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:
Feb. 25, 1997
Filed:
Feb. 03, 1993
Robert F Mockapetris, Weymouth, MA (US);
Fred L Lehman, Sharon, MA (US);
Instron Corporation, Canton, MA (US);
Abstract
Circuitry that is used to determine the strain of a component and includes a waveform random access memory that stores excitation digital data that represent values of an excitation waveform, a digital-to-analog converter to convert the digital data to an analog excitation signal, a strain sensing transducer that receives the excitation signal and generates an analog response signal, an analog-to-digital converter that digitizes the transducer response signal, a demodulator that multiplies the digital response signal times phase adjusted values of the excitation digital data stored in the waveform memory and low-pass filters the digital response signal, and a resistance-to-voltage converter connected to present a voltage indicating the resistance of an identifying resistor to the analog-to-digital converter. Also disclosed are the use of a serial data transmission line to transmit multiplexed excitation waveform data from a host to a plurality of slave sensor conditioning boards and a calibration technique for calculating a phase shift angle for the demodulator.