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In diesem Bericht werden Berechnungen und Simulationen von elektronischen Schaltungen zur Messung einzelner Photonen mit herkömmlichen pin-Fotodioden vorgestellt. Dabei sind hohe Bandbreite und geringes Rauschen in den Vordergrund gestellt.
Grundsätzlichen Betrachtungen zum Verhalten einer beispielhaften Fotodiode und zur Signalverarbeitung mit Bandpässen sind eigene Kapitel gewidmet. Eine vollständige Schaltung zur Ermittlung der Energie einzelner Photonen wird vorgestellt und mit LTspice simuliert.
The miniaturized Mössbauer-spectrometer (MIMOS II), originally devised by Göstar Klingelhöfer, is further developed by the Renz group at the Leibniz University Hanover in cooperation with the Hanover University of Applied Sciences and Arts. A new processing unit with a two-dimensional (2D) data acquisition was developed by M. Jahns. The advantage of this data acquisition is that no thresholds need to be set before the measurement. The energy of each photon is determined and stored with the velocity of the drive. After the measurement, the relevant area can be selected for the Mössbauer spectrum. Now we have expanded the evaluation unit with a power supply for a MIMOS drive and a MIMOS PIN detector. So we have a very compact MIMOS transmissions measurement setup. With this setup it is possible to process the signals of two detectors serially. Currently we are working on a parallel signal processing.