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:
May. 22, 1990
Filed:
Jan. 10, 1989
Applicant:
Inventors:
Assignee:
Powertech Labs, Inc., Surrey, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73579 ; 364578 ;
Abstract
A method of determining the stiffness and condition on a wooden structure. The method consists of initiating the natural vibration of the structure in a band of frequencies that cover at least two of the first five resonant modes of vibration. An electrical response equivalent to the vibration motion of the structure is generated and the electrical response is converted to a digital signal. The resonant frequency of the structure is calculated by analysing the digital signal. By comparing the results with the results obtained using a mathematical model the stiffness and condition of the structure is determined.