Volume-pressure relationships during development of mineralocorticoid hypertension in man.

Abstract

Photonics-based multi-band radars have been demonstrated where photonics is exploited for multiple RF signal generation and detection by means of a single optical local oscillator that replaces the conventional cascades of electrical local oscillators. The ultra-wide band and high stability of photonics and the use of a single local oscillator assure very low system phase noise and phase coherence among the RF signals. This phase coherence among multi-band signals is exploited to perform differential phase estimation in enhanced sub-millimeter displacement measures. The system employs stepped frequency continuous waves simultaneously in the S- and X-band, measuring the differential phase over a frequency span up to 7.4GHz. The high coherence among the two frequency bands, provided by the photonic architecture, enables very precise displacements measures, allowing to obtain sub-millimeter precision without using correction algorithms.