RECONSTRUCTION OF FREQUENCY REGISTRATION FOR QUANTITATIVE SPECTROSCOPY

摘要

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 analysis system to reduce frequency registration deviation.

主权项

1. A method comprising:
characterizing a frequency registration deviation of a spectroscopic analysis system, the characterizing comprising recording a field calibration spectrum indicative of one or more changes of a light source of the spectroscopic analysis system relative to a calibrated state of the spectroscopic analysis system; deriving a conversion function comprising at least one mathematical operation for reducing the frequency registration deviation relative to the calibrated state of the spectroscopic analysis system; converting a field spectrum recorded with the spectroscopic analysis system for a field sample comprising a sample fluid, the converting comprising applying the conversion function to the field spectrum to produce converted field spectral data comprising spectral data registered to corrected frequency response of the spectroscopic analysis system; and calculating one or more of a pressure of the field sample, a temperature of the field sample, and a concentration for one or more analytes in the field sample using the converted field spectral data.