Assessment of Infrared Thermography for Cyclic High-Temperature Measurement and Control

Infrared thermography (IRT), a non-invasive temperature measurement technique has been investigated and developed for use with cyclic hightemperature loading. The technique utilizes an infrared thermography camera (IRTC) and Rolls-Royce HE23 black thermal paint (TP). The TP is applied to a test-piece surface to provide a stable emissivity value and accurate temperature measurement for the duration of thermal cycling. Spot-welded type N thermocouples (NTCs) are utilized for accuracy validation of the IRTC technique for both temperature monitoring and temperature control. An evaluation of the technique has been employed upon diverse test specimen geometries and alloy compositions at temperatures between 100°C and 700°C. Unfavorable effects during cyclic temperature measurement such as thermocouple shadowing are also highlighted and quantified. In combination with HE23 TP, IRTC control and measurement have proven accurate to within ±2°C NTCs, a validated cyclic high-temperature measurement technique.

J. P. Jones, S. P. Brookes, M. T. Whittaker, R. J. Lancaster, and B. Ward

Evaluation of Existing and New Sensor Technologies for Fatigue, Fracture and Mechanical Testing, STP 1584, 2015. doi: 10.1520/STP158420140080