Abstract：Spectral performance would be affected by many factors such as temperature, equipment parameters and so on. Humidity fluctuations may occur in practice because of varying weather conditions. The objective of the present research was to find out whether the change in humidity would influence the near infrared spectrum. In this trial, an airproof, humidity-controllable test-bed was established to change the humidity of the mini environment. At 40%, 50%, 60%, 70% and 80% degrees of humidity, each sample’s final spectrum was obtained by removing the background’s spectrum from the sample’s. As whether the influences of the sample’s spectrum and the background’s are equal wasn’t known, this trial was divided into two groups: detecting background and sample at each degree of humidity (group 1) and background’s detecting just performed at 40% degree of humidity (group 2). This research was based on the hardware of NEXUS intelligent FTIR spectrometer, made by Nicolet instrument company U.S.A, using fiber optic diffuse reflectance accessory. The final spectrum was analysed using single variance analysis and Mahalanobis distance methods. The result shows that neither in group 1 nor in group 2, humidity had little influence on NIR.
[1] XU Zhi-long，ZHAO Long-lian，YAN Yan-lu(徐志龙，赵龙莲, 严衍禄). Modern Instruments(现代仪器)，2004，10(5)：29. [2] Ying Yibin, Liu Yande, et al. Trans. of American Society of Agricultural Engineers(ASAE)，2005，48(1)：229. [3] LIU Yan-de，YING Yi-bin，FU Xia-ping(刘燕德，应义斌，傅霞萍). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2005，25(11)：1793. [4] Ying Yibin，Liu Yande，Tao Yang. Applied Optics，2005，44(25)：5224. [5] Clark C J，McGlone V A，Jordan R B. Postharvest Biology and Technology，2003，28(1)：87. [6] LI Yong，WEI Yi-min，WANG Feng(李 勇，魏益民，王 峰). Acta Agriculturae Nucleatae Sinica(核农学报)，2005，19(3)：236. [7] WANG Tao，ZHANG Lu-da, et al(王 韬，张录达, 等). Journal of China Agricultural University(中国农业大学学报)，2004，9(6)：76.
