High speed AC sensor phase measurement
US10801863B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2019 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Feb 19, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for determining a phase angle of a sensor waveform relative to an excitation waveform includes a controller that provides an excitation signal having an excitation frequency and a sample signal having four times the excitation frequency. An exciter provides a sinusoidal excitation waveform at the excitation frequency to a primary winding, thereby inducing a sensor waveform in a secondary winding. An analog-to-digital converter (ADC) measures a first and second voltage of the sensor waveform separated in time by the period of the sample frequency, and a wrap-around ADC measures a first and second voltage of the sinusoidal excitation waveform. The first voltage measurements are made at the same time, and the second voltage measurements are made at the same time. The system calculates the phase angle based on the first voltage measurements and the second voltage measurements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.