Accurate methane detection using tuned lidar modulation
US12253466B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Sep 6, 2024 |
| Grant date | Mar 18, 2025 |
| Priority date | — |
| Expiry date | Sep 6, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/399
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of gas detection comprises emitting radiation of different wavelengths across the absorption spectrum of a gas towards a target area; and analysing the spectrum of returned radiation from the target area to identify the gas in the target area using the time correlation of the emitted radiation and the returning radiation. The radiation is modulated using respective modulation codes for the different wavelengths and the modulation codes are modified by the insertion of a gap between each bit of the modulation code, the gap having a duration of at least n−1 bits where n is the number of different wavelengths.
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