2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167719We demonstrate that speedmeter, based on double pumped resonant Sagnac interferometer, can be used as a displacement noise free gravitational-wave (GW) detector. The displacement noise of cavity mirrors can be completely excluded through a proper linear combination of the output signals. We show that in low-frequency region the obtained displacement-noise-free response signal is stronger than the one in previously proposed displacement noise free interferometers.7 pages, 3 figuresGeneral Relativity and Quantum Cosmologytext