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:
Nov. 04, 1997
Filed:
Mar. 28, 1995
Noe Arcas, Plainview, NY (US);
Charles A Parente, Oyster Bay, NY (US);
Shepard G Kay, Merrick, NY (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
A portable two microphone acoustic impedance data acquisition and analysis system provided in a lightweight, fully portable, battery powered instrument with a dual capability of either on-site or remote-site analysis of measured data on the acoustic impedance of acoustically absorbing duct liners of aircraft jet engines. The fully portable instrument is capable of being operated by relatively unskilled personnel to provide acoustic impedance and non-linearity measurements on acoustic liners at airports and aircraft maintenance facilities. The measured data on the engine duct acoustic liner can be an input directly to the data analysis system at the data acquisition site for on-site analysis, or can be recorded for input to a data analysis system at a later time, or can be recorded and transmitted, such as by a telephone modem, to a data analysis system at a remote-site. The remote-site analysis of data eliminates the requirement for skilled personnel at the aircraft to perform the relatively complex data analysis procedures.