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Figure 4
Diagram of the phase-sensitive detection (PSD) scheme used in the experiments. A sinusoidal varying excitation is added to a bias voltage used to set the piezo actuator. The filtered I0 signal is compared in phase with the excitation signal and its amplitude is measured. The output of a PID controller adjusts the bias voltage to keep the two monochromator crystals aligned optimally. The input of the PID controller is derived from the variation in the monochromator output as measured by an ion chamber.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 2| January 2014| Pages 401-408
doi:10.1107/S1600577513034747
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