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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 13 — May. 1, 2010
  • pp: C181–C190

Detection of chlorine with concentration of 0.18 kg / m 3 in concrete by laser-induced breakdown spectroscopy

K. Sugiyama, T. Fujii, T. Matsumura, Y. Shiogama, M. Yamaguchi, and K. Nemoto  »View Author Affiliations


Applied Optics, Vol. 49, Issue 13, pp. C181-C190 (2010)
http://dx.doi.org/10.1364/AO.49.00C181


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Abstract

The chlorine concentration in concrete samples was measured by laser-induced breakdown spectroscopy (LIBS). One or two pulsed second harmonic Nd:YAG lasers ( λ = 532 nm ) were used for the generation of laser-induced breakdown, and an intensified CCD camera, spectrometer, and optical bundle fiber were used for spectral measurement. To maximize the spectral intensity of the chlorine fluorescence line at a wavelength of 837.59 nm , the time delay between laser irradiation and spectral measurement, the time delay between the two laser pulses in double-pulse measurement, and the gate width of the spectral measurement were optimized. The linear relationship between the spectral intensity of the chlorine fluorescence line and the chlorine concentration was verified for pressed samples with chlorine con centrations from 0.18 to 5.4 kg / m 3 . The signal-to-noise ratio was higher than 2 for the sample with a chlorine concentration of 0.18 kg / m 3 ( 0.008   wt.   % ). Thus, a chlorine concentration of 0.6 kg / m 3 , at which the reinforcing bars in concrete structures start to corrode, can be detected. These results show that LIBS is effective for the quantitative measurement of chlorine concentration in concrete with high sensitivity.

© 2010 Optical Society of America

OCIS Codes
(300.6210) Spectroscopy : Spectroscopy, atomic
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(110.0115) Imaging systems : Imaging through turbulent media
(280.5395) Remote sensing and sensors : Plasma diagnostics
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: October 15, 2009
Revised Manuscript: February 22, 2010
Manuscript Accepted: February 25, 2010
Published: March 30, 2010

Citation
K. Sugiyama, T. Fujii, T. Matsumura, Y. Shiogama, M. Yamaguchi, and K. Nemoto, "Detection of chlorine with concentration of 0.18 kg/m3 in concrete by laser-induced breakdown spectroscopy," Appl. Opt. 49, C181-C190 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-13-C181

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