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Spin-echo instruments are typically used to measure diffusive processes andthe dynamics and motion in samples on ps and ns timescales. A key aspect of thespin-echo technique is to determine the polarisation of a particle beam. Wepresent two methods for measuring the spin polarisation in spin-echoexperiments. The current method in use is based on taking a number of discretereadings. The implementation of a new method involves continuously rotating thespin and measuring its polarisation after being scattered from the sample. Acontrol system running on a microcontroller is used to perform the spinrotation and to calculate the polarisation of the scattered beam based on alock-in amplifier. First experimental tests of the method on a helium spin-echospectrometer, show that it is clearly working and that it has advantages overthe discrete approach i.e. it can track changes of the beam propertiesthroughout the experiment. Moreover, we show that real-time numericalsimulations can perfectly describe a complex experiment and can be easily usedto develop improved experimental methods prior to a first hardwareimplementation.

Polarisation in Spin-Echo Experiments: Multi-point and Lock-in Measurements