Design and initial characterization of a compact, ultra high vacuum compatible, low frequency, tilt accelerometer

A compact tilt accelerometer with high sensitivity at low frequency was designed to provide low frequency corrections for the feedback signal of the Advanced Laser Interferometer Gravitational Wave Observatory active seismic attenuation system. It has been developed using a Tungsten Carbide ceramic...

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Bibliographic Details
Published in:Review of scientific instruments 2014-07, Vol.85 (7), p.075003-075003
Main Authors: O'Toole, A, Peña Arellano, F E, Rodionov, A V, Shaner, M, Sobacchi, E, Dergachev, V, DeSalvo, R, Asadoor, M, Bhawal, A, Gong, P, Kim, C, Lottarini, A, Minenkov, Y, Murphy, C
Format: Article
Language:English
Subjects:
ACCELEROMETERS
BACKGROUND NOISE
CONSTRUCTION
Control equipment
DATA ACQUISITION
DESIGN
DISLOCATIONS
GRAVITATIONAL WAVES
High vacuum
HYSTERESIS
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
INTERFEROMETERS
Knife-edge
LASERS
Low frequencies
METALS
Microseisms
POLYCRYSTALS
PRESSURE RANGE MICRO PA
Scientific apparatus & instruments
Seismographs
SENSITIVITY
Tungsten carbide
TUNGSTEN CARBIDES
Wave attenuation
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Summary:A compact tilt accelerometer with high sensitivity at low frequency was designed to provide low frequency corrections for the feedback signal of the Advanced Laser Interferometer Gravitational Wave Observatory active seismic attenuation system. It has been developed using a Tungsten Carbide ceramic knife-edge hinge designed to avoid the mechanical 1/f noise believed to be intrinsic in polycrystalline metallic flexures. Design and construction details are presented; prototype data acquisition and control limitations are discussed. The instrument's characterization reported here shows that the hinge is compatible with being metal-hysteresis-free, and therefore also free of the 1/f noise generated by the dislocation Self-Organized Criticality in the metal. A tiltmeter of this kind will be effective to separate the ground tilt component from the signal of horizontal low frequency seismometers, and to correct the ill effects of microseismic tilt in advanced seismic attenuation systems.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4890285