Identifying multichannel coherent couplings and causal relationships in gravitational wave detectors

TL;DR

This paper introduces a correlation-based method to identify and analyze multichannel couplings and causal relationships in gravitational wave detectors, aiming to improve noise classification and mitigation for better signal detection.

Contribution

It presents a novel application of correlation coefficients to detect both linear and non-linear couplings in complex detector channels, aiding noise source identification.

Findings

Effective identification of noise sources like lightning, air compressors, and wind effects.

Improved noise classification enhances gravitational wave signal detection.

Method applicable to real-world detector noise analysis.

Abstract

The gravitational-wave detector is a complex and sensitive collection of advanced instruments that are impacted not only by mechanical/electronics systems but also by the surrounding environment. Hence, it is of great importance to classify and mitigate noises to detect gravitational-wave signals by using information from many auxiliary channels related to such devices and surroundings. This improves the signal-to-noise ratio and reduces false alarms from coincident loud events. For this reason, it is essential for identifying coherent relationships between complex channels. This study presents a way of identifying (non-) linear couplings between associated channels by using the method of correlation coefficients. And we show that the method can be applied to practical problems in the gravitational-wave detector, such as noises by lightning strokes, air compressors vibrations, and noises caused by wind effects.