Design of terahertz-wave Doppler interferometric velocimetry for detonation physics

Frequency division multiplexing for interferometric planar Doppler velocimetry.

A new method of acquiring simultaneously the signal and reference channels used for interferometric planar Doppler velocimetry is proposed and demonstrated. The technique uses frequency division multiplexing (FDM) to facilitate the capture of the requisite images on a single camera, and is suitable for time-averaged flow measurements. Furthermore, the approach has the potential to be expanded t...

Precisely tunable continuous-wave terahertz source with interferometric frequency control.

We realized a tunable continuous-wave terahertz source with megahertz frequency resolution. The system is based on optical heterodyning of two near-infrared distributed feedback diode lasers, each laser being stabilized by electronic feedback from a low-finesse quadrature interferometer. The control loop permits precisely linear laser frequency scans over >1200 GHz, and a beat signal linewidth ...

Laser Doppler Velocimetry

Thermographic laser Doppler velocimetry.

We propose a point measurement technique for simultaneous gas temperature and velocity measurement based on thermographic phosphor particles dispersed in the fluid. The flow velocity is determined from the frequency of light scattered by BaMgAl10O17:Eu2+ phosphor particles traversing the fringes like in conventional laser Doppler velocimetry. Flow temperatures are derived using a two-color rati...

Physics of Gravitational Wave Detection: Resonant and Interferometric Detectors

I review the physics of ground-based gravitational wave detectors, and summarize the history of their development and use. Special attention is paid to the historical roots of today’s detectors. *Supported by the National Science Foundation, under grant PHY-9602157 @ 1998 Peter R. Saulson.