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Non-contact measurement of angle of view between the inspected surface and the thermal imager.pdf
Infrared Physics Technology 72 (2015) 77–83
Contents lists available at ScienceDirect
Infrared Physics Technology
journal homepage: /locate/infrared
Non-contact measurement of angle of view between the inspected surface and the thermal imager
Pablo Rodrigues Muniz a,1, Robson da Silva Magalh?es b,2, Shirley Peroni Neves Cani a,1, Clainer Bravin Donadel a,?
a IFES – Federal Institute of Espírito Santo, Av. Vitória, 1729 – Jucutuquara, Vitória, ES 29040-780, Brazil b UFSB – Federal University of South Bahia, Rua Itabuna, S/N – BR 415 – km 39, Ferradas, Itabuna, BA 45613-204, Brazil
highlights
A method of measuring the angle of view was proposed. The proposed method does not need contact with the inspected object. The proposed method employs laser distance meters, commonly available in the market. The experimental evaluation led to estimations with acceptable errors.
article info
Article history: Received 23 June 2015 Available online 21 July 2015
Keywords: Thermography Thermal imager Angle of view Non-contact measurement
abstract
The angle of view between inspected object and thermal imager in?uences the values of temperature measured by infrared thermography. This happens because the emissivity depends on the angle of radiation, and because the apparent temperature measured is in?uenced by that angle of view combined to thermal imager’s ?eld of view. Therefore, it is necessary to know the angle of view during thermographic inspection, which is generally not feasible due to safety reasons. This paper develops a method of measuring the angle of view with no contact with the inspected object, by employing laser distance meters, commonly available in the market.
ó 2015 Elsevier B.V. All rights reserved.
1. Introduction
Infrared thermography is a technique widely used in predictive maintenance of electrical equipments because it is non-invasive, non-destructive and safe [1–4]. Also because many defects have temperature rise as a primary symptom of failure [1,4,5
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