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JOJAPS

eISSN 2504-8457

Journal Online Jaringan Pengajian Seni Bina (JOJAPS)

Surface Temperature Measurement Using He-Ne Laser

a*
Ts. Firdaus Ali , Ts. Siti Rahaida Abdullah a1* & Ts. Mohd Hissham Idris b*
a Mechanical Engineering Department, Politeknik Ibrahim Sultan, KM 10, Jalan Kong Kong 81700 Pasir Gudang, Johor Darul Takzim, Malaysia
b Mechanical Engineering Department, Politeknik Sultan Mizan Zainal Abidin, KM 8, Jalan Paka, 23000 Kuala Dungun, Terengganu Darul Iman, Malaysia

Abstract

This study introduces a non-contact temperature measurement technique on solid surfaces. Temperature changes will result in the formation of
vapor, which will interfere with the rate of reflection of light reflected on it. Helium-Neon (HeNe) lasers are used as reflective light sources, and
photodiodes are used to collect and measure the power and energy of reflected light through solid surfaces. Changes in terms of power and
reflective energy can translate to changes in temperature on a solid surface. In this study, temperature measurement is performed in 2 conditions:
heating and cooling. The temperature change for the heating process is about 30 ° C to 70 ° C in 28 seconds, and for the cooling process is about
from 70 ° C to 50 ° C in 320 seconds. Temperature measurement data taken using this technique is then verified using the calibrated temperature
data logger, and it is found that the temperature measurement using this technique is dependable and reliable.

© 2020 Published by JOJAPS Limited.

Key-word: - He-Ne laser, Non-contact measurement, Temperature

1. Introduction

Temperature is the most frequently measured property in the field of measurement technology. Temperature measurement can
be implemented in 2 techniques, namely, contact and non-contact measurement technique. The contact measurement technique is
a method that requires direct contact between the measuring instrument and the target to be measured. This is the most commonly
used technique for measuring temperature. However, this technique is challenging to adapt to some situations such as dangerous
areas, areas with too high temperatures, and tiny size targets such as on the radiator fins of vehicles.

Here, the non-contact measurement technique can solve the problem. The use of a helium-neon (He-Ne) laser can measure the
temperature at a tiny target due to its light acuity, which reaches 0.66nm. The light coming out of the He-Ne laser will be directed
to the target to be measured, which will then produce a reversal or reflection light. This reflected light can give an impression of
temperature changes on the measured solid surface.

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