Abstract:
A method for spectral analysis of the light proceeding from a specimen using a multi-band detector comprises the steps of defining an overall spectral region; from the overall spectral region, defining a first spectral subregion and defining at least a second spectral subregion; simultaneously detecting the light proceeding from the specimen in the first and the second spectral subregion, and generating detection values; displacing the first spectral subregion and displacing the second spectral subregion within the overall spectral region; and repeating steps c) and d) until the light has been detected over the entire overall spectral region.
Abstract:
An optical channel monitor (OCM) or filter for analyzing an incident light carrying a number of narrow band signal channels such as WDM or DWDM channels. The OCM or filter use an acousto-optic tunable filter to receive and refract from an incident light a refracted light such that the refracted light contains a test channel with a center frequency &ngr;0. A first birefringent element is provided for filtering from the refracted light a first polarized light and a second polarized light orthogonal to the first polarized light. The transmission curves are engineered such that the transmissions of the first and second polarized light are substantially equal at the center frequency &ngr;0 of the test channel. The OCM or filter has a second birefringent element for filtering from the first polarized light a first polarized portion and a second polarized portion. The transmission curves of the second birefringent element are set such that the transmissions of the first and second polarized portions are substantially equal at a first offset &dgr;1&ngr; from the center frequency &ngr;0.
Abstract:
A method of in situ analysis of a biological sample comprising the steps of (a) staining the biological sample with N stains of which a first stain is selected from the group consisting of a first immunohistochemical stain, a first histological stain and a first DNA ploidy stain, and a second stain is selected from the group consisting of a second immunohistochemical stain, a second histological stain and a second DNA ploidy stain, with provisions that N is an integer greater than three and further that (i) if the first stain is the first immunohistochemical stain then the second stain is either the second histological stain or the second DNA ploidy stain; (ii) if the first stain is the first histological stain then the second stain is either the second immunohistochemical stain or the second DNA ploidy stain; whereas (iii) if the first stain is the first DNA ploidy stain then the second stain is either the second immunohistochemical stain or the second histological stain; and (b) using a spectral data collection device for collecting spectral data from the biological sample, the spectral data collection device and the N stains are selected such that a spectral component associated with each of the N stains is collectable.
Abstract:
A fluorescent in situ hybridization method comprising the steps of (a) providing a cell nuclei having chromosomes hybridized with at least one nucleic acid probe including at least one nucleic acid molecule labeled with at least one fluorophore; (b) viewing the cell nuclei through a fluorescence microscope optically connected to an imaging spectrometer for obtaining a spectrum of each pixel of the cell nuclei by (i) collecting incident collimated light simultaneously from all pixels of the cell nuclei; (ii) passing the incident collimated light through an interferometer system so that the light is first split into two coherent beams and then recombine to interfere and form an exiting light beam; (iii) focusing the exiting light beam on a detector having an array of detector elements, so that at each instant each of the elements is the image of one and always the same pixel for the entire duration of the measurement and so that each of the elements produces a signal which is a particular linear combination of light intensity emitted by the pixel at different wavelengths; (iv) rotating or translating one or more of the elements of the interferometer, so that the optical path difference is scanned simultaneously for all the pixels of the cell nuclei; and (v) recording signals of each of the detector elements as function of time using a recording device to form a first spectral cube of data; and (c) interpreting the first spectral cube of data using a mathematical algorithm.
Abstract:
A solid state moisture gauge is disclosed in which a quartz-halogen bulb is used with an acousto-optic tunable filter to launch light of specific desired wavelengths into a parallel plate cavity device which contains or is adjacent to material having a moisture content which is to be measured. The light exiting from the parallel plate device is detected, converted to a digital signal and then stored in a computer for later comparison to the detection of light exiting from the parallel plate device of a different wavelength.
Abstract:
A spectral imaging method for simultaneous detection of multiple fluorophores aimed at detecting and analyzing fluorescent in situ hybridizations employing numerous chromosome paints and/or loci specific probes each labeled with a different fluorophore or a combination of fluorophores for color karyotyping, and at multicolor chromosome banding, wherein each chromosome acquires a specifying banding pattern, which pattern is established using groups of chromosome fragments labeled with various fluorophore or combinations of fluorophores.
Abstract:
The invention relates to a procedure for determining an identification of a sample of material, or its properties. Electromagnetic radiation from a radiation source (1) is reflected or transmitted through the sample. The radiation from the sample is collected and analyzed over several channels (7, 7', 7"), which modulate the radiation with a spectral transmission function which is unique for each channel. The modulated radiation is transmitted to one or several detectors (9, 9', 9") which produce output signals which are further electronically processed. The spectral range of each of the individual channels is common to all of the channels. Within the common range the channels are provided with different spectral transmission functions (7, 7',7") which are optimally chosen for a given application.
Abstract:
A tunable spectrometer includes an acousto-optical tunable filter disposed for filtering light from a discrete light source, wherein the light emerges from the filter in a simultaneous plurality of distinct beams having different orders of diffraction, with different diffraction orders having different wavelength ranges and with complementary pairs of said distinct beams having the same diffraction order respectively having substantially the same wavelength ranges. The filter is tuned to diffract light in a simultaneous plurality of distinct beams having different predetermined diffraction orders that have different wavelength ranges that include wavelengths that are characteristic of a spectrum for a given substance; and a set of a given plural number of detectors respectively detect the filtered light diffracted by the filter to thereby simultaneously provide test signals indicative of a spectrum within a spatial region of interest at wavelengths that are characteristic of the spectrum for the given substance. Another spectrometer that detects light at a wavelength that is characteristic of a Raman scattering spectrum for a given substance includes a test cell disposed within the spatial region of interest and including a plurality of mirrors disposed within the cell for reflecting the light to pass a plurality of round trips between the mirrors before emerging from the spatial region of interest to thereby enhance Raman scattering of the light by any molecules of the given substance within the cell while the light passes through the spatial region of interest.
Abstract:
A spectrometer is adapted to observe discrete wavelengths or spectral regions of a sample. The spectrometer includes a light source having spectral characteristics depending on the presence of a sample. A disperser consists of a chamber housing a diffraction grating in spaced relation to the light source and an entrance slit associated with the chamber for directing light from the source in a light path to be dispersed by the grating. An acousto-optic device is mounted in the chamber in the light path so that light traverses the device. A power supply applies an acoustic frequency to the acousto-optic device to set up a variation in refractive index within the acousto-optic device to deflect traversing light. A detector associated with the chamber is positioned relative to the grating to sense the presence of light where it appears after dispersion and to rapidly detect discrete wavelengths or spectral regions of the light.
Abstract:
An optical spectrum analyzer includes a surface elastic wave generator for generating in an optical waveguide a surface elastic wave which has a continuously varying frequency and which diffracts and deflects a guided wave as it travels across the path of the guided wave, which guided wave is introduced as a measured light beam into and travels in the optical wave guide. The measured light beam which has been deflected is emitted from the optical waveguide and detected by a light detector. A modulator turns on and off or modulates the surface elastic wave by repeatedly energizing and de-energizing the surface elastic wave generator, the frequency of the modulation being lower than the continuously varying frequency. A filter receives a signal corresponding to the modulation frequency from the modulator and a signal corresponding to the measured light beam from the detector, and extracts a signal component having the same frequency as the modulation frequency from the signal received from the light detector. The frequency of the surface elastic wave is detected on the basis of the signal component extracted by the filler when the measured light beam is detected by the light detector.