Huddle test measurement of a near Johnson noise limited geophone

Kirchhoff, R. et al. (2017) Huddle test measurement of a near Johnson noise limited geophone. Review of Scientific Instruments, 88(11), 115008. (doi: 10.1063/1.5000592) (PMID:29195374)

Abstract

In this paper, the sensor noise of two geophone configurations (L-22D and L-4C geophones from Sercel with custom built amplifiers) was measured by performing two huddle tests. It is shown that the accuracy of the results can be significantly improved by performing the huddle test in a seismically quiet environment and by using a large number of reference sensors to remove the seismic foreground signal from the data. Using these two techniques, the measured sensor noise of the two geophone configurations matched the calculated predictions remarkably well in the bandwidth of interest (0.01 Hz–100 Hz). Low noise operational amplifiers OPA188 were utilized to amplify the L-4C geophone to give a sensor that was characterized to be near Johnson noise limited in the bandwidth of interest with a noise value of 10−11 m/Hz⎯⎯⎯⎯⎯√10−11 m/Hz at 1 Hz.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Strain, Professor Kenneth
• Authors: Kirchhoff, R., Mow-Lowry, C. M., Adya, V. B., Bergmann, G., Cooper, S., Hanke, M. M., Koch, P., Köhlenbeck, S. M., Lehmann, J., Oppermann, P., Wöhler, J., Wu, D. S., Lück, H., and Strain, K.A.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Centre: College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
• Journal Name: Review of Scientific Instruments
• Publisher: AIP Publishing
• ISSN: 0034-6748
• ISSN (Online): 1089-7623
• Published Online: 21 November 2017
• Copyright Holders: Copyright © 2017 AIP
• First Published: First published in Review of Scientific Instruments 88(11):115008
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher