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The next part of the challenge was to take diffraction measurements only when a ball in the bearing was in the correct position below the measurement point on the raceway. To do this, the detector has a “gate” in the data collection electronics. The gate is used so that the detector only counts X-rays when a signal is received from an external sensor. To provide the gate signal, the researchers fitted a proximity sensor to the rotating bearing, so that the detector could be set to collect data only when a ball was in the correct position.
A full description of the work can be found in the article in the Journal “Strain” . The concept of the stroboscopic technique was previously proved in an experiment to measure stresses inside a running motorbike engine . A paper describing the I12 beamline is also available .
 M. Mostafavi D. M. Collins M. J. Peel C. Reinhard S. M. Barhli R. Mills M. B. Marshall R. S. Dwyer‐Joyce T. Connolley (2017), “Dynamic contact strain measurement by time‐resolved stroboscopic energy dispersive synchrotron X‐ray diffraction”. Strain 53: e12221. doi: 10.1111/str.12221.
 N. Baimpas, M. Drakopoulos, T. Connolley, X. Song, C. Pandazaras and A. M. Korsunsky (2013), “A feasibility study of dynamic stress analysis inside a running internal combustion engine using synchrotron X-ray beams” J. Synchrotron Rad. 20: 316-323. doi: 10.1107/S0909049513000885
 Michael Drakopoulos , Thomas Connolley , Christina Reinhard , Robert Atwood , Oxana Magdysyuk , Nghia Vo , Mike Hart , Leigh Connor , Bob Humphreys , George Howell , Steve Davies , Tim Hill , Guy Wilkin , Ulrik Pedersen , Andrew Foster , Nicoletta De Maio , Mark Basham, Fajin Yuan , Kaz Wanelik (2015) “I12: the Joint Engineering, Environment and Processing (JEEP) beamline at Diamond Light Source” Journal Of Synchrotron Radiation 22: 828-838. doi: 10.1107/S1600577515003513
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