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Sensors 2013, 13(3), 2986-2996; doi:10.3390/s130302986
Article

Mid-Infrared Lifetime Imaging for Viability Evaluation of Lettuce Seeds Based on Time-Dependent Thermal Decay Characterization

1
, 1
, 2
, 3
 and 2,*
1 Center for Analytical Instrumentation Development, Korea Basic Science Institute, 169-148 Gwahak-ro, Yuseong-gu, 305-806 Daejeon, Korea 2 Department of Biosystems Machinery Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, 305-764 Daejeon, Korea 3 Marine Transportation Research Division, Korea Institute of Ocean Science and Technology, 321312 Beon-gil, Yuseong-daero, Yuseong-gu, 305-343 Daejeon, Korea
* Author to whom correspondence should be addressed.
Received: 7 February 2013 / Revised: 25 February 2013 / Accepted: 27 February 2013 / Published: 1 March 2013
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Abstract

An infrared lifetime thermal imaging technique for the measurement of lettuce seed viability was evaluated. Thermal emission signals from mid-infrared images of healthy seeds and seeds aged for 24, 48, and 72 h were obtained and reconstructed using regression analysis. The emission signals were fitted with a two-term exponential model that had two amplitudes and two time variables as lifetime parameters. The lifetime thermal decay parameters were significantly different for seeds with different aging times. Single-seed viability was visualized using thermal lifetime images constructed from the calculated lifetime parameter values. The time-dependent thermal signal decay characteristics, along with the decay amplitude and delay time images, can be used to distinguish aged lettuce seeds from normal seeds.
Keywords: mid-infrared thermography; thermal lifetime image; nondestructive test; lettuce seed; seed viability mid-infrared thermography; thermal lifetime image; nondestructive test; lettuce seed; seed viability
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kim, G.; Kim, G.H.; Ahn, C.-K.; Yoo, Y.; Cho, B.-K. Mid-Infrared Lifetime Imaging for Viability Evaluation of Lettuce Seeds Based on Time-Dependent Thermal Decay Characterization. Sensors 2013, 13, 2986-2996.

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