Abstract:
Provided is a spectrophotometer having a sample container 30, a light-source unit 10 for casting measurement light into the sample container 30, a photodetector 40 for detecting light obtained from the sample container 30 illuminated with the measurement light, a light separator 20 placed between the light-source unit 10 and the sample container 30, an A/D converter 50 for converting detection signals from the photodetector 40 into digital signals, and an A/D conversion time controller 65 for controlling an A/D conversion time in the A/D converter 50. The A/D converter 50 receives, for each A/D conversion time, detection signals sequentially produced by the photodetector 40, and sequentially outputs values corresponding to the amounts of signals received. The A/D conversion time controller 65 controls the A/D conversion time at five times (preferably, ten times) the cycle of commercial power supplies or longer during wavelength-correctness validation of the light separator 20.
Abstract:
An imaging transform spectrometer, and method of operation thereof, that is dynamically configurable “on demand” between an interferometric spectrometer function and a broadband spatial imaging function to allow a single instrument to capture both broadband spatial imagery and spectral data of a scene. In one example, the imaging transform spectrometer is configured such that the modulation used for interferometric imaging may be dynamically turned ON and OFF to select a desired mode of operation for the instrument.
Abstract:
A compressive sensing-based multispectral video imager comprises a beamsplitter, a first light channel, a second light channel, and an image reconstruction processor; the beamsplitter is configured to divide the beam of an underlying image into a first light beam and a second light beam; the first light beam enters the first light channel, processed and sampled in the first light channel, to obtain a first mixing spectral image which is transferred to the image reconstruction processor; the second light beam enters the second light channel, processed and sampled in the second light channel, to obtain a second mixing spectral image which is transferred to the image reconstruction processor; the image reconstruction processor is configured to reconstruct the underlying spectral image based on the first mixing spectral image and the second mixing spectral image by using non-linear optimization method.
Abstract:
The present disclosure provides for a system and method for detecting and identifying unknown targets. At least one region of interest comprising an unknown target in a sample scene may be targeted using SWIR spectroscopic techniques. A region of interest may be surveyed to thereby determine whether or not a human is present. This surveying may be achieved my assessing LWIR data, data acquired from motion sensors, and combinations thereof. If no human is present in a region of interest, the region may be interrogated using Raman spectroscopic techniques to thereby obtain a Raman data set representative of the region of interest. This Raman data set may be assessed to thereby identify said unknown target. This assessment may be achieved by comparing the Raman data set to a reference data sets in a reference database, where each reference data set is associated with a known target.
Abstract:
A spectroscopic imaging device adjusting method adjusts a relative arrangement relationship among a collimating lens, a diffraction grating, a condensing lens and an array type light receiving part so as to maximize the value of the following expression (1) for an output values ƒn from respective light receiving sensors Pn when monochromatic light is inputted to a spectroscopic imaging device, wherein α>1 and n is each integer equal to or larger than 1 and equal to or smaller than N. [ Expression 1 ] ∑ n = 1 N f n α ( 1 )
Abstract translation:分光成像装置调整方法调整准直透镜,衍射光栅,聚光透镜和阵列型光接收部之间的相对配置关系,以使来自各自的输出值ƒn的以下表达式(1)的值最大化 当单色光被输入到分光成像装置时,光接收传感器Pn,其中α> 1且n分别为等于或大于1且等于或小于N的整数。[表达式1]Σn = 1 N (f)
Abstract:
In an apparatus including an irradiation unit capable of irradiating a sheet selectively with visible light and ultraviolet light, and a measurement unit which measures a spectral reflectance based on light reflected by the sheet, whether to cause the irradiation unit to emit the ultraviolet light when measuring the spectral reflectance of a patch image printed on the sheet is determined based on the spectral reflectance of a reference image of the color of the sheet that has been measured by the measurement unit which measures a spectral reflectance while the ultraviolet light is emitted.
Abstract:
A spectral characteristic measurement method for measuring spectral characteristics of measured light with higher accuracy is provided. The spectral characteristic measurement method includes causing an optical measurement instrument having detection sensitivity in a first wavelength range to receive light in a second wavelength range which is a part of the first wavelength range, obtaining characteristic information indicating a stray light component from a portion of a first spectrum detected by the optical measurement instrument, that corresponds to a range other than the second wavelength range, and obtaining a pattern indicating a stray light component generated in the optical measurement instrument by subjecting the characteristic information to extrapolation processing as far as the second wavelength range in the first wavelength range.
Abstract:
An active imaging system, which includes a light source and light sensor, generates structured illumination. The light sensor captures transient light response data regarding reflections of light emitted by the light source. The transient light response data is wavelength-resolved. One or more processors process the transient light response data and data regarding the structured illumination to calculate a reflectance spectra map of an occluded surface. The processors also compute a 3D geometry of the occluded surface.
Abstract:
Embodiments of the present disclosure include an optical probe capable of communicating identification information to a patient monitor in addition to signals indicative of intensities of light after attenuation by body tissue. The identification information may indicate operating wavelengths of light sources, indicate a type of probe, such as, for example, that the probe is an adult probe, a pediatric probe, a neonatal probe, a disposable probe, a reusable probe, or the like. The information could also be utilized for security purposes, such as, for example, to ensure that the probe is configured properly for the oximeter, to indicate that the probe is from an authorized supplier, or the like.
Abstract:
A method and an apparatus for increasing the accuracy of a spectrometer system corrects for light source quality, exposure time, distortion in y direction, distortion in x direction, temperature dependence, pixel alignment variability, dark pixels, bad pixels, pixel read noise, and pixel dark current noise. The method and apparatus produces an algorithm for optimizing spectral data and for measuring a sample within the spectrometer system using the optimization algorithm. The spectrometer apparatus comprises a composite external light source, a source light collector, an illumination light structuring component, a sample, a sample light collector, a spectrometer light structuring component, a light dispersing engine, photo detectors, an electrical signal converter, a data preprocessing unit, and a data analyzer. The method and apparatus can include a corrected photo detector algorithm, sample illumination correction algorithm, LDE-PD alignment procedure, SLSC-LDE alignment procedure, distortion correction matrix, and an algorithm for optimizing of spectral data.