Abstract:
An optical filter array includes a substrate permeable to an electromagnetic radiation to be detected, a first DBR mirror arranged on the substrate, a second DBR minor arranged above the first DBR mirror, and a plurality of cavity sections. The cavity sections have different respective optical lengths, and are arranged so as to be spatially separated from each other between the first DBR mirror and the second DBR mirror. Each of the first DBR mirror, the second DBR mirror, and the plurality of cavity sections with different optical lengths form filter elements of a filter. The filter reflects in a stopband determined by the first DBR mirror and the second DBR mirror. Each filter element has at least one narrow transmission band determined by the optical length of its respective cavity section located inside the stopband. A different thicknesses of the cavity sections is provided via a nanoimprint process.
Abstract:
Systems and methods for dual-mode optical sensing are provided. One system includes a focal-plane array (FPA) imaging detector configured to detect light of a first wavelength range and an illuminated-spot locating detector (ISLD) including an array of light-detecting elements configured to detect light of a second wavelength range, wherein the ISLD has a transparency to light of the first wavelength range. The system further includes a wavelength-selective optical diffuser configured to diffuse light of the second wavelength range, wherein the shortest wavelength of the first range is larger than the longest wavelength of the second range, the ISLD is positioned such that the light to be detected by the FPA imaging detector first passes through the ISLD, and the FPA imaging detector, the ISLD and the wavelength-selective diffuser share a common optical axis.
Abstract:
A smartphone is adapted for use as an imaging spectrometer, by synchronized pulsing of different LED light sources as different image frames are captured by the phone's CMOS image sensor. A particular implementation employs the CIE color matching functions, and/or their orthogonally transformed functions, to enable direct chromaticity capture. A great variety of other features and arrangements are also detailed.
Abstract:
Disclosed is a spectrum measuring apparatus for shortening such a measurement time period for an object being measured including two or more mutually different measurement portions as is required for the spectrum measurements of the lights from individual measurement portions. The spectrum measuring apparatus comprises a slit group having two or more slits, a spectroscope for separating the lights extracted by the slit group, for the individual slits, and a measuring unit for measuring the intensities of the individual components, which are separated by the spectroscope, for the slits. The individual slits extract such ones of the lights coming from an object being measured including two or more mutually different measurement portions, as come from the individual measurement portions.
Abstract:
A confocal laser scanning microscope for examining a sample has a light source, which generates an illumination light beam, and a scanning unit which deflects the illumination light beam such that it optically scans the sample. A main beam splitter separates the illumination light beam from detection light emerging from the sample. The detection light separated from the illumination light beam passes at least partially through a detection pinhole diaphragm. At least two detector units detect the detection light passing through the detection pinhole diaphragm. An optical element is arranged in the beam direction between the detection pinhole diaphragm and the detector units and splits the detection light into at least two beam bundles and spectrally decomposes it within the beam bundles.
Abstract:
A method for accurately counting desired cells or microorganisms (viable bacteria) in a sample fluid in which contaminants are included is provided. One or plural types of membrane-permeable fluorochromes whose fluorescence amount is amplified by binding to a nucleic acid and glycerin are added to a sample fluid containing cells or microorganisms to be counted and allowed to stand for a certain time. Glycerin is added before or after or simultaneously with the mixing of the sample fluid and the fluorochrome(s). The cells or microorganisms to be counted are counted by staining the cells or microorganisms to be counted, followed by irradiating with light having a specific wavelength to detect the fluorescence emitted from the cells or microorganisms.
Abstract:
Systems, including apparatus and methods, for obtaining and/or correcting images, particularly from atmospheric and/or other distortions. These corrections may involve, among others, collecting two or more sets of image data corresponding to images of the same scene in different wavelength regimes, and using correlations between wavelength and expected distortion to distinguish apparent image motion due to distortion from apparent image motion due to object or scene motion. These systems may be useful in any suitable imaging context, including navigation, targeting, search and rescue, law enforcement, commercial video cameras and/or surveillance, among others.
Abstract:
An optoacoustic system includes first and second light sources capable of generating pulse of light at first and second wavelengths, first and second electrically controlled optical attenuators, first and second light sync detectors, and a combiner. A power meter that is calibrated to determine power at the first and second predominant wavelength measures power at the first wavelength after the first light sync is detected and measures power at the second wavelength after the second light sync is detected. The system includes a calibration mode wherein it electrically attenuates the first optical attenuator when the power measured by the power meter at the first wavelength after the first light sync is detected is above a first level, and electrically attenuated the second optical attenuator when the power measured by the power meter at the second wavelength after the second light sync is detected is above a second level.
Abstract:
A method of spectral-spatial-temporal image detection is disclosed. In one embodiment, a spectrally differenced image is obtained by computing a difference of at least two intensity values in at least two spectral bands of an image. Further, a spatially filtered spectral image is obtained by applying a spatial median filter to the obtained spectrally differenced image. Furthermore, a temporal image is obtained by determining a temporal pixel value difference using a computed predictive frame difference. In addition, a spectral-spatial-temporal filtered image for detection is obtained by using the obtained spatially filtered spectral image and the temporal image.
Abstract:
The invention discloses a low stray light polychromator comprising an optical housing, an entrance slit, a dispersion system and an array detector. The dispersion element of the dispersion system is a grating. A photosurface of the array detector is obliquely intersected with a principal section of the grating. In the invention, by changing the relative operation of optical elements in the polychromator, the stray light generated by the unexpected reflection on the photosurface of the array detector is exactly reflected out from the expected optical path. In addition, on the inner wall of the optical housing, small diaphragms for extinction are disposed in a plane in which reflection faculaee are projected, thus stray light will be reduced greatly.