Sage Journals: Discover world-class research

Abstract

The laser array spots thermography (LAST) is a new fully non-contact and non-destructive method for inspection of surface cracks. In this study, the capability of this method for inspection of surface crack in specimen at elevated temperature is investigated. The temperature distributions in a specimen at different initial temperature are calculated through simulation and measured through experiment, respectively. Both the simulation and experimental results show that the background noise in the temperature distribution will be increased when the initial temperature of the specimen is enlarged. However, with the aid of an image processing method, the surface cracks in the specimen with initial temperature from 303 K to 573 K are successfully detected by using the LAST method.

Keywords

Laser array spots thermography surface cracks elevated temperature non-destructive testing

Get full access to this article

View all access options for this article.

References

Davies

L.M.

Gueorguiev

and Trampus

, Role of NDT in condition based maintenance of nuclear power plant components, in: 15th World Conference on Nondestructive Testing, Italy, 2000.

Raymond Peacock

, Review of noncontact process temperature measurements in steel manufacturing, Proc. SPIE 3700 (1999), 171.

Maldague

X.P.

and Marinetti

, Pulse phase infrared thermography, J. Appl. Phys. 79 (1996), 2694–2698.

Spositoa

Warda

Cawleya

Nagya

P.B.

and Scrubya

, A review of non-destructive techniques for the detection of creep damage in power plant steels, NDT & E International 43(7) (2010), 555–567.

Almond

D.P.

and Rees

D.A.S.

, Crack imaging by scanning pulsed laser spot thermography, NDT&E International 44 (2011), 216–225.

Schlichting

Maierhofer

Ch.

and Kreutzbruck

, Crack sizing by laser excited thermography, NDT&E International 45 (2012), 133–140.

Pei

, Simulation of surface cracks measurement in first walls by laser spot array thermography, Fusion Engineering and Design 109-111(B) (2015), 1237–1241, 1 November 2016.

Liu

Pei

Xie

and Chen

, Numerical simulation method for IR thermography NDE of delamination defect in multilayered plate, Int. J. Appl. Electromagn. Mech. 52(1-2) (2016), 381–389.

Y.-K.

Kim

J.M.

and Sohn

, Laser lock-in thermography for detection of surface-breaking fatigue cracks on uncoated steel structures, NDT&E International 65 (2014), 54–63.

10.

Y.-K.

Yang

Hwang

and Sohn

, Line laser lock-in thermography for instantaneous imaging of cracks in semiconductor chips, Optics and Lasers in Engineering 73 (2015), 128–136.

11.

Bai

R.B.

H.H.

and Zhang

X.X.

, On wavelets-based holder exponents for clamped-clamped beams crack identification, Applied Mechanics and Materials 94-96 (2011), 381–387.

Detection of surface cracks by laser spot thermography at elevated temperature

Abstract

Keywords

Get full access to this article

References