TY  - JOUR
AU  - Meshksar, Neda
AU  - Mehmet, Moritz
AU  - Isleif, Katharina-Sophie
AU  - Heinzel, Gerhard
TI  - Applying Differential Wave-Front Sensing and Differential Power Sensing for Simultaneous Precise and Wide-Range Test-Mass Rotation Measurements
JO  - Sensors
VL  - 21
IS  - 1
SN  - 1424-8220
CY  - Basel
PB  - MDPI
M1  - PUBDB-2024-06397
SP  - 164 -
PY  - 2021
AB  - We propose to combine differential wave-front sensing (DWS) and differential power sensing (DPS) in a Mach-Zehnder type interferometer for measuring the rotational dynamics of a test-mass. Using the DWS method, a high sensitive measurement of 6 nrad Hz(-1/2) in sub-Hz frequencies can be provided around the test-mass nominal position (+/- 0.11 mrad), whereas the measurement of a wide rotation range (+/- 5 mrad) is realized by the DPS method. The interferometer can be combined with deep frequency modulation (DFM) interferometry for measurement of the test-mass translational dynamics. The setup and the resulting interferometric signals are verified by simulations. An optimization algorithm is applied to find suitable positions of the lenses and the waist size of the input laser in order to determine the best trade of between the slope of DWS, dynamic range of DPS, and the interferometric contrast. Our simulation further allows to investigate the layout for robustness and design tolerances. We compare our device with a recent experimental realization of a DFM interferometer and find that a practical implementation of the interferometer proposed here has the potential to provide translational and rotational test-mass tracking with state-of-the-art sensitivity. The simple and compact design, and especially the capability of sensing the test-mass rotation in a wide range and simultaneously providing a high-precision measurement close to the test-mass nominal position makes the design especially suitable for example for employment in torsion pendulum setups.
LB  - PUB:(DE-HGF)16
C6  - 33383766
UR  - <Go to ISI:>//WOS:000606087000001
DO  - DOI:10.3390/s21010164
UR  - https://bib-pubdb1.desy.de/record/616403
ER  -