Abstract:Grounding on the concepts of biophotonics measurement, the authors first used a red semiconductor laser (655 nm) to irradiate fruits. Compared with other kinds of illuminating sources, the red semiconductor laser is less expensive and takes little space. The laser-induced photoluminescence spectrums could be detected by coupling fibre-optics probe when the fruits are illuminated by laser. And the spectrum has a distinct peak of relative intensity around the 685 nm wavelength that varies with the degree of fruit maturity. Sugar content measurement was used to prove the laser-induced photoluminescence measurement. The authors tested the sugar content of the fruit specimens, and found that the relative peak value of the fruits’ laser-induced photoluminescence spectrum decreases with the increase in their sugar content. The authors used partial least-squares (PLS) regression to perform an analysis of the relationship between the laser-induced photoluminescence intensity and the sugar content, fitting a curve of the two parameters. The correlation coefficient r of the fitted value and the actual value is 98.92% for red-inside plum and 97.31% for nectarine. So the authors could generalize that there is an approximate linear relationship between the peak value of laser-induced photoluminescence intensity and the sugar content of fruits, and we could use the maturity measurement based on this concept to decide the fruit ripeness. The authors designed the analytic program for this laser-induced photoluminescence spectrum measurement system, which mainly realizes two functions: generating the standard ripe spectrum of a certain kind of fruit from a quantity of their spectra, and, according to this standard spectrum, determining the maturity degree of an unknown spectrum, and at the same time, displaying the unknown laser-induced photoluminescence spectrum. Incorporating this analytic program with the optical spectrometer, it becomes conceivable to test the fruit maturity very conveniently and quickly. The measurement system of fruit maturity based on laser-induced photoluminescence spectrum has also been used to test various fruits. This measurement is nondestructive and inexpensive, and does not require complicated equipment, a feature of great importance in real-time measurement of fruit maturity.
王乐妍,张冬仙,章海军,王晓萍. 基于激光光致发光光谱的果实成熟度测试方法研究[J]. 光谱学与光谱分析, 2008, 28(12): 2772-2776.
WANG Le-yan, ZHANG Dong-xian, ZHANG Hai-jun, WANG Xiao-ping. Measurement of Fruit Maturity Based on Laser-Induced Photoluminescence Spectrum. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(12): 2772-2776.
[1] YE Qi-zheng, YAO Hong-lin, LI Li, et al(叶齐政,姚宏霖,李 黎,等). Plant Physiology Communications(植物生理学通讯), 1999, 35(4): 304. [2] L′homme C, Peschet J L, Puigserver A, et al. Journal of Chromatography A, 2001, 920: 291. [3] Noboru Muramatsu, Naoki Sakurai, Naoki Wada, et al. Postharvest Biology and Technology, 1999, 15: 83. [4] Marc Valente, Jean Yves Ferrandis. Postharvest Biology and Technology, 2003, 29: 219. [5] RIU Yu-kui, HUANG Kun-lun, WANG Wei-min, et al(芮玉奎,黄昆仑,王为民,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(12): 2190. [6] LIU Jie, YU Chang-qing, LI Jia-ze, et al(刘 杰,于常青,李家泽,等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2001,21(6): 769. [7] Sarah Schotte, Nele De Bellie, Josse De Baerdemaeker. Postharvest Biology and Technology, 1999, 17: 105. [8] YING Yi-bin, LIU Yan-de, FU Xia-ping(应义斌,刘燕德,傅霞萍). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2006, 26(1): 63. [9] YING Yi-bin, RAO Xiu-qin, MA Jun-fu(应义斌,饶秀勤,马俊福). Transactions of the Chinese Society of Agricultural Engineering(CSAE)(农业工程学报), 2004, 20(2): 144. [10] XU Hui-rong, YING Yi-bin(徐惠荣,应义斌). Journal of Zhejiang University·Agriculture and Life Science(浙江大学学报·农业与生命科学版), 2002, 28(4): 460. [11] Sirinnapa Saranwong, Jinda Sornsrivichai, Sumio Kawano. Postharvest Biology and Technology,2004, 31: 137. [12] HAN Dong-hai, LIU Hai-xin, ZHAO Li-li, et al(韩东海,刘海鑫,赵丽丽,等). Transaction of the Chinese Society of Agricultural Machinery(农业机械学报), 2003, 34(6): 112. [13] Paras N Prasad. Current Opinion in Solid State and Materials Science, 2004, 8: 11. [14] Jennifer Riesz, Joel Gilmore, Paul Meredith. Spectrochimica Acta Part A, 2005, 61: 2153. [15] Polder G, G W A M van der Herjden, et al. Postharvest Biology and Technololgy, 2004, 34: 117. [16] Vogel R, Meredith P, Harvey M D, et al. Spectrochimica Acta Part A, 2004, 60: 245. [17] SONG Yi, ZHANG Dong-xian, LIU Chao(宋 奕,张冬仙,刘 超). Optical Instruments(光学仪器), 2006, 28(3): 17. [18] DUAN Hong-tao, ZHANG Bai, LIU Dian-wei, et al(段洪涛,张 柏,刘殿伟,等). J. Infrared Millim. Waves(红外与毫米波学报), 2006, 25(6): 355. [19] Hyun Kwon Noh, Renfu Lu. Proc of SPIE, 2005, 5996: 599601-1. [20] Ziena H M S. Food Chemistry, 2000, 71: 167.