Sensor conditioning circuitry for use with electrically excited transducers
US5606515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1993 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Feb 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/021
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.