Back to results
US 12,345,627 B2Granted
Electromagnetic control of absorption and suppression of spectral artifacts
AssigneeServomex Group Limited
InventorsMichael Lawson, Martin Lopez, Bahram Alizadeh
Life of this patent
Estimating the term…
Abstract
A method and system for the suppression and/or modulation of absorption spectrum artifacts for the purpose of gas detection and concentration measurements using at least one magnetic, electric or electromagnetic field. A field applied selectively to at least one section of the system modulates absorption by influencing quantum energy state transitions of gas species.
Claims43
A method for gas detection and/or measurement in an absorption spectroscopy system, comprising:
- transmitting electromagnetic radiation from at least one source of electromagnetic radiation, along a transmission path through a gas sample in a measurement volume of an absorption spectroscopy system, towards at least one detector;
- flowing a purge gas to at least a first section of the absorption spectroscopy system, which gas-purged first section is isolated from the measurement volume but is within the transmission path of the electromagnetic radiation that is transmitted between the at least one source and at least one detector;
- applying at least one of an electric, magnetic or electromagnetic field to at least the gas-purged first section of the absorption spectroscopy system, thereby to suppress or modulate a spectral artefact resulting from absorption by at least one gas species within the purge gas;
- using the at least one detector to monitor absorption of electromagnetic radiation by the gas sample in the measurement volume, for at least one absorption wavelength or a wavelength range including one or more absorption wavelengths associated with at least one gas species, by detecting transmitted electromagnetic radiation that is not absorbed;
- and
- analysing an output signal from the at least one detector to determine the presence and/or measure a parameter of at least one gas species within the gas sample.
3 more elements
An apparatus for use in gas detection and/or measurement, comprising:
- a sample chamber for receiving a gas sample;
- at least one electromagnetic radiation source for transmitting electromagnetic radiation along a transmission path through the sample chamber towards at least one detector;
- at least a first gas-purged section of the apparatus that is connected to a source of purge gas, which first gas-purged section is isolated from the sample chamber but is within the transmission path of the transmitted electromagnetic radiation;
- at least one detector for monitoring absorption of electromagnetic radiation by the gas sample in the sample chamber, for at least one absorption wavelength or a wavelength range including one or more absorption wavelengths associated with a gas species, by detecting transmitted electromagnetic radiation that is not absorbed;
- at least one field generator arranged to apply at least one of an electric, magnetic or electromagnetic field to at least the first gas-purged section of the apparatus that is isolated from the sample chamber but is within the transmission path of the transmitted electromagnetic radiation between the at least one source and at least one detector;
- and
- a signal processor for analysing an output signal from the at least one detector to determine the presence of or measure a parameter of at least one gas species within the gas sample.
4 more elements
An absorption spectroscopy system, comprising:
- a sample chamber for receiving a gas sample;
- at least one electromagnetic radiation source for transmitting electromagnetic radiation along a transmission path through the sample chamber towards at least one detector;
- at least one field generator arranged to apply at least one of an electric, magnetic or electromagnetic field to at least a first section of the absorption spectroscopy system that is within the transmission path of the transmitted electromagnetic radiation between the at least one source and at least one detector;
- a spectroscopic measurement apparatus comprising at least one detector for monitoring absorption of electromagnetic radiation by the gas sample in the sample chamber, for at least one absorption wavelength or a wavelength range including one or more absorption wavelengths associated with a gas species, by detecting transmitted electromagnetic radiation that is not absorbed, and a signal processor for analysing an output signal from the at least one detector to measure a parameter of at least one gas species within the gas sample;
- at least one polariser to polarise electromagnetic radiation within a particular plane;
- wherein the at least one field generator is controllable to apply a field in each of a plurality of different applied field orientations with respect to the polarisation, for measuring a change in transmission through a gas sample of electromagnetic radiation at one or more wavelengths as a function of polarisation of an electromagnetic radiation source relative to the applied field, to determine a property of specific gas species and/or isotopologues or isotopomers of a measurand species, such as to determine pressure, temperature or concentration.
3 more elements
A method, for use in an absorption spectroscopy system, of measuring a change in transmission through a gas sample of electromagnetic radiation at one or more wavelengths, as a function of polarisation of an electromagnetic radiation source relative to the applied field, wherein the method comprises:
- transmitting electromagnetic radiation from at least one source of electromagnetic radiation, along a transmission path through a gas sample in a measurement volume of an absorption spectroscopy system, towards at least one detector, and using at least one polariser to polarise the electromagnetic radiation within a particular plane;
- applying at least one of an electric, magnetic or electromagnetic field to at least one section of the absorption spectroscopy system which is within the transmission path of the electromagnetic radiation that is transmitted between the at least one source and at least one detector, and controlling generation of the at least one applied field to apply a field in each of a plurality of different applied field orientations with respect to the polarisation;
- and
- measuring a change in transmission through a gas sample of electromagnetic radiation at one or more wavelengths, as a function of polarisation of the electromagnetic radiation relative to the applied field, thereby to determine a property of specific gas species and/or isotopologues or isotopomers of a measurand species, such as to determine pressure, temperature or concentration.
1 more element
A method for gas detection and/or measurement in an absorption spectroscopy system, comprising:
- transmitting electromagnetic radiation from at least one source of electromagnetic radiation, along a transmission path through a gas sample in a measurement volume of the absorption spectroscopy system, towards at least one detector;
- applying at least a first one of an electric, magnetic or electromagnetic field to at least a first section of the absorption spectroscopy system which section is isolated from the measurement volume but is within the transmission path of the electromagnetic radiation that is transmitted between the at least one source and at least one detector, wherein the applied field is used to shift the quantum energy state transitions of at least one gas species within the first isolated section of the absorption spectroscopy system, thereby to suppress or modulate a spectral artefact resulting from absorption by at least one gas species within the first isolated section;
- applying at least a second one of an electric, magnetic or electromagnetic field to at least a second section of the absorption spectroscopy system within the transmission path of the electromagnetic radiation, wherein the first and second fields differ from each other so as to differently modulate spectroscopic absorption by at least one gas species within the first and second sections;
- using the at least one detector to monitor absorption of electromagnetic radiation, for at least one absorption wavelength or a wavelength range including one or more absorption wavelengths associated with at least one gas species, by detecting transmitted electromagnetic radiation that is not absorbed;
- and
- analysing an output signal from the at least one detector to determine the presence and/or measure a parameter of at least one gas species within the gas sample.
3 more elements
Dependencies are inferred from the claim text.