石墨烯薄膜声源声场特性测试及电路改进
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摘要
针对石墨烯薄膜优异的导热导电性,基于热致发声原理,构建了石墨烯薄膜声源系统。设计并制作了不同基底的石墨烯薄膜声源,利用最新声压公式分析其声压影响因素,并对声场特性进行了测试,从而验证了石墨烯薄膜作为新型声源的可行性。针对石墨烯薄膜声源存在的"频率失真"问题,提出了同相运算放大电路的改进方法,使原输入交流信号与直流偏置电压在运放电路输出端叠加,从而使输出声信号端产生与输入交流电频率同频率的一倍频声信号。
Aiming at the excellent thermal conductivity of graphene films, a graphene film sound source system was constructed based on the principle of thermoacoustic effect. The influence of the sound pressure on the sound pressure was analyzed by using the latest sound pressure formula, and the acoustic field characteristics were tested and verified as the feasibility of the new sound source. Aiming at the "frequency distortion" problem of graphene thin film loudspeaker, An improved method of the in-phase operational amplifier circuit is proposed to superimpose the original input AC signal and the DC bias voltage at the output end of the operational amplifier circuit so that the output sound signal terminal with the input AC frequency with the same frequency of the frequency sound signal.
Aiming at the excellent thermal conductivity of graphene films, a graphene film sound source system was constructed based on the principle of thermoacoustic effect. The influence of the sound pressure on the sound pressure was analyzed by using the latest sound pressure formula, and the acoustic field characteristics were tested and verified as the feasibility of the new sound source. Aiming at the "frequency distortion" problem of graphene thin film loudspeaker, An improved method of the in-phase operational amplifier circuit is proposed to superimpose the original input AC signal and the DC bias voltage at the output end of the operational amplifier circuit so that the output sound signal terminal with the input AC frequency with the same frequency of the frequency sound signal.
引文
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[3]万广通,董卫,王红星.一种新型热致发声装置的特性研究[J].电声技术,2011,35(8):27-29.
[4]Braun F.UeberLichtenmission an einigen Electroden in Electrolyten[J].Annalen Der Physik,2010,301(6):361-364.
[5]童立红.基于碳纳米管薄膜热声光声特性及蜃景效应的理论研究和数值分析[D].合肥:中国科学技术大学,2015.
[6]吴宵军,董卫,陈艳,等.一种新型电热声转换装置的特性研究[J].噪声与振动控制,2010(3):160-163.
[7]Tian H,Ren T L,Xie D,et al.Graphene-on-papersound source devices[J].Acs Nano,2011,5(6):4878.
[8]Tian H,Xie D,Yang Y,et al.Static behavior of a graphene-based sound-emitting device[J].Nanoscale,2012,4(11):3345.
[9]Suk J W,Kirk K,Hao Y,et al.Thermoacoustic sound generation from monolayer graphene for transparent and flexible sound sources[J].Advanced Materials,2012,24(47):6342.
[10]Hu H,Zhu T,Xu J.Model for thermoacoustic emission from solids[J].Applied Physics Letters,2010,96(21):853.
[11]VesterinenV,Niskanen A O,Hassel J,etal.Fundamental efficiency ofnanother-mophones:modeling and experiments[J].Nano letters,2010,10(12):5020-5024.
[12]Tian H,Yang Y,Li C,et al.Flexible,transparent single-layer graphene earphone[C]//Electron Devices Meeting.IEEE,2014:15.3.1-15.3.4.
[13]南余荣,陈海东,陈印.双管正激变换器的钳位电路研究[J].电气自动化,2012,34(5):81-82.
[14]游洋,李双,程予露,等.基于钳位电路的碳纳米管薄膜声源系统优化[J].电子技术应用,2015,41(12):54-57.
[15]黄旭,李双,卞安华,等.多倍直流偏置电压对碳纳米管薄膜声源的影响[J].电声技术,2017,41(2):34-38.
[16]任骏原.同相比例运算电路输入电阻的分析[J].渤海大学学报:自然科学版,2013(1):30-32.
[17]任骏原.任意比例系数的同相比例运算电路[J].现代电子技术,2011,34(1):173-174.
[18]马敬敏.基于电阻平衡条件的同相求和运算电路设计[J].辽宁师范大学学报:自然科学版,2011,34(1):51-53.
[19]陈路瑶,黄光明,马丽,等.电流型运算放大器在应用电路中的特性研究[J].电子设计工程,2012,20(17):61-65.