Development of a soil detector based on an optical sensor

Lihua Zheng; Luan Pan; Xiaofei An

doi:10.1117/12.811852

2 February 2009 Development of a soil detector based on an optical sensor

Lihua Zheng, Luan Pan, Xiaofei An

Proceedings Volume 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 715709 (2009) https://doi.org/10.1117/12.811852
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

An estimation model of the soil organic matter content has been built based on NIR spectroscopy and a portable soil organic matter detector based on optical sensor is developed. The detector uses a micro processor 89S52 as the Micro Controller Unit (MCU) and consists of an optical system and a control system. The optical system includes a 850nm near-infrared lamp-house, a lamp-house driving-circuit, a Y type optical fiber, a probe, and a photoelectric sensor. The control system includes an amplified circuit, an A/D circuit, a display circuit with LCD, and a storage circuit with USB interface. Firstly the single waveband optical signal from the near-infrared lamp-house is transferred to the surface of the target soil via the incidence fibers. Then the reflected optical signal is collected and transferred to photoelectric sensor, where the optical signal is conveyed to the electrical signal. Subsequently, the obtained electrical signal is processed by 89S52 MCU. Finally, the calculated soil organic matter content is displayed on the LCD and stored in the USB disk. The calibration experiment using the estimation model of the soil organic matter is conducted. The decision coefficient (R2) reaches 0.9839 between the measured data by the soil organic matter sensor and by the laboratory chemistry method.

Citation Download Citation

Lihua Zheng, Luan Pan, and Xiaofei An "Development of a soil detector based on an optical sensor", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 715709 (2 February 2009); https://doi.org/10.1117/12.811852

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KEYWORDS

Sensors

LCDs

Reflectivity

Optical fibers

Photodiodes

Detector development

Signal processing

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