30° and 60°. Arduino Nano will read the sensor then LCD will display the voltage of any types of liquid measured. As a result, the voltage vs pH is inversely proportional where the higher voltage value, the lower pH value. In addition, sensor needs to be placed in parallel orientation (0°) because the infrared absorption is zero if it is in perpendicular orientation (30° & 60°). The sensitivity of pH sensor of this project is 1.1674 V/pH It has a strong response of alkaline solution towards 940nm wavelength due to less infrared absorption of the liquid samples. This project can be used to improve the performance of pH sensor.

Actions (login required)

View Item