Sensor for detection of gas and method for detection of gas
Inventors
Rudmann, Dominik • Schumacher, Peter Matthias • Lang, Joseph • Caruel, Simon • Ellenberger-Girard, Christoph • Stanley, Ross • Eckert, Rolf • TIMOTIJEVIC, Branislav • Tormen, Maurizio
Assignees
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Publication Number
US-10307090-B2
Publication Date
2019-06-04
Expiration Date
Abstract
A sensor (1) for detection of gas, in particular for detection of CO2. The sensor (1) has a contact face (2) which can be directed towards a measuring site. The sensor (1) includes at least one radiation source (3), a measurement volume (4) for receiving the gas to be measured, and at least a first detector (5) for detection of radiation transmitted from the source (3) to the first detector (5) through the measurement volume (4). The sensor has a path (6) of the radiation between radiation source (3) and first detector (5). The radiation propagates along the path in a non-imaging way.
Core Innovation
The invention relates to a transcutaneous gas sensor for detection of transcutaneous gas. The sensor includes a contact face configured to be directed towards a measuring site and at least one gas diffusion path that brings gas to be measured into a measurement volume. The sensor further includes at least one radiation source for emission of measuring radiation and a detector for detection of electromagnetic radiation.
The detector is arranged with at least a first detection surface and a second detection surface and at least one wavelength sensitive element. The wavelength sensitive element is substantially transparent for radiation of a first wavelength band incident onto the wavelength sensitive element in a first range of incidence angles, and it is substantially transparent for radiation of a second wavelength band incident onto the wavelength sensitive element in a second range of incidence angles. The first and second wavelength bands are at least partly different, and the first and second ranges of incidence angles are at least partly different.
The arrangement is defined so that radiation in the first wavelength band propagates through the wavelength sensitive element such that the radiation of the first wavelength band impinges on the first detection surface and is detectable by the first detection surface. In the same way, radiation of the second wavelength band propagates through the wavelength sensitive element such that the radiation of the second wavelength band impinges on the second detection surface and is detectable by the second detection surface. The sensor architecture also supports bias reduction by using signal and reference radiation paths and non-imaging radiation propagation through a small measurement volume.
The disclosed embodiments further describe compact detector structures with sealed or isolated compartments and channels around optical and gas volumes, and optical surfaces arranged to improve measurement accuracy. Condensation mitigation is supported by water traps and/or desiccants, and gas exchange with the environment is provided via an exchange channel together with gas diffusion paths. Optionally, a gas collector is configured with a collection area greater than an access area to the measurement volume.
Claims Coverage
The document provides one explicit independent claim (clm-00001). It contains three core inventive features centered on transcutaneous gas detection using a non-imaging measurement volume, a detector with two detection surfaces, and a wavelength sensitive element that provides wavelength-band discrimination via incident-angle ranges.
Transcutaneous gas sensor with gas diffusion path and measurement volume
A sensor for detection of transcutaneous gas comprising a contact face configured to be directed towards a measuring site, at least one gas diffusion path, a measurement volume for receiving the gas to be measured, at least one radiation source for emission of measuring radiation, and a detector for detection of electromagnetic radiation.
Wavelength sensitive element with incidence-angle dependent transparency for two wavelength bands
The detector comprises at least one wavelength sensitive element that is substantially transparent for a first wavelength band incident in a first range of incidence angles and substantially transparent for a second wavelength band incident in a second range of incidence angles, where the first and second wavelength bands are at least partly different and the first and second ranges of incidence angles are at least partly different.
Two detection surfaces arranged to detect respective wavelength bands
The first detection surface and the second detection surface and the at least one wavelength sensitive element are arranged such that first-wavelength-band radiation propagates through the wavelength sensitive element and impinges on the first detection surface for detection, and second-wavelength-band radiation propagates through the wavelength sensitive element and impinges on the second detection surface for detection.
Overall, clm-00001 is directed to a transcutaneous gas sensor whose detector uses a wavelength sensitive element that is substantially transparent for two wavelength bands in two different incidence-angle ranges, in combination with first and second detection surfaces that respectively receive and detect the first- and second-wavelength-band radiation.
Stated Advantages
Miniaturization.
Relaxed manufacturing tolerances due to non-imaging/random-walk optics.
Improved accuracy via reflective optical surfaces and sealed/isolated compartments/channels.
Faster response via reduced accessible gas volume.
Condensation mitigation via water traps/desiccants.
Optional gas collector configuration with a collection area greater than an access area.
Documented Applications
No documented applications found
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