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	Design and experiment of the detection circuit for electrostatically levitated accelerometers
	Wu Liming ; Dong Jingxin ; Han Fengtian
	2010-05-10 ; 2010-05-10
关键词	Practical Experimental/ accelerometers capacitance measurement current transformers detector circuits electrostatic devices equivalent circuits low-pass filters space vehicle electronics/ detection circuit electrostatically levitated accelerometers space application equivalent circuit current transformer bridge wideband amplifying circuit quad single-pole switch single-throw analogue switches phase-sensitive detection/ B7230 Sensing devices and transducers B7630D Space vehicle electronics B1250 Modulators, demodulators, discriminators and mixers B7320E Velocity, acceleration and rotation measurement B5180D Electrostatic devices
中文摘要	This paper introduced the development of electrostatic levitation accelerometer (ELA) and its application in space nowadays. After ELA's basic working principle was generalized, the detection circuit of ELA was designed in order to detect very weak differential capacitance signal AC. The equivalent circuit model of the current transformer bridge was set up, in which differential capacitance was modulated, and then the gain K/sub AC/ in wideband amplifying circuit was deduced, which was used to magnify the weak modulated signal. In the demodulating process, quad single-pole/single-throw analogue switches, which were controlled by two synchronizing TTL square waves, were adopted. The cut-off frequency f/sub -3dB/ of the low pass filter was evaluated so as to keep 0 dB gain in the range of working frequency f/sub s/, and get much attenuation in the frequencies higher than the carrier frequency f/sub 0/. Experiments showed that the detection circuits sensitivity was 0.601 mV/fF. Accounting for the circuit inherent noise and parasitic capacitance, the minimal resolution approached 1.06 fF.
语种	中文 ; 中文
出版者	China Instrum. Soc ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25189]
专题	清华大学
推荐引用方式 GB/T 7714	Wu Liming,Dong Jingxin,Han Fengtian. Design and experiment of the detection circuit for electrostatically levitated accelerometers[J],2010, 2010.
APA	Wu Liming,Dong Jingxin,&Han Fengtian.(2010).Design and experiment of the detection circuit for electrostatically levitated accelerometers..
MLA	Wu Liming,et al."Design and experiment of the detection circuit for electrostatically levitated accelerometers".(2010).

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