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. 01, 1984
Filed:
Feb. 25, 1983
David A McNamara, Ypsilanti, MI (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
A transducer for converting a pressure variation to a variation in the frequency of a periodic function includes a reference oscillator and a sensor oscillator coupled to a digital mixer. The reference oscillator includes a reference capacitor and reference resistor for providing a reference periodic electrical signal having a frequency which is a function of the reference timing capacitor and reference resistor. Similarly, the sensor oscillator has a variable sensor timing capacitor and a sensor resistor for providing a sensor periodic electrical signal having a frequency which is a function of the variable sensor timing capacitor and sensor resistor. The digital mixer generates a mixed periodic electrical signal having a frequency proportional to the difference between the reference and sensor electrical signals. The transfer function of the transducer relates pressure and frequency and is adjustable by adjustment of the magnitude of the reference and sensor resistors.