Electromagnetic control of absorption and suppression of spectral artifacts
AssigneeServomex Group Limited
InventorsMichael Lawson, Martin Lopez, Bahram Alizadeh
Life of this patent
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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.
Claims44
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 an absorption spectroscopy system, towards at least one detector;
- applying at least one of an electric, magnetic or electromagnetic field to at least one section of the absorption spectroscopy system which section is isolated from the gas sample but is within the transmission path of the electromagnetic radiation that is transmitted between the at least one source and at least one detector, thereby to suppress or modulate a spectral artifact resulting from absorption by at least one gas species within the at least one section;
- using the at least one detector to monitor absorption of electromagnetic radiation for at least one absorption wavelength or wavelength range 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.
An apparatus for use in gas detection and/or measurement, comprising:
- at least one electromagnetic radiation source for transmitting electromagnetic radiation along a transmission path through a gas sample within a gas detection and/or measurement system towards at least one detector;
- at least one detector for monitoring absorption of electromagnetic radiation for at least one absorption wavelength or wavelength range 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 one section of the gas detection and/or measurement system that is isolated from the gas sample 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.
An absorption spectroscopy system, comprising means for measuring a change in transmission through a gas sample of electromagnetic radiation at one or more wavelengths, as a function of applied field strength or 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.
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 applied field strength or 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.
Dependencies are inferred from the claim text.