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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 7 — Mar. 1, 2009
  • pp: C11–C23

Laser photothermal radiometric instrumentation for fast in-line industrial steel hardness inspection and case depth measurements

Xinxin Guo, Konesh Sivagurunathan, Jose Garcia, Andreas Mandelis, Salvatore Giunta, and Salvatore Milletari  »View Author Affiliations


Applied Optics, Vol. 48, Issue 7, pp. C11-C23 (2009)
http://dx.doi.org/10.1364/AO.48.000C11


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Abstract

A contact-free, nondestructive laser photothermal radiometric instrumentation technique was developed to meet industrial demand for on-line steel hardness inspection and quality control. A series of industrial steel samples, flat or curvilinear, with different effective hardness case depths ranging between 0.21 and 1.78 mm were measured. The results demonstrated that three measurement parameters (metrics) extracted from fast swept-sine photothermal excitation and measurements, namely, the phase minimum frequency f min , the peak or trough frequency width W, and the area S, are complementary for evaluating widely different ranges of hardness case depth: f min is most suitable for large case depths, and W and S for small case depths. It was also found that laser beam angular inclination with respect to the surface plane of the sample strongly affects hardness measurement resolution and that the phase frequency maximum is more reliable than the amplitude maximum for laser beam focusing on the sample surface.

© 2008 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(160.3900) Materials : Metals
(350.5340) Other areas of optics : Photothermal effects

History
Original Manuscript: August 19, 2008
Manuscript Accepted: September 15, 2008
Published: October 22, 2008

Citation
Xinxin Guo, Konesh Sivagurunathan, Jose Garcia, Andreas Mandelis, Salvatore Giunta, and Salvatore Milletari, "Laser photothermal radiometric instrumentation for fast in-line industrial steel hardness inspection and case depth measurements," Appl. Opt. 48, C11-C23 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-7-C11


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