Abstract:
A method of calibrating a hyperspectral imaging device includes illuminating a hyperspectral imaging sensor with a light source having known spectral properties, sampling the light from the light source with the hyperspectral imaging sensor to obtain sampled spectral properties, and calibrating a performance characteristic of the hyperspectral imaging sensor based upon comparing the sampled spectral properties of the light source to the known spectral properties.
Abstract:
A small scale and low cost spectral sensing system designed primarily for multi-component fluids that provides a compact, low cost platform for analyzers or chemical sensors with limited number of optical and mechanical components featuring a light source, an optical interface with the sample, and a custom detector (multi-element). A single detector element has a specific wavelength, defined by a filter that can be used to select and measure specific chemical compounds. Multiple detector elements are combined to create a multi-channel detector capable of measuring a broad range of wavelengths from ultraviolet (UV) to near and mid-infrared wavelengths. The fabricated sensor can be configured for almost any class of material including gases, vapors, and liquids, with extension to solids. This is linked to the use of the custom detectors featuring filters tailored to specific substances in a broad spectral range from the UV to infrared.
Abstract:
A method for spectral interpretation in absorption spectroscopy uses a nonlinear spectral fitting algorithm for interpretation of spectral features in complex absorption spectra. The algorithm combines two spectral modeling techniques for generating spectral models to be used in the curve fitting process: a line-shape model and a basis-set model. The selected models for all gas components are additively combined using a least squares minimization, allowing for quantification of multiple species simultaneously.
Abstract:
An example embodiment may include a hyperspectral analyzation subassembly configured to obtain information for a sample. The hyperspectral analyzation subassembly may include one or more transmitters configured to generate electromagnetic radiation electromagnetically coupled to the sample, one or more sensors configured to detect electromagnetic radiation electromagnetically coupled to the sample, and an electromagnetically transmissive window. At least one of the sensors may be configured to detect electromagnetic radiation from the sample via the window. The hyperspectral analyzation subassembly may include an analyzation actuation subassembly configured to actuate at least a portion of the hyperspectral analyzation subassembly in one or more directions of movement with respect to the sample.
Abstract:
Provided are devices and methods for grouping light emitters and devices including the same. Embodiments of such methods may include selecting a portion of the light emitters using a region of a multiple axis color space that is configured to represent each of a plurality of colors as at least two chromaticity coordinates. The region may be proximate a predefined point on the multiple axis color space and includes a major axis having a first length and a minor axis having a second length that is less than the first length.
Abstract:
A system and method of sorting mineral streams, for example laterite mineral ores, into appropriately classified valuable and waste streams for maximum recovery of value from the mineral stream, e.g., a stream of minerals includes receiving response data indicating reflected, absorbed or backscattered energy from a mineral sample exposed to a sensor, where the mineral sample is irradiated with electromagnetic energy. The system determines spectral characteristics of the mineral sample by performing spectral analysis on the response data of the mineral sample and identifies a composition of the mineral sample by comparing the spectral characteristics of the mineral sample to previously developed spectral characteristics of samples of known composition. The system then generates a sort decision for the mineral sample based on the comparison, where the sort decision is used in diverting the mineral sample to a desired destination e.g. pyrometallurgical treatment stages, or to a waste stream.
Abstract:
A method of processing spectral data is disclosed and may include the steps of illuminating a medium to detect an inside particular component with light; obtaining a first spectral data for the medium at a first radial position and a second spectral data for the medium at a second radial position, wherein the first radial position and the second radial position are selected arbitrarily; and performing differential processing on the first spectral data and the second spectral data.
Abstract:
For cavity enhanced optical spectroscopy, the cavity modes are used as a frequency reference. Data analysis methods are employed that assume the data points are at equally spaced frequencies. Parameters of interest such as line width, integrated absorption etc. can be determined from such data without knowledge of the frequencies of any of the data points. Methods for determining the FSR index of each ring-down event are also provided.
Abstract:
Apparatus for performing Raman spectroscopy may include a first laser source having a first emission wavelength and a second laser source having a second emission wavelength. A separation between the first and second emission wavelengths may correspond to a width of a Raman band of a substance of interest. A switch may provide switching between the first and second laser sources. An ensemble of laser emitters may be provided. A Bragg grating element may receive laser light from the ensemble. An optical system may direct light from the Bragg grating element into an optical fiber. A combined beam through the optical fiber may contain light from each of the emitters.
Abstract:
A spectroscopy system for auto-aligning a biopsy collecting device is presented. The spectroscopy system includes an illumination subsystem configured to emit an illumination light towards the biopsy collecting device, whereas the biopsy collecting device includes an activator unit and a needle unit and wherein the needle unit includes a cannula and a stylet having a biopsy specimen. Also, the spectroscopy system includes a fixation subsystem capable of holding the biopsy collecting device and configured to place the needle unit comprising the biopsy specimen across the illumination light. Further, the spectroscopy system includes a detection subsystem configured to receive a light comprising at least one of an attenuated illumination light and a re-emitted light from the needle unit. In addition, the detection subsystem is configured to send a control signal to align the needle unit at a predetermined position in the spectroscopy system based on the received light.