Method for measuring API gravity of petroleum crude oils using angle-resolved fluorescence spectra
US11662288B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2020 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Sep 2, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/6465
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods include a fluorescence measurement apparatus. A single-wavelength light source generates an excitation light source. A sample holder holds a sample and includes a surface transparent to the excitation light source. Mounts attached to the single-wavelength light source(s) or the sample holder change an incident angle of the excitation light source on the surface. Optical components positioned in a path of a fluorescence emission emitted from the surface guide the fluorescence emission to a detector that obtains spectra from at least first and second angles-of-incidence. A device records spectra obtained by the detector from the first and second angles-of-incidence, normalizes and analyzes intensities of the spectra, subtracts a first spectrum corresponding to the first angle-of-incidence from a second spectrum corresponding to the second angle-of-incidence to obtain a difference, identifying a sample type of the sample based on an API gravity mapped to the difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.