Advanced Approaches in Mössbauer Drive Modelling and Controller Design Reducing System Order and Increasing Robustness

The Mössbauer spectroscopy or also known as Gamma ray resonance spectroscopy based on the Mössbauer effect has not only proven itself in the form of the MIMOS II (miniaturised Mössbauer spectrometer) as a reliable measuring instrument for planetary exploration with a service life of several years on Mars, but also offers a wide range of popular applications on Earth with many applications in industry, science, art and much more. An important component of the Mössbauer spectrometer is the Mössbauer drive, which allows, utilizing the Doppler effect, to vary the amount of energy of the emitted gamma quanta so that it corresponds to the resonance energy and energetically excites the irradiated nuclei. This paper deals with drive modelling and control in Mössbauer spectroscopy. For the first time, a single-mass model is used instead of the previously common three-mass model, as in this context only the momentum mass of the drive is the focus of the regulation. After modeling and determining important characteristics such as natural frequency and damping behavior of the unregulated system, three control algorithms are developed and compared. First, there is a PID controller design. Second, there is a feasible heuristic filtering method with subsequent normalization. Third, there is a simulated state-space model with the associated state feedback. All approaches yield good results and can be further evaluated in a practical environment. The heuristic control concept fundamentally revises common design approaches and opens up a broad spectrum of research. The controller design provides for a combination of signal-smoothing and signal-amplifying low-pass filtering in combination with dynamic input vector normalisation. This achieves the desired frequency and amplitude response of and 0.3 mm and optimises the dynamics for real laboratory use.