Wavelength division sensing RF vibrometer for accurate measurement of complex vibrations

US9200945B2 · kind B2 · utility

Assignee

• University of Florida Research Foundation, INC. · US

Inventors

• Jenshan Lin · Pine Brook, US
• Yan Yan · Shanghai, CN
• Changzhi Li · Lubbock, US

Key dates

• Filing date: Dec 3, 2012
• Grant date: Dec 1, 2015
• Expiry date: Sep 17, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01H9/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Embodiments of the present invention provide a method for non-contact detection techniques of mechanical vibrations utilizing a radio frequency system incorporating multiple carrier wavelengths. The new detection method measures multiple harmonic pairs at a carrier frequency and improves the detection accuracy and reliability by first inspecting the Bessel function coefficient of each harmonic and then determining the harmonic amplitude. The original mechanical vibration can then be reconstructed. Embodiments can be used to realize sensing of complex non-sinusoidal vibrations using a wavelength division sensing technique and allow non-contact detection through walls, smoke, fog or other low visibility environments with the advantage of longer range detection and easy integration at a low cost.