Abstract:
A method of classifying an electromagnetic-energy emitting source event as one of a first, second, and third class event includes registering an irradiance spectrum from the source event. The intensity of the energy emitted from the source event is measured within each of first, second and third energy sub-ranges and first, second and third relative-energy values are associated with, respectively, the first, second and third energy sub-ranges. A first class-eliminating determination is rendered by comparing to one another a first selected set of two of the relative-energy values, thereby yielding two remaining-candidate event classes. When necessary, a second class-eliminating determination renders the proper classification for the source event by comparing to one another a second selected set of relative-energy values including the relative-energy value not selected for inclusion in the first selected set of two relative-energy values and one of the previously selected relative-energy values. The energy-value comparisons are carried out with reference to modeled source-event irradiance data from which expected ratio behaviors among the selected energy sub-ranges are ascertainable relative particular event types at various ranges and under disparate atmospheric conditions.
Abstract:
The present disclosure provides for a method for analyzing treated fingerprints on a document. A sample document is provided. A digital image of the sample document is obtained. The sample document is treated with a reagent and a hyperspectral image of the document is obtained. The hyperspectral image of the document is analyzed to determine a region of interest and a hyperspectal image is obtained of the region of interest. The present disclosure also provides for a system comprising a carrier frame, an imaging station for obtaining a digital image of the sample document, a first processing station for treating the document and a second processing station for developing the treated document, a second imaging station for obtaining a hyperspectral image of at least one of the document and a region of interest of the document, and a robotic subsystem for transporting the document through the system.
Abstract:
The present subject matter relates to methods of high-speed analysis of product samples during production of the product. Light is directed to a portion of a product under analysis and reflected from or transmitted through the product toward optical detectors. Signals from the optical detectors are compared to determine characteristics of the product under analysis. Temperature within the monitoring system may be monitored in order to provide compensation for the signals produced by the optical detectors. The products under analysis may be stationary, moved by an inspection point by conveyor or other means, or may be contained within a container, the container including a window portion through which the product illuminating light may pass.
Abstract:
System and method for assessing the occurrence of an unknown substance in a sample that comprises multiple entities. A reference library is provided comprising a plurality of reference data sets representative of at least one known substance. A first feature of the entities is assessed wherein the first feature is characteristic of the unknown substance. A region of interest is selected wherein the region of interest comprises at least one entity exhibiting the first feature. A spatially accurate wavelength resolved Raman image is obtained wherein each pixel in the image is the Raman spectrum of the sample at the corresponding location. The spatially accurate wavelength resolved image is assessed to thereby identify the unknown substance.
Abstract:
A method for passive background correction during spatially or angularly resolved detection of emission that is based on the simultaneous acquisition of both the passive background spectrum and the spectrum of the target of interest.
Abstract:
System and method for blind echo cancellation in a received terahertz signal in a pulsed terahertz system for imaging or spectroscopy. Blind signal processing methods estimate the impulse response of the reflection mechanism and do not require a reference measurement to be taken. The reference signal may be recovered using a successive approach wherein the reference is first estimated using cross-correlation with the received signal and the received signal is represented as a function of the reference signal. For each successive echo, the calculated echo may be subtracted from the received signal and then the estimate of the reference signal is refined. Using an analytical approach, the parameters of a transfer function modeling the reflection mechanism may be estimated by optimizing a cost function.
Abstract:
A zoned order sorting filter for a spectrometer in a semiconductor metrology system is disclosed with reduced light dispersion at the zone joints. The order sorting filter comprises optically-transparent layers deposited underneath, or on top of thin-film filter stacks of the order sorting filter zones, wherein the thicknesses of the optically-transparent layers are adjusted such that the total optical lengths traversed by light at a zone joint are substantially equal in zones adjacent the zone joint. A method for wavelength to detector array pixel location calibration of spectrometers is also disclosed, capable of accurately representing the highly localized nonlinearities of the calibration curve in the vicinity of zone joints of an order sorting filter.
Abstract:
The invention relates to a method for the spectral analysis of metal samples with the following steps: a. Recording of a spectrum of an unknown sample with a number of preset excitation parameters, b. Comparison of the spectrum with stored spectra of a number of control samples, c. Determination of the control sample with the best concordance of spectra, d. Setting of the excitation parameters, which are stored for the best and closest control sample determined in step c, e. Recording of the spectrum of the unknown sample with the excitation parameters set in step d, f. Calculation of the intensity ratios of the analysis lines stored for the control sample and the internal standards of the spectrum recorded in step e.
Abstract:
Impinging electromagnetic radiation generates pairs of majority and minority carriers in a substrate. A spectrometer device for detection of electromagnetic radiation impinging on a substrate comprises means for generating, in the substrate, a majority carrier current; at least one detection region for collecting generated minority carriers, the minority carriers being directed under influence of the majority carrier current; and means for determining spectral information based on minority carriers collected at the at least one detection region.
Abstract:
The invention relates to systems and methods for measuring properties of samples with standardized spectroscopic systems. The methods can include (i) measuring, with a first spectroscopic system, spectra of at least three different reference targets; (ii) calibrating the first spectroscopic system; (iii) measuring, with the first spectroscopic system, a spectrum of a known reference specimen having a known value of the property; (iv) generating a model for the measured property using the spectrum of the known reference specimen; (v) measuring, with a second spectroscopic system, the spectra of at least three different reference targets; (vi) calibrating the second spectroscopic system; (vii) applying the model to the second spectroscopic system; (viii) measuring a spectrum of the sample using the second spectroscopic system; and (ix) determining a value of the property using the model.