Add all bibliographic notes and zettels

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+title = "An instrument for 3d x-ray nano-imaging"
+author = ["Dehaeze Thomas"]
+draft = false
+++
+
+Tags
+: [Nano Active Stabilization System]({{< relref "nano_active_stabilization_system.md" >}}), [Positioning Stations]({{< relref "positioning_stations.md" >}})
+
+Reference
+: (<a href="#citeproc_bib_item_1">Holler et al. 2012</a>)
+
+Author(s)
+: Holler, M., Raabe, J., Diaz, A., Guizar-Sicairos, M., Quitmann, C., Menzel, A., &amp; Bunk, O.
+
+Year
+: 2012
+
+Instrument similar to the NASS.
+Obtain position stability of 10nm (standard deviation).
+
+<a id="figure--fig:holler12-station"></a>
+
+{{< figure src="/ox-hugo/holler12_station.png" caption="<span class='figure-number'>Figure 1: </span>Schematic of the tomography setup" >}}
+
+-   **Limited resolution due to instrumentation**:
+    The resolution of ptychographic tomography remains above 100nm due to instabilities and drifts of the scanning systems.
+-   **Need of a Metrology System**:
+
+    > To achieve positioning accuracy and stability in the nanometer range, one cannot rely on the position encoders built into individual positioning stages.
+    > A precise exteroceptive measurement of the relative position of the optical elements with respect to the sample is mandatory.
+    > Thus, thermal drifts and parasitic motions can be measured and compensated for.
+-   **Interferometer System Concept**:
+    The sample is aligned with the X-ray with the XYZ piezo stage.
+    As a result, the metrology sphere will be usually off center with respect to the rotation axis of the spindle.
+    That implies that the laser will not propagate back to the interferometer at all rotation angles.
+    A position sensitive detector (PSD) is used, it provides a measurement of the position of the sphere in the plane perpendicular to the laser.
+    The interferometer is positionned on top of a translation stage. The PSD information is used to close the loop so that the interferometer follows the displacement of the metrology sphere.
+-   **Feedback Loop**: Using the signals from the 2 interferometers, the loop is closed to compensate low frequency vibrations and thermal drifts.
+
+
+## Bibliography {#bibliography}
+
+<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
+  <div class="csl-entry"><a id="citeproc_bib_item_1"></a>Holler, M., J. Raabe, A. Diaz, M. Guizar-Sicairos, C. Quitmann, A. Menzel, and O. Bunk. 2012. “An Instrument for 3d X-Ray Nano-Imaging.” <i>Review of Scientific Instruments</i> 83 (7): 073703. doi:<a href="https://doi.org/10.1063/1.4737624">10.1063/1.4737624</a>.</div>
+</div>