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Detection and Analysis of Ultrasonic Emission Signals from Plants

Author: ZhaoHuiNa
Tutor: ZhangXiangXue；ShenFanYi
School: Beijing Forestry University
Course: Biophysics
Keywords: Ultrasonic emission The cavitation of Wavelet Analysis Slice
CLC: S718.4
Type: Master's thesis
Year: 2010
Downloads: 43
Quote: 5
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Abstract


The ultrasonic emission of the of plants is the the cavitation of li the catheter or tracheid the is accompanied by the phenomenon of when the the . Detection and analysis of plants ultrasonic emission signal be able to very good research of plants Cavitation and Embolism state, the has a important the significance of the aspects of of the the water physiological of the study of plant and Resistance to Drought , water-saving irrigation and so on . The the main contents of of the present papers is in the the after the the a plurality of sensors is compares the , the formation of a set of Based on LabVIEW ultrasonic emission testing and analysis system , can be signal detection is performed , waveform storage , the waveform playback, parameter extraction , spectrum analysis as well as wavelet analysis , the instrument the sensitivity of the and gathering the number of signals and other indicators with foreign products a considerable . In addition , respectively, use the three groups of instrument to detect the the ultrasonic emission signal slice by the oriental arborvitae , Koelreuteria paniculata, a ball of Platanus acerifolia , and the of Acer truncatum branches xylem , and for the first time on the the the the ultrasonic emission signal of of the trees xylem carried out a the system analysis of , in for the to of the research the trees on a systematic basis xylem in the future ultrasonic emission signal had provided material support . The research results show that the the , the ultrasonic emission signal slice by the oriental arborvitae , of Acer truncatum Bunge , LUAN tree and a ball of Platanus acerifolia branches has a thing in common , there are also differences . In the the the the the same of the Condition under the the Setting , the the a IN Is this four of of 50 slices in in Tree Species ALL signal parameter distribution FIG. Commonness is Great , Specifically , historical , For trees (Koelreuteria henryi) , of the most often by the Cover of signal in , The average The energy 's largest , the Platycladus orientalis of the Minimum by the Cover of signal , The average on minimum energy . Was found in the in the the the affect the test of the - on the temperature of the signal of slice the Ultrasound, - emitting , in the the Medium temperature of to ( 22 ± 1.5 ° C ) under the for , the Platycladus orientalis and Slice of at the a ball of Platanus of the Ultrasound, - emitting signal a maximum of , the energy 's largest , is ( 29 ± 1 ℃ in the the higher temperature for ) and the the the the number of signals in the the slightly lower temperature of to ( 18 ± 1 ° C ) under the for and the the energy . If you have passed a value test is basically the same. The distributed Platycladus orientalis of the different seasons the ultrasonic emission , a ball slice by the Platanus orientalis branches xylem of signal is also have a a larger different , the winter of the a ball of Platanus acerifolia slices, of its ultrasonic emission signal the amount of , and the various characteristics for parameter values ??degree compared with the summer . Large ; the winter distributed Platycladus orientalis slice of , its the amount of ultrasonic emission signal and continuing time - to - average ratio summer less , the is not very different of amplitude , ringing count , and rise time .

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Dendrology
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