Reconstruction of frequency registration deviations for quantitative spectroscopy

A technology of registration deviation and frequency calibration, which is applied in the field of spectral analysis, can solve problems such as the reduction of the calibration status of the spectral analysis system

Active Publication Date: 2018-04-17
ENDRESS + HAUSER OPTICAL ANALYSIS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As in DAS, changes in the spectral scanning behavior of the light source can lead to distortions in the WMS line shape and variations in the peak and/or peak-to-trough heig

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  • Reconstruction of frequency registration deviations for quantitative spectroscopy
  • Reconstruction of frequency registration deviations for quantitative spectroscopy
  • Reconstruction of frequency registration deviations for quantitative spectroscopy

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Embodiment Construction

[0052] Sweeping wavelength / frequency spectroscopy is used in many industrial applications where the wavelength / frequency of light propagating through a measurement volume of a sample fluid is periodically varied over time by an amount (e.g., in frequencies such as MHz, GHz, fm, pm, nm, cm -1 etc.) to cover at least a portion of an absorption peak for the target analyte and / or background species (eg, other compounds present in the sample fluid, which may include overlapping spectral features that would interfere with the analysis of the analyte concentration). Changes in wavelength / frequency of light can be achieved by tuning wavelength / frequency filters via broadband light sources, and / or by manipulating monochromatic light sources to determine operating current, temperature, dispersive elements, vernier effects, acousto-optic modulators, At least one of an electro-optic modulator, an interference component, a grating structure, and the like.

[0053] Shifts in the frequency ...

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Abstract

Frequency registration deviations occurring during a scan of a frequency or wavelength range by a spectroscopic analysis system can be corrected using passive and/or active approaches. A passive approach can include determining and applying mathematical conversions to a recorded field spectrum. An active approach can include modifying one or more operating parameters of the spectroscopic analysissystem to reduce frequency registration deviation.

Description

[0001] Cross References to Related Applications [0002] This application is related to and claims priority from U.S. Provisional Application No. 62 / 200,581, filed August 3, 2015, and U.S. Patent Application No. 14 / 817,119, filed August 3, 2016, the contents of which are hereby incorporated by reference in their entirety into this article. technical field [0003] The present disclosure relates generally to spectroscopic analysis, and in particular to methods for achieving and maintaining accurate and reproducible frequency and / or wavelength registration of spectroscopic data from spectroscopic analyzers. Background technique [0004] One or more of degradation, drift, or non-reproducibility of hardware of the spectroscopic analysis system can affect frequency and wavelength registration observed in spectral scans obtained using the spectroscopic analysis system relative to when the spectroscopic analysis system is in calibration. Consequently, the accuracy and reproducibil...

Claims

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Application Information

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IPC IPC(8): G01J3/10G01J3/28G01N21/3504G01J3/42G01J3/433G01N21/27G01J3/02
CPCG01J3/0286G01J3/10G01J3/28G01J3/42G01J3/433G01J2003/4332G01J2003/4334G01N21/274G01N21/3504
Inventor 阿尔弗雷德·菲提施刘翔凯文·卢德卢姆马蒂亚斯·施里姆佩尔
Owner ENDRESS + HAUSER OPTICAL ANALYSIS INC
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