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时间:2020-03-26
《植物电位信号采集系统的开发与应用.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据第26卷第8期增刊仪器仪表学报2005年8月DevelopmentofMeasuringSystemofPlantElectricalPotentialandItsApplicationYuHaiyelLiGuochenl’2MaChenglinl1(CollegeofBiologicalandAgriculturalEngineering,JilinUniversity,Changchun130025,China)2(EngineeringCollege,ShenyangAgriculturalUniversity,Sheny
2、ang110161,China)AbstractBasedonthecharactersofplantpotentials,itintroducedtheconstructionandtechnologyindevelopingthemeasuringsystemofplantelectricalpotentials,theinputimpedanceoftheamplifiermustbeenoughhigh(一10”~10”Q)inordertomeasuringtheplantweaksignalsandensuringhighc
3、ommonmoderejectionratio(CMRR).Andwavelettransformwasappliedindenoisingbasedoncross—validation(CV)thresholdvalue.theexperimentshowedthatthissystemcouldeffectivelydetectthechangeofplantpotentials,four—weekoldcucumberwasstimulatedbyheatwounding,thevariationpotential(VP)anda
4、ctionpotential(AP)wouldbeevoked,theAP’Svaryingamplitudecanreach40mV;theAPchangedveryfast,itsdurationtimeiSabout0.01~0.02sanditsamplitudeOftenchangefrom15“V~5mV.KeywordsPlantpotentialsVariationpotential(VP)Actionpotential(AP)Measuringsystem植物电位信号采集系统的开发与应用于海业1李国臣1’2马成林11(
5、吉林大学生物与农业工程学院长春130025)2(沈阳农业大学工程学院沈阳110161)摘要植物电位是由生物体发出的不稳定的微弱电信号,其幅值变化有时只有10~20,v[1,2],信号采集过程中,其有效信息很容易被噪声所淹没。根据植物电位的高内阻源特性,在硬件采集系统中,设计了植物信号仪器放大器,该仪器以INAll4和OP27组成屏蔽驱动一级放大电路,以TLC2654和OP27构造稳零和二级放大电路;采用UFA42组成硬件陷波电路抑制信号中的50Hz工模干扰,应用小波降噪技术对信号进行降噪处理。以4周大的黄瓜幼苗为实验对象,试验表明,该植
6、物电位采集系统可有效地记录植物微弱的电信号,植物动作电位的波动周期为0.01~o.02s,可监测的幅值最低可达159V。关键词植物电位信号变异电位动作电位采集系统1IntroductiOnAbout130yearsago,bothBurden—Sanderson(1873)andCharlesDarwin(1875)demonstratedthe’existenceofelectricalsignalsinplant‘“。thebulkofexperimentshavedemonstratedthatplantpotentialscon
7、sistofvariationpotential(VP)andactionpotential(AP)⋯3.InChina,LouChenghouhasresearchedthetransmittingmechanismofplantpotentials‘“.Basedonthepropertiesoftheplantelectricalpotentials‘”,plantpotentialsareverycomplicatedbiologicalsignal,itbelongstolow—frequencyandnonstableult
8、ra—weaksignal.Becausethereareunavoidablestrongnoisesinmeasuredsignals,theeffectivemeasuringsystemisvery
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