Abstract:
The disclosure generally relates to a method and apparatus for compact dispersive imaging spectrometer. More specifically, one embodiment of the disclosure relates to a portable system for obtaining a spatially accurate wavelength-resolved image of a sample having a first and a second spatial dimension. The portable system can include a photon emission source (1105, 1110) for sequentially illuminating a plurality of portions of said sample with a plurality of photons to produce photons scattered by the sample. The photon emission source (1105, 1110) can illuminate the sample along the first spatial dimension for each of plural predetermined positions of the second spatial dimension. The system may also include an optical lens (1116) for collecting the scattered photons to produce therefrom filtered photons, a dispersive spectrometer (1124, 1130) for determining a wavelength of ones of the filtered photons, a photon detector (1126, 1130) for receiving the filtered photons and obtaining therefrom plural spectra of said sample, and a processor (1136) for producing a two dimensional image of said sample from the plural spectra.
Abstract:
A method including: (i) modulating (105) multiple components (e.g., different spatial regions, different wavelengths, or both) of electromagnetic radiation emerging from an object with different time-varying functions; (ii) measuring at least one time-varying signal derived from the modulated electromagnetic radiation emerging from the object; and (iii) reconstructing information about the object based on the measured signal and the time-varying functions.
Abstract:
A spectrophotometric system includes a zoom lens assembly that is mounted for axial translation relative to an integrating sphere. The zoom lens assembly includes first and second focusing lens mounted to an axially movable lens carrier. The lens carrier is positioned intermediate first and second sets of mirrors for reflecting/directing SCE and SCI beams toward fiber ports. A reference beam is also emitted from the integrating sphere and transmitted to a processor, thereby resulting in simultaneous tri-beam measurements. The disclosed spectrophotometric systems may also include an aperture plate detection assembly and/or a sample holder assembly that incorporates a dampening gas spring. The aperture plate detection system includes a detection disk that may include a plurality of pre-positioned sensors that interact with an activating ridge formed on the aperture plate for identification thereof.
Abstract:
Spectrometric apparatus (10) that include an array of detector elements (28) and exhibits a number of capabilities is disclosed. The elements (28) can be responsive to incident radiation to produce an output signal that includes information from the incident radiation. A spectrally selective element (26) can be located in an optical path between the radiation source (14) and the array (28), with an analysis module (18) responsive to the output signal operative to analyze spatial distribution of spectral information received by the array (28). The apparatus can also correct for differences in intensity and spectral variability for spectral image signals and/or compare the spectral image signals with a pattern in spatial-spectral coordinate space. Detector elements (28) can be responsive to scattering, and spatial information in their output can be analyzed.
Abstract:
Illuminators and systems are provided that permit the production of a beam of electromagnetic radiation having a selected peak wavelength band width, intensity, pulse frequency and pulse duration for a variety of analytical and therapeutic applications. The multiple beam illuminators (100) use filter elements arranged into filter arrays (309-311), having characteristic wavelength absorption. By providing a series of filter arrays (220) formed into a tracks having defined wavelength offsets, radiation passing through a portion of a track can be modified to include selected wavelength and bandwidth. Selection of a peak wavelength(s) and bandwidth can be accomplished using mechanical interrupter (152), mechanical shutter (1708), or electro-optical device (2000) including liquid crystal device. Multiple output beams (132,136) permit the coordinated illumination of a target, and sensors (601a-601c) provide feedback regarding the effects of illumination of the target. Computer storage devices (606), programs (604), and controllers (603) can provide easy selection of the characteristics of the output beams. Output beams (605) can have a variety of different shapes and configurations, depending on the desired application.
Abstract:
A multiwavelength selector for use with a high speed performance monitor, that uses a spatial wavelength separator, a configurable spatial filter, a focusing assembly, and a photodetector to select a wavelength or wavelengths from a plurality of incoming wavelengths, for further processing by said high speed performance monitor. The invention is intended for use in fiber optic network application.
Abstract:
Plural electronic or optical images are provided in a streak optical system, as for instance by use of plural slits instead of the conventional single slit, to obtain a third, fourth, etc. dimension - rather than only the conventional two, namely range or time and azimuth. Such additional dimension or dimensions are thereby incorporated into the optical information that is to be streaked and thereby time resolved. The added dimensions may take any of an extremely broad range of forms, including wavelength, polarization state, or one or more spatial dimensions - or indeed virtually any optical parameter that can be impressed upon a probe beam. Resulting capabilities remarkably include several new forms of lidar spectroscopy, fluorescence analysis, polarimetry, spectropolarimetry, and combinations of these, as well as a gigahertz wavefront sensor.
Abstract:
Encoded spatio-spectral information processing is performed using a system having a radiation source (12), wavelength dispersion device (16) and two-dimensional switching array (18), such as digital micro-mirror array (DMA). In one aspect, spectral components from a sample (24) are dispersed in space and modulated separately by the switching array, each element of which may operate according to a predetermined encoding pattern. The encoded spectral components can then be detected and analyzed. In a different aspect, the switching array (18) can be used to provide a controllable radiation source for illuminating a sample (24) with radiation patterns that have predetermined characteristics and separately encoded components. Various applications are disclosed.
Abstract:
An optical system for analyzing light from a plurality of samples is provided. The optical system includes a plurality of holders adapted to have samples located therein, a collection lens, a transmission grating, and a reimaging lens. The collection lens is configured to receive and substantially collimate light from the samples. The transmission grating is configured to spectrally disperse the substantially collimated light from the collection lens. The reimaging lens is configured to receive the light from the light dispersing element and direct the light onto a light detection device. A method of optically analyzing at least one sample is also provided.
Abstract:
Low cost and form factor spectrometers are disclosed. A spectrometer comprises a substrate, a plurality of optical sensors (979), a plurality of spectral filters (977), an optical manifold (976) and one or more processing elements (980). The plurality of spectral filters (977) and the one or more processing elements (980) are mounted on the substrate. The spectral filters (977) are fixedly positioned over at least a group of the optical sensors (979) and fixedly positioned with respect to the substrate. An optical manifold (976) is fixedly positioned over the spectral filters (977). The optical manifold (976) has a plurality of exit ports and an entrance port, wherein light entering the entrance port is transmitted to an interior portion of the optical manifold (976) and a portion of the light is transmitted from the exit ports through some of the spectral filters (977). The spectrometers are disclosed embedded in printing and scanning devices, computer companion devices, scope-type devices and the like.