What instrumentation is required to detect gravitational waves?

Answer 1

Laser interferometers were used in LIGO.

More powerful and lengthy space based LISA is being planned and executed
lisa pathfinder the first satellite to test the space based intertferometer was launched in 2015..by ESA.

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Answer 2

Nolan Aldridge

Lasers are used to measure the distance between mirrors, and sophisticated detectors are used to capture minute changes in the length of the arms caused by passing gravitational waves. Two examples of such detectors are the Virgo interferometer and the Laser Interferometer Gravitational-Wave Observatory (LIGO). Interferometers are extremely sensitive instruments that are used to detect gravitational waves.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.