79 citations · 338 across the 14 of their papers we have counts for
5 papers · 1 filter
A Cryogenic Torsion Balance Using a Liquid-Cryogen Free, Ultra-Low Vibration Cryostat
S. M. Fleischer, M. P. Ross, K. Venkateswara +5
We describe a liquid-cryogen free cryostat with ultra-low vibration levels which allows for continuous operation of a torsion balance at cryogenic temperatures. The apparatus uses…
A Low-Frequency Torsion Pendulum with Interferometric Readout
M. P. Ross, K. Venkateswara, C. A. Hagedorn +6
We describe a torsion pendulum with a large mass-quadrupole moment and a resonant frequency of 2.8 mHz, whose angle is measured using a modified Michelson interferometer. The syste…
A high-precision mechanical absolute-rotation sensor
Krishna Venkateswara, Charles A. Hagedorn, Matthew D. Turner +2
We have developed a mechanical absolute-rotation sensor capable of resolving ground rotation angle of less than 1 nrad above mHz and 0.2 nrad$/\sqrt{\text{H…
A reference-beam autocollimator with nanoradian sensitivity from mHz to kHz and dynamic range of 10^7
T. B. Arp, C. A. Hagedorn, S. Schlamminger +1
We describe an autocollimating optical angle sensor with a dynamic range of 9 mrad and nrad/sqrt(Hz) sensitivity at frequencies from 5 mHz to 3 kHz. This work improves the standard…
Picoradian deflection measurement with an interferometric quasi-autocollimator using weak value amplification
Matthew D. Turner, Charles A. Hagedorn, Stephan Schlamminger +1
We present an "interferometric quasi-autocollimator" that employs weak value amplification to measure angular deflections of a target mirror. The device has been designed to be ins…