Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

Lockin thermography is a remote nondestructive testing method, suited for the inspection of large surfaces. As the method is based on heat conduction inside the material it can reveal any variation of the material thermal properties: the heating source is modulated at the desired frequency and the surface temperature is analyzed in order to obtain the amplitude signal and the phase signal in relation to the heating source. The feasibility of phase angle images eliminates the need for homogeneous surface heating which would be difficult for large areas. Inspection and quality control of the big structures of an airplane are essential to assure integrity and safety. To demonstrate the applicability of lockin thermography for on field inspections, we present the results obtained on an airplane consisting mainly of GFRP (Grob 115). Though no special treatment of the surface has been performed, we could detect hidden structures and repairs.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16A

Chapter

Chapter 1: Standard Techniques

Section

Thermal Waves

Pages

357-364

DOI

10.1007/978-1-4615-5947-4_47

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Glass Fiber Airplane Inspected with Infrared Lockin Thermography

Brunswick, ME

Lockin thermography is a remote nondestructive testing method, suited for the inspection of large surfaces. As the method is based on heat conduction inside the material it can reveal any variation of the material thermal properties: the heating source is modulated at the desired frequency and the surface temperature is analyzed in order to obtain the amplitude signal and the phase signal in relation to the heating source. The feasibility of phase angle images eliminates the need for homogeneous surface heating which would be difficult for large areas. Inspection and quality control of the big structures of an airplane are essential to assure integrity and safety. To demonstrate the applicability of lockin thermography for on field inspections, we present the results obtained on an airplane consisting mainly of GFRP (Grob 115). Though no special treatment of the surface has been performed, we could detect hidden structures and repairs.