Abstract:
A system and method for standoff detection of explosives and explosive residue. A laser light source illuminates a target area having an unknown sample producing luminescence emitted photons, scattered photons and plasma emitted photons. A first optical system directs light to the target area. A video capture device outputs a dynamic image of the target area. A second optical system collects photons, and directs collected photons to a first two-dimensional array of detection elements and/or to a fiber array spectral translator device which device includes a two-dimensional array of optical fibers drawn into a one-dimensional fiber stack. A spectrograph is coupled to the one-dimensional fiber stack of the fiber array spectral translator device, wherein the entrance slit of the spectrograph is coupled to the one dimensional fiber stack.
Abstract:
A compact handy type inspection instrument is provided for conducting readily nondestructive inspection of an inspection object in any working site. The inspection instrument comprises:
a spectroscope assembly containing an optical fiber-arranging member for arranging and holding a light-outputting end of an optical fiber bundle to be flat in a uniform layer thickness, a packaged compact spectroscope which is enclosed in a package having a slit-shaped light inlet window on a side confronting the rectilinear light-outputting end of the optical fiber-arranging member and is constituted of a linear type continuous variable interference filter, a microlens array, and a linear type silicon array sensor assembled in the named order from the side of the light inlet window toward the opposite side, and a positioning means for positioning the rectilinear light-outputting end of the optical fiber bundle to fit to the light input window; and a detection head; incorporated together into a main body casing.
Abstract:
A scanning monochromator (FIG. 12) comprises means for providing an input light beam (INPUT LIGHT BEAM); a first stage monochromator (252) including a first diffraction grating for diffracting the input light beam (INPUT LIGHT BEAM) and means for rotating the first diffraction grating, the first stage monochromator (252) providing a first stage output light beam; a second stage monochromator (254) including a second diffraction grating for diffracting the first stage output light beam and means for rotating the second diffraction grating, the second diffraction grating diffracting the first stage output light beam such that said first stage output light beam is recombined by the second diffraction grating to provide a second stage output light beam (OUTPUT LIGHT BEAM); and an output aperture (256) for passing a selected portion of the second stage output light beam (OUTPUT LIGHT BEAM) to provide increased selectivity, whereby a high close-in dynamic range is achieved.
Abstract:
A reflectometer (10) for measuring absorption of light in selected regions of the light spectrum by a diffuse reflector. The reflectometer (10) is adapted to precisely measure absorption resulting from the constituents present in body fluids. The sample (30) to be measured is illuminated by a focused light source (120) at an angle of 45° to its surface. The light diffusely reflected about the normal to the sample (30) falls on a small round bundle (200), the fibers are arranged into a narrow rectangle. This rectangle forms the entrance slit (230) for a concave holographic diffraction grating (230) spectrally separated over a flat field suitable for recording the spectrum on film or on an array of discrete detectors.
Abstract:
In a real-time color comparator which performs color comparisons of sample objects to a reference color for the purpose of identification, sorting or matching two optical paths (15, 16) are positioned to collect the light from a reference object (12) and a sample object (11). The light outputs from the two paths are directed onto a spectral dispersive element in the form of a concave diffraction grating (20) that decomposes each light signal into its spectral constituents which are imaged on a dual photodetector array (30). The color signature from the reference and the color signature from the sample are compared.
Abstract:
In an optical instrument, fiber optics are employed to receive light from a linear filament. The fiber optics are arranged into a plurality of light receiving bundle ends distributed around the linear filament and shaped into narrow rectangular slits aligned with the filament. The fibers from each of the receiving ends are equally distributed between two transmitting ends which direct the light through cylindrical lenses to opposite sides of a rotating filter wheel in a paddle wheel configuration. Light beams from the transmitting ends of the fiber optic bundles pass through filters on the filter wheel to additional fiber optic bundles which carry the received light to a probe.
Abstract:
L'invention concerne un appareil de spectrocolorimétrie, comprenant une carte opto-électronique (12) sur laquelle sont regroupés les éléments essentiels de l'appareil, et notamment un spectromètre (14) avec une fente d'entrée (16) et une barrette (18) de photodétecteurs (20), deux voies d'étalonnage (26) et deux voies de mesure (28) à fibres optiques, les extrémités des fibres optiques étant superposées dans la fente d'entrée (16) du spectromètre. L'appareil est particulièrement destiné à être utilisé dans un environnement industriel.
Abstract:
The invention provides a system having a broadband spectrometer 20 with a fiber optic reformattor 16 for field use in detecting and identifying gas clouds within a field of view. The system includes a grating type spectrometer 20, a fiber optic reformattor 16, a focal plane detector array 24 and electronics 42-52 for background signal substraction techniques for generating spectral signature data which is analyzed for gas detection and outputting a decision making signal for recognition.
Abstract:
A liquid sample analyzer includes a liquid sample source, a flow cell, an optical device and a plurality of optical fibers. The flow cell is configured to receive a flow of a liquid sample from the liquid sample source. The plurality of optical fibers optically connect the flow cell to the optical device to transmit light between the flow cell and the optical device.
Abstract:
A novel device, method and systems disclosed managing the thermal challenges of LIBS laser components and a spectrometer in a handheld structure as well the use of simplified light signal collection which includes a bare fiber optic to collect the emitted light in close proximity to (or in contact with) the test material. In one example embodiment of the handheld LIBS device, a burst pulse frequency is 4 kHz is used resulting in a time between pulses of about 250µs which is a factor of 10 above that of other devices in the prior art. In a related embodiment, an active Q-switched laser module is used along with a compact spectrometer module using a transmission grating to improve LIBS measurement while substantially reducing the size of the handheld analyzer.