Broadband differential absorption sensor for detecting gaseous species
| DWPI Title: Remote absorption sensor for detecting species of interest e.g. in gaseous form in atmosphere, such as air, has processor that determines multiple species number densities along travel path of emitted pulse of radiation |
| Abstract: A remote sensor system comprising a laser transmitter that emits a pulse of broadband laser illumination comprising a plurality of wavelengths and a receiver configured to detect laser illumination backscatter. The sensor system further includes a computing system configured to determine a plurality of species number densities along a travel path of the laser illumination. Determining the plurality of species number densities includes determining a first number density of a first species based on a first set of optical transmission values from the backscatter data for a first subset of wavelengths of the plurality of wavelengths and a first attenuation cross-section of the first species. Additional species are determined based on additional sets of optical transmission values from the backscatter data for additional subsets of wavelengths of the plurality of wavelengths and additional cross-sections of additional species. |
| Use: Remote absorption sensor for detecting a species of interest e.g. in gaseous form in an atmosphere, such as air, water, and gas in remote source, such as a coaxial cable, Uses include but are not limited to fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies, such as infrared, radio, and microwave. |
| Advantage: The precision and accuracy of the measurement is improved, since the computing system is configured to determine species number densities for numerous types of gas phase molecules simultaneously. The noise in data collected by the receiver is reduced, since a change rate between wavelengths emissions is slower than change rate of the atmosphere. The accuracy and precision of the backscatter data are improved. |
| Novelty: The remote absorption sensor has a laser source emitting a pulse of radiation with a set of wavelengths. A receiver detects radiation backscatter based on the pulse of emitted radiation. A computing system is in communication with the laser source and the receiver. The computing system has a processor and a memory that stores computer-executable instruction that causes the processor to receive the data from the receiver. The receiver to determine species number densities along a travel path of the emitted pulse of the radiation. The processor determines a number density of a species based on optical transmission values from the data and an attenuation cross-section of the species. |
| Filed: 9/23/2021 |
| Application Number: US17482619A |
| Tech ID: SD 15571.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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