Broadband thermal detector with a plurality of quarter-wave cavities
US12379254B2 · kind B2 · utility
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Key dates
| Filing date | Nov 11, 2024 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Nov 11, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/0813
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermal detector with a suspended absorbent membrane, which has at least two absorbers. The second absorber is designed to absorb the electromagnetic radiation in a spectral sub-band of a predefined spectral band, centered on a wavelength λc2. Moreover, it is spaced from a reflector by a value equal to λc2/4neq2 so as to form therewith a quarter-wave cavity for the wavelength λc2, the spectral sub-band being centered on the wavelength λc2 which is equal to λc1/2 within plus or minus 2 μm. Furthermore, the first and second absorbers have total surface areas such that a surface area ratio is between 0.5 and 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.