Yoichi Aso et al 2009 Class. Quantum Grav. 26 055010 doi:10.1088/0264-9381/26/5/055010
Accurate measurement of the time delay in the response of the LIGO gravitational wave detectors
Yoichi Aso1,2, Evan Goetz3, Peter Kalmus1, Luca Matone1, Szabolcs Márka1, Joshua Myers5, Brian O'Reilly4, Rick Savage5, Paul Schwinberg5, Xavier Siemens6, Daniel Sigg5 and Nicolas Smith7
Show affiliationsWe present a method to precisely calibrate the time delay in a long baseline gravitational-wave interferometer. An accurate time stamp is crucial for data analysis of gravitational wave detectors, especially when performing coincidence and correlation analyses between multiple detectors. Our method uses an intensity-modulated radiation pressure force to actuate on the mirrors. The time delay is measured by comparing the phase of the signal at the actuation point with the phase of the recorded signal within the calibrated data stream used for gravitational wave searches. Because the signal-injection path is independent of the interferometer's control system, which is used for the standard calibration, this method can be an independent verification of the timing error in the system. A measurement performed with the 4 km interferometer at the LIGO Hanford Observatory shows a 1 µs relative accuracy when averaging over 50 min. Our understanding of the systematic time delay in the detector response has reached the level of 10 µs.
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- Dates
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Issue 5 (7 March 2009)
Received 8 September 2008, in final form 28 December 2008
Published 17 February 2009
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Accurate measurement of the time delay in the response of the LIGO gravitational wave detectors
Yoichi Aso et al 2009 Class. Quantum Grav. 26 055010
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