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:
Mar. 30, 1993
Filed:
Feb. 22, 1991
Applicant:
Inventor:
Mark E Spencer, Mesa, AZ (US);
Assignee:
Sentech Corp., Tempe, AZ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ; G01R / ; G01N / ; G01V / ;
U.S. Cl.
CPC ...
32420726 ; 324202 ; 32420716 ; 324234 ; 324236 ; 324654 ; 331 65 ;
Abstract
A position detection method and apparatus is disclosed which utilizes an electromagnetic probe as the control element in a relaxation oscillator circuit. The probe is energized by a pulse voltage waveform and the decay time of the induced transient probe voltage is utilized to modulate the frequency of the pulse generator. The probe transient voltage decay time is influenced by the proximity of an electrically conductive or magnetic object. Therefore, a frequency output is generated which indicates the position of the conductive or magnetic object.