Neutron diffractometers for strain scanning There are two principle different types of strain-scanner neutrondiffractometers.
High intensity is achieved by allowing frame-overlap.
The angularinformation, usually not used by tof-diffractometers, allows thereconstruction of the diffraction pattern from the multiple pulsespectrum. From this slope the time of flight of the neutron can becalculated with sufficient accuracy that the slit the neutronscame from is determined unambiguously. The position of the Bragg-line,finally, gives the exact value of the time of flight, and thereforethe lattice spacing. Description of the instrument back to top A sketch of the instrument is given in Fig. 1. The entrance slit of the chopperand the slits in the chopper itself have a width of 4mm and aheight of 35mm.