Modeling a calibrator for laser interferometer gravitational wave detectors

Abstract

Laser Interferometers Gravitational Wave detectors have more than 100 active attenuator systems, the normal methods for calibration seems to not work properly. This work aims to model a calibrator for this detector in the form of a resonant-mass Nb gravitational detector thar has the same sensitivity of LIGO detector bur operating in a narrow band. This detector will detect the same gravitational wave and use this signal to calibrate LIGO. A simulation in a lumped model is made and it shows that the calibration is achievable.

Measuring the speed of gravity at short distances: Sensitivity estimate

“…Previous works indicated (Fernandes et al 2018; Frajuca & Bortoli 2019) that the sensitivity of the system could be improved by changing the bar's shape. Frajuca et al (2021) proposed a different design for the emitters and the detector, broadening their bands to optimize the system; the normal modes of this broadband device are presented in Figure 3. The design consists of three sections in the device: two smaller bars at the extremities and a larger one between them; the central bar's length (represented by $$$ b $$$) is 0.63 m and the sidebar's is 0.30 m.…”