An Optical-Fiber-Sensor-Based Spectrophotometer for Soil Non-Metallic Nutrient Determination
HE Dong-xian1, HU Juan-xiu1, LU Shao-kun1, HE Hou-yong2
1. College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China 2. Beijing Purkinje General Instrument Co., Ltd., Beijing 100081, China
Abstract：In order to achieve rapid, convenient and efficient soil nutrient determination in soil testing and fertilizer recommendation, a portable optical-fiber-sensor-based spectrophotometer including immersed fiber sensor, flat field holographic concave grating, and diode array detector was developed for soil non-metallic nutrient determination. According to national standard of ultraviolet and visible spectrophotometer with JJG 178—2007, the wavelength accuracy and repeatability, baseline stability, transmittance accuracy and repeatability measured by the prototype instrument were satisfied with the national standard of Ⅲ level; minimum spectral bandwidth, noise and excursion, and stray light were satisfied with the national standard of Ⅳ level. Significant linear relationships with slope of closing to 1 were found between the soil available nutrient contents including soil nitrate nitrogen, ammonia nitrogen, available phosphorus, available sulfur, available boron, and organic matter measured by the prototype instrument compared with that measured by two commercial single-beam-based and dual-beam-based spectrophotometers. No significant differences were revealed from the above comparison data. Therefore, the optical-fiber-sensor-based spectrophotometer can be used for rapid soil non-metallic nutrient determination with a high accuracy.
贺冬仙1，胡娟秀1，鲁绍坤1，何厚勇2. 一种用于土壤非金属养分测试的光纤探头式分光光度计[J]. 光谱学与光谱分析, 2012, 32(01): 214-218.
HE Dong-xian1, HU Juan-xiu1, LU Shao-kun1, HE Hou-yong2. An Optical-Fiber-Sensor-Based Spectrophotometer for Soil Non-Metallic Nutrient Determination. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(01): 214-218.
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