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CROP WATER STRESS MEASUREMENT SYSTEM BASED ON ACOUSTICAL EMISSION TECHNOLOGY

CROP WATER STRESS MEASUREMENT SYSTEM BASED ON ACOUSTICAL EMI...

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第三届全国压电和声波理论及器件技术研讨会

作者： Shi-feng YANG,Xiu-qing WANG,Ji-min ZHAO and Jian-ying GUO College of Electronic Information and Automation,Tianjin University of Science & Technology 1038 Dagu Nanlu,Hexi District,Tianjin 300222,China

A microcomputer-based system of continuously measures water stress in crop in a non-destructive testing method was *** by cohesion between water molecules or adhesion to the conduit wall,the crop xylem cavitation was accompanied by the vessel walls vibration which is the indicator of the water *** physics of ultrasonic acoustic emissions(AEs) were used to measure the crop xylem cavitation events which were the transmission of *** acoustic emissions could be measured both in the audio frequencies and in ultrasonic frequencies between 0.1 and 1 *** optimize the cavitation measurement precision,the PCI-2 data acquisition equipment(DAQ) and R15 sensors,the Physical Acoustics Corp.(PAC),were *** data recorded by the DAQ transferred the microcomputer to be processed and *** conclusions can be draw:cavitation induce AEs tend to shift to higher frequency when crop wood dehydration phenomena produces;the strongest frequencies of AEs in the range of 100-300KHz;to some extend,the frequencies and counts changed gradually with the environment of the temperature. illumination,humidity,concentration of carbon dioxide,transpiration:an interruption of water supply or over-irrigation can easily result in changing of the AEs Frequency and *** system could be useful for agronomists testing irrigation regulation and in search of non-destructive of recording the water stress under the greenhouse conditions,

关键词： Non-destructive testing ultrasonic acoustic emissions xylem cavitation data acquisition

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