The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2011
Filed:
Dec. 30, 2008
Sudhir Trivedi, Baltimore, MD (US);
Venkataraman Swaminathan, Bridgewater, NJ (US);
Chen-chia Wang, Newark, DE (US);
Sudhir Trivedi, Baltimore, MD (US);
Venkataraman Swaminathan, Bridgewater, NJ (US);
Chen-Chia Wang, Newark, DE (US);
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Abstract
An enhanced sensitivity laser vibrometer with increased output signal strength and more sensitive surface vibration detection, is provided by using a reflective mirror assembly to repeatedly bounce the sensing laser beam against the acoustic pressure-sensing diaphragm to magnify the acoustic incident pressure wave being detected. The enhancement in signal strength, in terms of power spectral density, is a function of the number of bounces squared and the detection of surface vibrations with a displacement of smaller than 4 picometers is demonstrated experimentally.