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Low-frequency characteristics extension for vibration sensors

Yang Xueshan (杨学山), Gao Feng(高 峰) and Hou Xingmin(候兴民)

Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China

Abstract: Traditional magneto-electric vibration sensors and servo accelerometers have severe shortcomings when used to measure vibration where low frequency components predominate. A low frequency characteristic extension for velocity vibration sensors is presented in this paper. The passive circuit technology, active compensation technology and the closed-cycle pole compensation technology are used to extend the measurable range and to improve low frequency characteristics of sensors. These three types of low frequency velocity vibration sensors have been developed and widely adopted in China.

Keywords: vibration sensor; low frequency characteristic extension; passive circuit technology; active compensation technology; closed-cycle pole compensation