Abstract:
An apparatus for measuring a wavelength-dependent optical characteristic of an optical system has a light-pattern generation device which generates a pattern of polychromatic light in an object plane. Together with the optical system, a measuring optical unit images the object plane on a spatially resolving light sensor. A dispersive optical element is arranged in a light path between the optical system and the light sensor in such a way that a plurality of images of the pattern with different wavelengths are generated simultaneously on the light sensor. The evaluation device determines the wavelength-dependent characteristic of the optical system from the plurality of images on the light sensor.
Abstract:
A spatial Fourier transform spectrometer is disclosed. The Fourier transform spectrometer includes a Fabry-Perot interferometer with first and second optical surfaces. The gap between the first and second optical surfaces spatially varies in a direction that is orthogonal to the optical axis of the Fourier transform spectrometer. The Fabry-Perot interferometer creates an interference pattern from input light. An image of the interference pattern is captured by a detector, which is communicatively coupled to a processor. The processor is configured to process the interference pattern image to determine information about the spectral content of the input light.
Abstract:
A system and method for using near-infrared or short-wave infrared (SWIR) sources such as lamps, thermal sources, LED's, laser diodes, super-luminescent laser diodes, and super-continuum light sources for early detection of dental caries measure transmission and/or reflectance. In the SWIR wavelength range, solid, intact teeth may have a low reflectance or high transmission with very few spectral features while a carious region exhibits more scattering, so the reflectance increases in amplitude. The spectral dependence of the transmitted or reflected light from the tooth may be used to detect and quantify the degree of caries. Instruments for applying SWIR light to one or more teeth may include a C-clamp design, a mouth guard design, or hand-held devices that may augment other dental tools. The measurement device may communicate with a smart phone or tablet, which may transmit a related signal to the cloud, where additional value-added services are performed.
Abstract:
Spectral imaging sensors and methods are disclosed. A spectral imaging sensor includes a color-coded array of apertures positioned to receive light from an object to be imaged. The array includes a first plurality of apertures configured to pass light in a first predetermined wavelength range and a second plurality of apertures configured to pass light in a second predetermined wavelength range different from the first predetermined wavelength range. The imaging sensor further includes one or more optical elements positioned to receive light passing through the color-coded array, and a photodetector positioned to receive light from the one of more optical elements. A spectral imaging method includes the steps of filtering light from an object to be imaged through a color-coded array of apertures, redirecting the filtered light with one or more optical elements, and receiving the redirected light with a photodetector.
Abstract:
A specimen measuring device includes: a light source device that irradiates a specimen surface of a specimen with illumination light from multiple illumination units at a plurality of illumination angles; a spectral camera device that is arranged above the specimen surface, spectrally separates reflected light from the specimen surface, and acquires 2D spectral information through a single image capturing operation; and a calculating unit that calculates deflection angle spectral information of the specimen surface used to measure a measurement value of a certain evaluation item of the specimen using a change in an optical geometrical condition of an illumination direction and an image capturing direction between pixels in an X axis direction and a Y axis direction of the spectral information.
Abstract:
The present invention provides a one-dimensional global rainbow measurement device and a measurement method. The measurement device comprises three parts, i.e., a laser emission unit, a signal collection unit and a signal processing unit. The laser emission unit is modulated to be a light sheet by a laser beam emitted by a laser, and configured to irradiate droplets in a spray field to generate rainbow signals. The signal collection unit is configured to separately image, by an optical system unit, the rainbow signals at measurement points of different height onto different row pixels of a CCD signal collector. The signal processing unit is configured to convert the received rainbow signals and process by a computer the rainbow signals in a form of data to obtain the measured values. The present invention can analyze gas-liquid phase flow fields during the injection, realize the online measurement of fuel atomization, spray and other processes, and can measure the refractive index, size, temperature and other parameters of the spray droplets in a real-time and non-contact manner.
Abstract:
A prism including a substrate faceted to provide a plurality of flat surfaces, wherein at least two of the plurality of surfaces, each including a filter coating, form at least two filter surfaces, wherein each filter surface selectively permits passage of a predetermined wavelength and reflects remaining wavelengths along an optical path towards another of the plurality of surfaces, optionally another filter surface, wherein an angle of incidence of each of the plurality of surfaces along the optical path is equal or nearly equal. An apparatus incorporating the prism and its use for splitting a light spectrum into a plurality of wavelengths or wavelength ranges.
Abstract:
An apparatus for detecting gas concentrations includes a coded filter to oscillate proximate a resonant frequency. A photo detector is positioned below the coded filter such that the coded filter selectively blocks light that is directed at the photo detector. Optics are positioned to project spectral information on to the coded filter. A processor analyzes a signal received from the photo detector. The processor is adapted to weight a harmonic attic signal.
Abstract:
This invention provides a novel methods and devices for measurement of particle concentration or changes in particle concentration over a wide linear range. The invention comprises one or more radiation sources and one or more detectors contained in a housing which is interfaced to a medium containing particulate matter. The one or more radiation sources are directed into the medium, scattered or transmitted by the particulate matter, and then some portion of the radiation is detected by the one or more detectors. Methods for confining the measurement to a specific volume within the medium are described. Algorithms are provided for combining the signals generated by multiple source-detector pairs in a manner that results in a wide linear range of response to changes in particle concentration. In one embodiment the sensor provides non-invasive measurements of biomass in a bioreactor. In another embodiment an immersible probe design is described, which may be suited for one-time use. In an addition embodiment, a sensor is provided which is well suited to the rapid sequential measurement of particle concentration in multiple vessels, such as assessment of biomass in series of shake flasks.
Abstract:
A plurality of configurations is simultaneously formed in a material by a single laser beam having a desired distribution pattern of wavelengths. An input laser beam has an initial wavelength distribution pattern. The initial wavelength distribution pattern is adjusted or modified into a desired final wavelength distribution pattern. For example, the initial wavelength distribution pattern is a wide range of wavelengths in a single bell-curve distribution while the desired final wavelength distribution pattern has a specific number of sharp peaks each over a predetermined narrow range. The laser beam having the desired final wavelength distribution pattern is focused upon on a material. Because of the multiple peaks in the wavelength distribution, the laser beam is focused at a plurality of the focal distances. A number of structures is simultaneously formed in a material at the multiple focal points or at multiple locations/depths when the above laser beam is projected onto the material.