178 results about "Spectral separation" patented technology

An apparatus and source arrangement for filtering an electromagnetic radiation can be provided which may include at least one spectral separating arrangement configured to physically separate one or more components of the electromagnetic radiation based on a frequency of the electromagnetic radiation. The apparatus and source arrangement may also have at least one continuously rotating optical arrangement which is configured to receive at least one signal that is associated with the one or more components. Further, the apparatus and source arrangement can include at least one beam selecting arrangement configured to receive the signal.

An integrated optical system and method employs an optical concentrator, a spectral splitting assembly for splitting incident light into multiple beams of light, each with a different nominal spectral bandwidth; and an array of optical detector sites wherein each of the detector sites has a nominal spectral response and wherein the detector sites are spatially arranged to provide an arrangement of said detector sites which are spatially variant relative to said nominal spectral responses. Such a system can be used for purposes such as optical detection and solar collection to provide improved efficiency. Improved efficiency of collection and manufacture are obtainable with using such devices.

Spectral separation filters for channels of a 3D image projection incorporate passbands of primary colors. In at least one of the filters, passbands are present in more than 3 primary colors. A set of two filters include a first filter having passbands of low blue, high blue, low green, high green, and red, and a second filter having passbands of blue, green, and red. The additional primary passbands of the first filter allow for an increased color space in projections through the filters compared to filters only having red, green, and blue primaries. The added flexibility of the increased color space is utilized to more closely match a color space and white point of a projector in which the filters are used.

A spectrometer apparatus for determining an optical characteristic of an object or material is disclosed. A probe is positionable to be in proximity to the object or material. First and second receivers are provided on the probe. Light from one or more first receivers is coupled to one or more first optical sensors via a spectral separation implement. Light from one or more second receivers is coupled to one or more second sensors without spectral separation of the light. A light source provides light to the object or material via the probe. A processor coupled to receive one or more signals from the first and second sensors determines the optical characteristic of the object or material and determines a physical position property of the probe with respect to the object or material or a non-color optical property of the object or material. The physical position property may be a distance or angular position of the probe with respect to a surface of the object or material. The non-color optical property may be translucence, gloss, gray level and / or surface texture.

A lidar system capable of remotely identifying calibrated absolute aerosol backscatter coefficients of atmospheric aerosol particles by transmitting a beam of light and spectrally separating the intensity of Rayleigh and Mie backscattering is disclosed. The transmitter features high pulse energy to generate sufficient Rayleigh backscattering, enabling atmospheric scanning in a timely manner. The transmitter employs a seeded Nd:YAG laser and a seeded stimulated Raman scattering wavelength shifter to achieve narrow bandwidth, eye-safe laser pulses. The receiver employs a telescope, collimating lens, beam splitter, molecular absorption filter, focusing lenses, and avalanche photodiodes. Mie backscattering is blocked by the molecular absorption filter to provide a Rayleigh signal, which is used with knowledge of atmospheric density to calibrate the Mie signal. The system is intended for atmospheric research and aerosol monitoring applications where calibrated Mie scattering intensity is necessary to measure the optical depths of aerosol structures such as plumes, clouds, and layers.

An apparatus for obtaining energy from a polychromatic radiant energy source has a light concentrator for concentrating and redirecting incident radiant energy, having an optical axis, and a spectral separator disposed along the optical axis, apart from the light concentrator and in the path of concentrated, redirected radiant energy. The spectral separator has a first planar surface treated to reflect a first spectral band of light toward a first focal region and to transmit a second spectral band and a second planar surface spaced apart from the first planar surface and oblique with respect to the first planar surface. The second planar surface is treated to reflect the second spectral band back through the first planar surface and toward a second focal region spaced apart from the first focal region. First and second light receivers are disposed nearest each respective focal region for receiving the first and second spectral bands.

The invention relates to a chromatic confocal technique method and arrangement for the rapid three-dimensional measurement, in particular, of object shape, more particularly of a tooth in the jaw of a human being with an array of polychromatic point light sources, a planar detector matrix, arranged before means for lateral spectral separation and an objective for object illuminating and recording. According to the invention, spectral defined reference light bundles are generated also using components of the arrays of point light sources for chromatic calibration, wherein said reference light bundles are injected into the detection beam path via a reference bean path for chromatic lateral separation and then focused on the detector matrix as reference image points. Spectral reference points are calculated at the detector matrix positions and sub-matrices for spectral analysis of object light are digitally stored with pixel accuracy by means of the above positions which then serve for obtaining measurement points such that the detector matrix may be completely filled out with oblong sub-matrices, the planar array is arranged on the planar detector matrix rotated about an acute angle to the spectral axis, wherein the rotation is carried out about the optical axis (OA) of the arrangement, such that a connecting line of point light sources on projection thereof in the plane of the detector matrix includes an acute angle there with the spectral axis, the λ-axis.

A spectroscopic sensor that applies lights in a wavelength band containing plural wavelengths to an object and spectroscopically separates reflected lights or transmitted lights from the object using plural light band-pass filters that transmit the respective specific wavelengths and plural photosensor parts to which corresponding transmitted lights are input based on output results of independent photosensors. The spectroscopic sensor may be integrated in a semiconductor device or module by integration using a semiconductor process and downsizing may be realized.

The present invention relates to an optical device for splitting incident unpolarized white light into simultaneously spectrally separated and orthogonally polarized light beams having complementary primary color bands by using interference filters for primary color bands such as the Infitec filters. The optical device embodying the present invention can be used in, for example, illumination systems for passive stereoscopic 3D display systems. When used in the stereoscopic 3D display system, the present invention provides a high degree of spectral and polarization separation of the individual stereoscopic images and the increased efficiency in use of illumination light compared to the conventional stereoscopic projection systems.

Fast kV-switching is a dual energy acquisition technique in computed tomography (CT) in which alternating views correspond to the low and high tube voltages. Its high temporal resolution and its suitability to a variety of source trajectories make it an attractive option for dual energy data acquisition. Its disadvantages include a one-view misregistration between the data for high and low voltages, the potentially poor spectrum separation due to the more-like a sine wave rather than the desired square wave in fast kV-switching, and the higher noise in the low voltage data because of the technical difficulty in swinging the tube current to counter the loss of x-ray production efficiency and loss of penetration at lower tube voltages. Despite the disadvantages, symmetric view matching according to the current invention substantially improves streaks and other artifacts due to the view misregistration, sufficient spectrum separation even in a sinusoidal waveform swinging between 80 kV and 135 kV, and contrast-to-noise for the simulated imaging task maximized at monochromatic energy of 75 keV.

The invention relates to the fields of digital medicine and computer-assisted surgery, and provides a virtual surgery simulation method and a device of the virtual surgery simulation method. The virtual surgery simulation method comprises the following steps of: (1) carrying out CT plain scanning on a craniomaxillofacial region to obtain scanned data; (2) carrying out three-dimensional reconstruction on bone tissue according to the scanned data by utilizing a computer, and simulating the operation of osteotomy to establish a dendritical structure model of a craniomaxillofacial bone; (3) carrying out bone block three-dimensional space observation at any angle of view on a virtual reality interactive operation platform by an operator who wears a pair of spectral separation stereo glasses to assist the operator in preoperative design; and (4) carrying out bone block three-dimensional space rotating and shifting simulation on the dendritical structure model of the craniomaxillofacial bone in a virtual reality space by the operator who wears a pair of data gloves, and producing real-time force feedback perception by a haptic feedback device which is connected with the computer to assist the operator in surgery simulation. The method and the device are strong in immersion and interaction, simple, efficient and easy to operate.

Spectral separation filters for channels of a 3D image projection incorporate passbands of primary colors. In at least one of the filters, passbands are present in more than 3 primary colors. A set of two filters include a first filter having passbands of low blue, high blue, low green, high green, and red, and a second filter having passbands of blue, green, and red. The additional primary passbands of the first filter allow for an increased color space in projections through the filters compared to filters only having red, green, and blue primaries. The added flexibility of the increased color space is utilized to more closely match a color space and white point of a projector in which the filters are used.

Each pixel of an array substrate is provided with a reflective region and a transmittance region. A first color filter layer is provided between each pixel electrode and a gate insulating film of the array substrate. The first color filter layer of each pixel has spectral characteristics corresponding to the second color filter layer that is provided in association with the reflective region of the pixel. Each reflective region is a region where image display is enabled by light that passes through the corresponding second color filter layer and is reflected by its reflection layer. Each transmittance region is a region where image display is enabled by light that is emitted from a backlight and passes through the corresponding first color filter layer. Spectral separation by the first color filter layers and the second color filter layers enables the liquid crystal element to display an image.

A spectral photometer intended for integration purposes includes a measurement head equipped with illumination arrangement (10) including at least one light source (11) for the illumination at an angle of incidence of 45° of a measured object and located in a measurement plane (M), a pickup arrangement (20) for capturing the measurement light remitted by the measured object at an angle of reflection of essentially 0° relative to the perpendicular to the measurement plane, a spectrometer arrangement (30) including an entry aperture (31) for the spectral splitting of the measurement light captured and fed through the entry aperture, and a photoelectric receiver arrangement (32) exposed to the split measurement light for conversion of the individual spectral components of the measurement light into corresponding electrical signals. It further includes an electronic circuit (100) for control of the light source (11) and forming digital measurement values from the electrical signals produced by the photoelectric receiver arrangement. The light source (11) is constructed as a cosign beamer and located in such a way that its main radiation direction is essentially parallel to the main beam (21) of the remitted measurement light and the mean distance of the light source from the main beam of the remitted measurement light being essentially the same as the distance of the light source (11) from the measurement plane (M). The light source (11) includes a combination of two or more light emitting diodes of different spectral characteristics located in one plane and preferably positioned on a common carrier, whereby the plane is oriented essentially parallel to the measurement plane (M). The spectrometer arrangement (30) includes a pot-shaped spectrometer housing (34) made of plastic with an essentially cylindrical mantle (34a) and a removable cover. A concave diffraction grating (35) is positioned coaxially to the mantle in the spectrometer housing and rests on an annular shoulder (34c) formed on the mantle and preferably shaped complementary to the diffraction grating. The cover (34b)forces the diffraction grating (35) against the annular shoulder (34c) at a predefined force by way of a compression spring (36). The spectrometer housing (34) is with an end opposite the cover positioned on a printed circuit plate (33) including the entry aperture (31) and the photoelectric receiver arrangement (32) and fixed to the printed circuit plate (33) by a clamping spring (37). The pickup arrangement (20) is directly mounted on that side of the printed circuit plate (33) which is opposite the side of the spectrometer housing (34).

The invention belongs to the technical field of remote sensing image processing, and particularly discloses a Fisher judged null space based method for decomposing mixed pixels of a high-spectrum remote sensing image. A Fisher judged null space method is provided aiming at the problem that the decomposition precision is reduced due to the phenomenon of same objects and different spectrums generally existing in the mixed pixel decomposition. The method comprises the following steps: analyzing a training sample consisting of pure pixel spectrums of an end member, constructing an intra-class scattering matrix null space of the training sample, making the spectrum difference in the end member become null, searching a judgment vector causing the scattering degree of the intra-class scattering matrix to be maximum in the null space, and making the separation degree of end member spectrums of different classes maximum so as to furthest reduce the decomposition error caused by the same objects and different spectrums. The method of the invention has particularly important application values in the aspects of high-precision surface feature decomposition of the high-spectrum remote sensing image and detection and identification of ground targets.

To provide a defect inspection apparatus for inspecting defects of a specimen without lowering resolution of a lens, without depending on a polarization characteristic of a defect scattered light, and with high detection sensitivity that is realized by the following. A detection optical path is branched by at least one of spectral splitting and polarization splitting, a spatial filter in the form of a two-dimensional array is disposed after the branch, and only diffracted light is shielded by the spatial filter in the form of a two-dimensional array.

Devices and methods for hyperspectral and multispectral imaging are discussed. In particular, methods like mapping spectrometer systems, methods of use and fabrication are given. Generally speaking, an image mapping spectrometer includes an image mapping field unit, a spectral separation unit, and a selective imager. Image mapping spectrometers can be used for spectral imaging of optical samples. In some embodiments, the image-mapping field unit of the image-mapping spectrometer can be fabricated using surface-formed diamond tools.

A method and a computer program product for sample rate conversion that features distributive or hybrid filtering to reduce unwanted artifacts, such as aliasing and the computational requirements to avoid the aforementioned artifacts. The method includes receiving, at a first sample rate, a plurality of data points, associated with a first signal, operating on the plurality of data points to associate the signal with a predetermined set of parameters, with the set of parameters including a first transition band having an image associated therewith; and varying the sample rate associated with the first signal by interpolation with an interpolator having associated therewith a second transition band, with the width associated with the second transition band being a function of a spectral separation between the first transition band and its image, wherein a second signal is produced having a sequence of data samples approximating the first signal.

A system and optimization algorithm for determining the preferred operational wavelengths of a device configured for measurement of molecular analytes in a sample. Operational wavelengths are determined by solving a system of equations linking empirically defined functions representative of these analytes, spectrally dependent coefficients corresponding to these analytes, path lengths traversed by waves probing the analytes at wavelengths corresponding to the absorption level described by the functions representative of these analytes, and, optionally, a cost-function taking into account at least one of spectral separation between the operational wavelengths, manufacturability of wave source(s) producing wave(s) at operational wavelength(s), and the noise factor associated with the operation of such wave source(s).

An ink-jet ink set comprising three colour inks each containing at least one pigment, wherein, the first colour ink has a maximum absorbance Amax between 400 and 500 nm and an absorbance Aref at a reference wavelength of 600 nm, the second colour ink has a maximum absorbance Amax between 500 and 600 nm and an absorbance Aref at a reference wavelength of 650 nm, the third colour ink has a maximum absorbance Amax between 600 and 700 nm and an absorbance Aref at a reference wavelength of 830 nm, characterized in that each colour ink has a spectral separation factor SSF larger than 70 with SSF=Amax / Aref. A method for preparing the ink-jet ink set is also disclosed.

A filter wheel having spirally shaped left and right channel 3D filters. The 3D filters are, for example, spectral separation filters. The filter is mounted, for example, close to an integrating rod output of a projector. The left and right channel filtered light scrolls across a modulation device which is energized with correspondingly scrolling left and right image data. In one embodiment, the integrating rod comprises mirrored surfaces to facilitate recycling of light reflected off the filter wheel. The filter wheel may be placed in a single or dual projector configuration. In one embodiment, the filters are fixed at the end of an integrating rod using “re-cycled” light to illuminate different channels of a projection system.

The invention discloses a portable three-channel near-deep-UV Raman spectrometer. The spectrometer comprises a near-deep-UV laser emitter, a laser spot shaping device, a first beam splitter, a zooming or non-zooming lens, a second beam splitter, a third beam splitter, a relay optical system, a point-to-line optical system, a spectrum forming system, an optical or mechanical sample scanning system and a data processing and wirelessly transmitting-receiving system. After Raman, fluorescent and visible / laser channels are fused in the point-to-point manner in real time, the whole sample is scanned, and data processing such as spectral separation, peak positioning, spectral library establishment and substance identification is carried out. The portable three-channel near-deep-UV Raman spectrometer has the advantages including that the flexibility and resolution are high, illumination points are large, the detection distance is long, rapid onsite non-contact measurement can be implement in the sun, and the spectrometer is relatively safe for the eyes.

A dual-band semi-active laser (SAL) sensing system incorporating a dual-passband filter. According to one example, a semi-active laser sensing system includes a detector assembly and an aperture lens. The SAL sensing system further comprises a dual-passband filter having a stopband, a first passband and a second passband, the first and second passbands being distinct and non-overlapping and spectrally separated from one another by a portion of the stopband, the filter being configured to receive the electromagnetic radiation from the aperture lens and to filter the electromagnetic radiation to pass a first wavelength range within the first passband and a second wavelength range within the second passband. The SAL sensing system further includes a lens assembly configured to receive the first and second wavelength ranges from the filter and to focus the first and second wavelength ranges onto the detector assembly.

The method includes techniques of spectral time sequence multiplexing and spectral separation. The procedure includes following arranged steps: using laser in three different wavelengths as illumination light at different delta t pulse time intervals illuminate flow field to be measured; three independent CCDs record image for same object space; each CCD records particle image illuminated by corresponding wavelength; eliminating measuring upper limit of cross correlation DPIV. The device includes pulsed laser, time schedule controller for pulsed laser, beam splitter and multiple CCD camera. Advantages are: full-field measurement and high measuring precision.