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Assignees
Member
Glycos Biomedical LtdWe are UK/US entity with a team based in Maryland and North Carolina comprising an expert team that has linked triggers to disease states including TBI and acute injuries associated with radiation, acute lung injury and infection.
We are UK/US entity with a team based in Maryland and North Carolina comprising an expert team that has linked triggers to disease states including TBI and acute injuries associated with radiation, acute lung injury and infection.
Publication Number
US-12625068-B2
Publication Date
2026-05-12
Expiration Date
Abstract
An optical device includes: an analysis optical system; and a length measurement optical system. The analysis optical system includes a moving mirror configured to reflect analysis light to add a first modulation signal to the analysis light, a gas cell with a gas that absorbs light of a predetermined wavelength sealed therein and configured to add a light absorption signal to the analysis light, and a first light receiving element configured to receive the analysis light including a sample-derived signal, the first modulation signal, and the light absorption signal. The length measurement optical system includes a second light source and obtains a displacement signal corresponding to a position of the moving mirror using laser light.
Core Innovation
The invention relates to an optical device for Fourier-transform spectroscopy that combines an analysis optical system and a length measurement optical system. The analysis optical system includes a moving mirror configured to reflect analysis light emitted from a first light source to add a first modulation signal to the analysis light, and a sealed gas cell with a gas that absorbs light of a predetermined wavelength, so that the gas cell adds a light absorption signal to the analysis light.
The optical device uses a first light receiving element configured to receive the analysis light and output a first light receiving signal including a sample-derived signal generated by a sample, the first modulation signal, and the light absorption signal. The length measurement optical system includes a second light source configured to emit laser light, and obtains a displacement signal corresponding to a position of the moving mirror using the laser light.
The spectroscopic processing converts the received interferometric signal into an interferogram, performs Fourier transform to generate a spectral pattern, and uses the gas-cell-derived absorption peak within the spectral pattern. A moving-mirror position correction is computed from a peak wavelength difference compared to a fundamental wavelength of the gas cell, and a correction value is applied to correct the wavenumber axis. Embodiments also include transmission versus reflection configurations, incidence switching, wavelength conversion elements, optical heterodyne length measurement, and an optical modulator-based length measurement configuration.
Claims Coverage
Independent claim clm-00001 covers an optical device architecture integrating an analysis optical system and a length measurement optical system, with inventive features comprising a moving mirror modulation, a sealed absorption-based reference gas cell, a combined received signal including sample-derived and absorption components, and a laser-based displacement measurement of mirror position. Dependent claim refinements further specify spectroscopic processing with Fourier transform and absorption-peak-based correction, incidence switching behavior, wavelength conversion, and the second light source being a semiconductor laser element.
Integrated optical device with analysis system and length measurement system
An optical device comprising an analysis optical system and a length measurement optical system.
Moving mirror adds modulation signal to analysis light
The analysis optical system includes a moving mirror configured to reflect analysis light emitted from a first light source to add a first modulation signal to the analysis light.
Sealed absorbing gas cell adds absorption-based reference signal
A gas cell with a gas that absorbs light of a predetermined wavelength sealed therein and configured to add a light absorption signal to the analysis light.
First light receiving signal includes sample-derived, modulation, and absorption contributions
A first light receiving element configured to receive the analysis light including a sample-derived signal generated by a sample, the first modulation signal, and the light absorption signal, and output a first light receiving signal.
Laser-based displacement signal for moving mirror position
The length measurement optical system includes a second light source configured to emit laser light and obtains a displacement signal corresponding to a position of the moving mirror using the laser light.
Fourier transform spectral pattern with absorption-peak-based mirror correction
A spectroscopic method that measures the moving-mirror position from the displacement signal, performs Fourier transform to obtain a spectral pattern with an absorption-based peak, calculates a correction value from the peak wavelength difference relative to the gas cell’s fundamental wavelength, and corrects the wavenumber axis.
Incidence switching between gas-cell-only and sample-only illumination
An incidence switching unit configured to switch the analysis light between a state incident on the gas cell only and a state incident on the sample only.
Switching by inserting and removing the gas cell
The incidence switching unit switches between the first state and the second state by inserting and removing the gas cell.
Wavelength conversion element in the analysis optical system
The analysis optical system includes a wavelength conversion element configured to convert a wavelength of the analysis light emitted therefrom with respect to the analysis light incident thereon.
Semiconductor laser element as the second light source
The second light source is a semiconductor laser element.
Overall claim coverage centers on combining moving-mirror modulation and a sealed absorption-based reference gas cell in an analysis optical system, with laser-based displacement measurement of the moving mirror. Dependent claim refinements add Fourier-transform spectral processing using an absorption peak to calculate a mirror-position correction from a wavelength difference, as well as incidence switching, wavelength conversion, and specifying the second light source as a semiconductor laser element.
Stated Advantages
Improved spectral accuracy without requiring high-wavelength-stability lasers or thermostatic equipment.
Documented Applications
Fourier-transform spectroscopy using an optical device that includes a moving mirror, a sealed gas cell for absorption-based reference, and a laser-based length measurement optical system.
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