Electrical measurement circuit, gas detector and method for measuring a gas concentration
US10900935B2 · kind B2 · utility
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6References
19Claims
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Key dates
| Filing date | Sep 26, 2017 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Nov 14, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electric measurement circuit possesses an electrical reaction leg for forming an oscillator from a resonator, and furthermore possesses a measurement leg the input of which is supplied by the electrical reaction leg. The measurement leg contains an adjustable phase shifter so that an additional excitation force that is applied to the resonator in the measurement leg can be adjusted in phase quadrature with respect to an excitation force that is applied to the resonator in the electrical reaction leg. Such an electrical measurement circuit is particularly suitable for forming a photoacoustic gas detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.