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US 8,552,382 B2Granted
Thermal effect measurement with mid-infrared spectroscopy
AssigneeThe Boeing Company
InventorsPaul H. Shelley, Gregory J. Werner, Paul G. Vahey
Life of this patent
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Abstract
A method of determining a physical property of a composite material includes providing a series of composite materials/surfacing films, which are subjected to increasing thermal experience to create a set of thermal effect standards, collecting mid-IR spectra on those standards, performing data pre-processing and then multivariate calibration on the spectra of the composite materials/surfacing films, and using that calibration to predict the thermal effect for samples in question.
Claims20
An infrared spectroscopy multivariate calibration and prediction method, comprising:
- providing resin-fiber polymer composite material standards with physical properties information as a function of thermal exposure in a range of interest;
- collecting infrared data comprising mid-infrared spectra on said composite material standards;
- performing multivariate calibration on said infrared data including all wavelengths comprising said mid-infrared spectra;
- defining a calibration model by calibrating said multivariate calibration on said infrared data to said physical properties information;
- and
- predicting physical properties comprising a physical property value of a resin-fiber polymer composite material in question using said calibration model.
3 more elements
A method of determining a physical property of a composite material by infrared spectroscopy, comprising:
- providing resin-fiber polymer composite material standards with physical properties as a function of thermal exposure information in a range of interest;
- collecting infrared data comprising mid-infrared spectra on said composite material standards;
- performing pre-processing on said infrared data;
- performing multivariate calibration on said infrared data including all wavelengths comprising said mid-infrared spectra;
- defining a calibration model by calibrating said multivariate calibration on said infrared data to said physical properties information;
- and
- predicting physical properties comprising a physical property value of a resin-fiber polymer composite material in question using said calibration model.
4 more elements
A method of determining a physical property of a composite material by infrared spectroscopy, comprising:
- providing resin-fiber polymer composite material thermal effect standards with physical properties as a function of thermal exposure information in a range of interest;
- collecting mid-infrared spectra on said composite material thermal effect standards;
- performing pre-processing on said infrared spectra using various pre-processing methods;
- performing multivariate calibration on said infrared spectra including all wavelengths comprising said mid-infrared spectra;
- defining calibration models by calibrating said multivariate calibration on said mid-infrared spectra to said physical properties information;
- saving said calibration models in an appropriate format for each of said pre-processing methods;
- converting said calibration models to spectrometer method files;
- providing a spectrometer;
- loading said spectrometer method files into said spectrometer;
- and predicting physical properties comprising a physical property value of a resin-fiber polymer composite material in question for each of said pre-processing methods using said calibration models in said spectrometer method files.
7 more elements
An infrared spectroscopy multivariate calibration and prediction method, comprising:
- providing resin-fiber polymer composite material standards with mechanical properties information as a function of thermal exposure in a range of interest;
- collecting at least four mid-infrared spectra on each of said composite material standards;
- performing pre-processing on said infrared spectra;
- performing multivariate calibration on said infrared spectra including all wavelengths comprising said spectra;
- defining a calibration model by calibrating said multivariate calibration on said infrared spectra to said mechanical properties information;
- saving said calibration model in an appropriate format;
- converting said calibration model to a method file for a hand-held spectrometer;
- loading said calibration model into said hand-held spectrometer;
- and
- predicting a mechanical property value of a resin-fiber polymer composite material in question using said hand-held spectrometer.
7 more elements
A method of determining a physical property of a composite material by infrared spectroscopy, comprising:
- providing resin-fiber polymer composite material thermal effect standards with thermal mechanical properties information as a function of thermal exposure in a range of interest;
- providing a hand-held spectrometer;
- collecting multiple mid-infrared spectra on each of said composite material thermal effect standards using said hand-held spectrometer;
- performing pre-processing on said infrared spectra using various pre-processing methods;
- performing multivariate calibration on said infrared spectra including all wavelengths comprising said spectra;
- defining calibration models by calibrating said multivariate calibration on said infrared spectra to said mechanical properties information;
- saving said calibration models in an appropriate format for each of said pre-processing methods;
- converting said calibration models to spectrometer method files for said hand-held spectrometer;
- loading said spectrometer method files into said hand-held spectrometer;
- predicting a mechanical property value of a resin-fiber polymer composite material in question for each of said pre-processing methods using said calibration models in said spectrometer method files;
- calculating the mean root square error of prediction for each of said pre-processing methods;
- and
- selecting a pre-processing method having the lowest prediction error for future use.
10 more elements
Dependencies are inferred from the claim text.