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At present a 10\,m prototype interferometer facility is being set up at theAEI Hannover. One unique feature of the prototype will be the suspensionplatform interferometer (SPI). The purpose of the SPI is to monitor andstabilise the relative motion between three seismically isolated opticaltables. The in-vacuum tables are suspended in an L-shaped configuration with anarm length of 11.65\,m. The design goal of the SPI is to stabilise longitudinaldifferential displacements to a level of 100\,pm/$\sqrt{\mathrm{Hz}}$ between10\,mHz and 100\,Hz and relative angular noise of 10\,nrad/$\sqrt{\mathrm{Hz}}$in the same frequency band. This paper covers the design aspects of the SPI,e.g. cross-coupling between the different degrees of freedom and fibre pointingnoise are investigated. A simulation is presented which shows that with thechosen optical design of the SPI all degrees of table motion can be sensed in afully decoupled way. Furthermore, a proof of principle test of the SPI sensingscheme is shown.

Suspension platform interferometer for the AEI 10\,m prototype: concept, design and optical layout