Optogalvanic effect detection system
US11525804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2018 |
| Grant date | Dec 13, 2022 |
| Priority date | — |
| Expiry date | Feb 12, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0027
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optogalvanic effect (OGE) detection system utilizes an intracavity sample cell and a circuit that provides low noise stable excitation and maintenance of a radio frequency (rf) driven gas discharge within the sample cell and a direct current output proportional to the if driving voltage, associated monitoring devices and software. When an optical stimulus interacts with the discharge, any electrical change in the discharge can be simply determined with high precision and accuracy by measuring the impedance of the discharge via a measurement of the direct current output. In a preferred embodiment the rf gas discharge is created with a series resonant oscillator with two push pull sections connected together to generate the high voltage signal. A current source provides a low noise stable current to power the oscillator sections. A band pass amplifier filters the current of the discharge prior to measuring it.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.