Ranging and phase measurement for LISA

Capacitance Position Sensor for LISA Noise Measurement

This paper discusses two techniques investigated for use in a capacitance-based position sensor for the Eöt-Wash LISA noise measurement. The advantages and disadvantages of both techniques are reviewed and some elementary mathematical analysis is presented. A prototype implementation based on the more successful of the two techniques has been constructed.

Experimental demonstration of weak-light laser ranging and data communication for LISA.

Interferometric gravitational wave detectors with an unequal and time-varying arm length configuration like the Laser Interferometer Space Antenna rely on time-delay interferometry (TDI) for laser frequency noise subtraction. However, the TDI algorithm requires a laser ranging scheme with meter accuracy over a five million kilometer arm length. At the end of each arm only about 100 pW of light ...

Two-mode interference measurement for nanometer accuracy absolute ranging.

We demonstrate a laser ranging scheme that uses a high-frequency modulated beam to achieve subnanometer precision by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular, we show that the signal, which presents both optical and synthetic wavelength scales, allows one to ac...

Detection of UWB ranging measurement quality for collaborative indoor positioning

Phase-Shifting Interferometry for RF Phase Measurement

This paper introduces an interferometric technique for the phase measurement of microwave devices. A handheld vector network analyzer (VNA) is presented for HF and VHF applications. A wideband synthesizer with multiple synchronized outputs is developed for extending the frequency range to the microwave band. The phase differences between the output signals can be set digitally with sub-degree a...