A solar Stokes spectrum telescope

A solar Stokes spectrum telescope has been built and is routinely used to m easure full Stokes spectra of solar surface features. Its optical and elect ronic systems are outlined while the polarization analyzer is described in detail. The observations carried out by this telescope are sampled and the performance parameters are given. The measured Stokes spectra during solar cycle 23 show that the measurement accuracy of Stokes polarization componen ts can reach an r.m.s. noise level of less than 9.0x10(-4) with short time integration for an active region and 5.0x10(-4) with long time integration for a weak field region without smoothing.