Gravitational wave detection aims to measure extremely weak vibration signals that are deeply drowned in noise. Therefore, improving Signal to Noise Ratio (SNR) is crucial for such detection systems including laser interferometer gravitational wave observatory-LIGO.

In order to detect the vibration A which is induced on the Measuring Mass M by a certain astronomical event X, we deliberately add a reference vibration B. Then, we detect the combined vibration of A+B (instead A) on the Measuring Mass and study the cross-correlation between A+B vs. B. Most importantly, since A is extremely weak, we believe it is best to generate B using radiation pressure created by Reference Laser irradiation against M. In this case, we can easily change the characteristics of the Reference Laser by performing encode changes (pseudo randomly encoding for example) to modulate the Reference Laser’s frequency.

As we adjust the amplitude/frequency/phase of B to try to match A’s amplitude, frequency and phase (and/or opposite phase), our hypothesis is that the resulted resonances' peak can produce a much higher SNR performance.


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Published: 1 Mar, 2015

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