Prototype of a Small Low Noise Absolute Displacement Sensor

Abstract

Abstract-Inertial seismic sensors have typically a velocity readout, in order to offer a large dynamic range in a large frequency range. However, in some precision engineering applications, it can be preferable to access to the displacement. An example is the so-called sky-hook spring strategy used for active vibration isolation. In this paper, we present a prototype of small inertial sensor with a displacement readout. It is based on a commercial low cost geophone, which has been modified to measure the displacement with a capacitive sensor. It results in a compact sensor with a resolution which is a factor 10 better than the commercial geophone, but a limited range of amplitudes. The paper finished with an attempt to extend the bandwidth of the sensor at low frequency.Index Terms-Absolute displacement sensor, geophone, capacitive sensor, inertial reference.

Microwave Resonant Sensor Based on MCSRR Research

“…Through the joint efforts of researchers at home and abroad, the topics based on CSRR structure become more and more perfect and mature. At present, CSRR-based sensors are widely used in such fields as biosensing [11][12][13][14][15] , pressure detection [16] , displacement detection [17][18][19][20][21] , temperature detection [22] , dielectric detection [23][24][25][26][27] and gas-sensitive detection [28][29][30] . According to the above background, the main content of this paper is the research and design of microwave resonant sensors based on the loaded MCSRR structure.…”

Dual-band microwave sensor based on cross-finger MCSRR Research

“…Through the joint efforts of researchers at home and abroad, the subject based on CSRR structure becomes more and more perfect and mature. At present, CSRR-based sensors are widely used in such fields as displacement detection [13][14][15][16][17], dielectric detection [18][19][20][21][22] and gas-sensitive detection [23][24][25]. Microwave sensors based on CSRR structure are characterised by smaller physical size, easy integration, higher measurement accuracy and relatively simple data processing.…”