Abstract:
A method of non-destructively determining the amount of ultraviolet degradation of a surface and/or paint adhesion characteristics of the surface corresponding with UV damage including determining a physical property of a composite material/surfacing film by providing a series of composite materials/surfacing films which are subjected to increasing UV light exposure to create a set of UV damage 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 UV damage for samples in question.
Abstract:
A method of calibrating an optical analysis system uses multivariate optical signal analysis. The method includes determining a parameter of a reference sample, and comparing the actually determined parameter with a reference parameter that represents a precise and real property of the reference sample. Based on the comparison, a calibration value is determined that is applicable to perform a calibration of the optical analysis system with respect to at least one compound or analyte of the reference sample. Parameters and reference parameters of a reference sample may refer to a concentration of an analyte dissolved in the sample, or to spectroscopic background signals that have to be taken into account when performing a spectral analysis based on optical signals obtained from the reference sample. Analyte-specific reference data is stored in a calibration unit of the optical analysis system and allows a high degree of automation of the calibration process.
Abstract:
The present subject matter relates to multivariate optical analysis systems employ multivariate optical elements and utilize multivariate optical computing methods to determine information about a product carried by light reflected from or transmitted through the product. An exemplary method of processing and monitoring the product includes introducing the product at an inspection point; illuminating the product with a spectral-specific light though an optic lens; directing the light that has passed through at least a section of the product through at least one multivariate optical element to produce a first signal, the directed light carrying information about the product; detecting the signal at a detector; and determining at least one property of the product based upon the detector output.
Abstract:
A box 14 having a body 13 is used with a transparent flexible bag containing a liquid such as an IV bag. First and second faces 12 are positioned relative to each other. The faces each have therewithin an end or fiber optic port 11 of a respective light path. A light source is optically coupled with the light path of the first face and a spectrometer is optically coupled with the light path of the second face. The light paths are coaxial and are disposed so that the transparent flexible bag is positionable therebetween. The spectrometer is disposed to detect an anomaly in the liquid within the transparent flexible bag, and to annunciate the anomaly to a human user. The box defines a reproducible light path length through the liquid. A caliper 29 having a body 22 may be used in spectrometric analysis of a transparent tube containing a liquid such as a syringe or an IV line. The caliper has finger pads 27 which permit opening the spring-loaded caliper as needed. Rivets 25 provide a pivoting action relative to a pivot structure 21 which can also serve as a distance gauge. Compression spring 24 urges the caliper jaws together at lens locations 26. Lens locations 26 are optically coupled with internal fiber optic lines 28, and thence to external fiber optic connectors 23. A light source is optically coupled with one of the connectors 23 and a spectrometer is optically coupled with the other of the connectors 23.
Abstract:
A visible/near-infrared spectrum analyzing method for identifying components of a sample and determining characteristics of the components using visible light and/or near-infrared light having a wavelength of 400 to 2500 nm. The quantitative determination of the components, which have been conventionally hard to identify, of a grape of a small fruit cultivar for wine making can be made in a nondestructive way. A grape of a small fruit cultivar for wine making (a sample under examination) is irradiated with visible light and/or near-infrared light having a wavelength of 600 to 1100 nm and is subjected to spectrum determination of the sample and an absorption spectrum is determined from the obtained spectrum. By employing a multivariate statistical analysis (hereinafter referred to multivariate analysis) by the PLS or MLR method, a model enabling quantitative determination of the components of the sample under examination is created.
Abstract:
A spectroscopic method and spectroscopy system therefrom for analyzing samples. A sample includes a first chemical component that has a characteristic first absorption peak is provided. The sample is irradiated in a measurement waveband proximate to the first absorption peak, and at a first and a second reference waveband where the first chemical component lacks characteristic absorption features. Reflected or transmitted detection data is obtained including a measured power proximate to the first absorption peak and first and second reference powers at the reference wavebands. A plurality of different waveband ratios are evaluated using pairs of detection data to generate a plurality of measured waveband ratio values. A parameter of the first chemical component is then determined by evaluating a multidimensional polynomial calibration equation that relates the parameter of the first chemical component to the plurality of different waveband ratios by substituting the measured waveband ratio values into the calibration relation.
Abstract:
The nutritional quality of milk lipids is determined by a method for predicting percentages of minor fatty acids in milk. A database is created by correlating known fatty acid profiles of reference milk samples obtained by gas phase chromatography to mid-infrared spectra to obtain calibrations, wherein the calibrations vary in accuracy from one fatty acid to another. The determination of a milk fatty acid profile to be analyzed through infrared treatment is limited to some fatty acids with a satisfactory calibration. Equations to predict the percentages of minor fatty acids are developed using correlations of fatty acids with satisfactory calibrations.
Abstract:
A method for monitoring of siloxane compounds in a biogas includes the step of generating a first absorption spectrum based on a ratio of a first spectral measurement and a second spectral measurement. The first spectral measurement is from a non-absorptive gas having substantially no infrared absorptions in a specified wavelength range of interest and the second spectral measurement is from a sample gas comprising the biogas. The method also includes the step of calculating a concentration of at least one siloxane compound in the biogas using a second absorption spectrum based on, at least, a first individual absorption spectrum for a known concentration of the at least one siloxane compound.
Abstract:
Some principles described herein contemplate implementation of downhole imaging for the characterization of formation fluid samples in situ, as well as during flow through production tubing, including subsea flow lines, for short term investigation, permanent, and/or long term installations. Various methods and apparatus described herein may facilitate downhole testing. For example, some embodiments facilitate multi-dimensional fluorescence spectrum measurement testing downhole.
Abstract:
A method for determining the nutritional quality of milk lipids, involving the steps consisting in considering a defined number of reference milk samples; determining, for each of said reference samples, a fatty acid profile and an infrared spectrum obtained through reflection on the reference sample of a radiation in the mean infrared and associating respectively the fatty acid profiles to the infrared spectra, subjecting the milk to be analyzed, the lipid nutritional quality is to be determined, to an infrared radiation, so as, through reflection, to infer an infrared spectrum, and comparing the milk infrared spectrum to be analyzed to the infrared spectra of the reference samples, so as to infer a fatty acid profile of the milk to be analyzed.