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Proceedings Paper

Development and application of a novel crop stress and quality instrument
Author(s): Wengjiang Huang; Gang Sun; Jihua Wang; Liangyun Liu; Wengang Zheng
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Paper Abstract

In this paper, a portable diagnostic instrument for crop quality analysis was designed and tested, which can measure the normalized difference vegetation index (PRI) and structure insensitive pigment index (NRI) of crop canopy in the field. The instrument have a valid survey area of 1m×1m when the height between instrument and the ground was fixed to 1.3 meter. The crop quality can be assessed based on their PRI and NRI values, so it will be very important for crop management to get these values. The instrument uses sunlight as its light source. There are six special different photoelectrical detectors within red, blue and near infrared bands, which are used for detecting incidence sunlight and reflex light from the canopy of crop. This optical instrument includes photoelectric detector module, signal process and A/D convert module, the data storing and transmission module and human-machine interface module. The detector is the core of the instrument which measures the spectrums at special bands. The microprocessor calculates the NDVI and SIPI value based on the A/D value. And the value can be displayed on the instrument's LCD, stored in the flash memory of instrument and can also be uploaded to PC through the PC's RS232 serial interface. The prototype was tested in the crop field at different view directions. It reveals the on-site and non-sampling mode of crop growth monitoring by fixed on the agricultural machine traveling in the field. Such simple instruments can diagnose the plant growth status by the acquired spectral response.

Paper Details

Date Published: 9 December 2005
PDF: 6 pages
Proc. SPIE 6024, ICO20: Optical Devices and Instruments, 60241I (9 December 2005); doi: 10.1117/12.666863
Show Author Affiliations
Wengjiang Huang, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Gang Sun, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Jihua Wang, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Liangyun Liu, National Engineering Research Ctr. for Information Technology in Agriculture (China)
Wengang Zheng, National Engineering Research Ctr. for Information Technology in Agriculture (China)


Published in SPIE Proceedings Vol. 6024:
ICO20: Optical Devices and Instruments

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