What is calculated?
Textbook: In the idealised long-wavelength, optimally oriented response, differential length ΔL = hL. The reflected-light phase difference is Δφ = (4π/λ)ΔL. Fringe shift N = Δφ/(2π) = 2ΔL/λ. The round-trip light time is 2L/c, using c = 299,792,458 m/s.
Independent check: Phase is separately computed using path difference ΔOPL = 2hL, followed by Δφ = 2πΔOPL/λ. Agreement tests the arithmetic, not the accuracy of a detector model.
Simplified educational representation: Assumes uniform strain amplitude and an ideal Michelson configuration. It omits arm-cavity dynamics, antenna response, quantum noise, thermal noise, optical losses, and feedback control.
Engineering-inspired reconstruction: Vessels, multi-stage suspensions, beams, seismic supports, electronics, and maintenance systems are generic, not a reproduction of any actual facility.
Illustrative: Laser glow, moving photons, component movement, arm lengths drawn in the scene, and operation motion are exaggerated and not a validated physical simulation. No speculative sensing performance is claimed.
Illustrative design, not affiliated with any real institution or manufacturer.
Keyboard: F fits all, G starts assembly, 1–5 changes views, Space toggles animation. Displayed displacements are not visual-scale motion.