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Mid-Infrared Lifetime Imaging for Viability Evaluation of Lettuce Seeds Based on Time-Dependent Thermal Decay Characterization
Center for Analytical Instrumentation Development, Korea Basic Science Institute, 169-148 Gwahak-ro, Yuseong-gu, 305-806 Daejeon, Korea
Department of Biosystems Machinery Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, 305-764 Daejeon, Korea
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; in revised form: 25 February 2013 / Accepted: 27 February 2013 / Published: 1 March 2013
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
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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.
Kim G, Kim GH, 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(3):2986-2996.
Kim, Ghiseok; Kim, Geon H.; Ahn, Chi-Kook; Yoo, Yoonkyu; Cho, Byoung-Kwan. 2013. "Mid-Infrared Lifetime Imaging for Viability Evaluation of Lettuce Seeds Based on Time-Dependent Thermal Decay Characterization." Sensors 13, no. 3: 2986-2996.