Abstract:
This invention is a solid-state spectrometer for the non-invasive generation and capture of thermal gradient spectra from human or animal tissue. The spectrometer includes an infrared transmissive thermal mass window (202) for inducing a transient temperature gradient in the tissue by means of conductive heat transfer with the tissue, and a cooling element in operative combination with the thermal mass window for cooling the thermal mass window. Further, an infrared sensor (106) is provided for detecting infrared emissions emanating from the tissue (50) as the transient temperature gradient progresses into the tissue, and for providing output signals proportional to the detected infrared emissions.
Abstract:
A wavelength division multiplexer (WDM) including a support structure that is coupled to at least one optical component. A diffraction grating is optically coupled to at least one optical component coupled to the at least one optical component. A frame is coupled to the diffraction grating. Pins may be coupled between the support structure and the frame to substantially thermally isolate the support structure from the frame. The pins may be substantially geometrically equally spaced and have approximately the same exposed length extending from the lens barrel. The pins may have the same coefficient of thermal expansion as the support structure.
Abstract:
A monitor device and method for monitoring operating conditions of a wavelength division multiplexed optical signal. The monitor device includes an optical engine for receiving the multiplexed optical signal and generating a plurality of demultiplexed optical signals. An array of optical detectors is disposed to receive the demultiplexed optical signals from the optical engine. The demultiplexed optical signals form spots on the array of optical detectors. At least one spot is wider than a center-to-center dimension spanning two optical detector elements in the array of optical detectors.
Abstract:
The invention is a temperature compensating structure for a fiber Bragg grating (FBG) contained in optical fiber (11). The structure comprises two plates (12, 13) made of material having different temperature coefficients of expansion and bonded together. The optical fiber (11) is bonded to the exposed surface of the plate (12) having the lower temperature coefficient. The structure bends with changes in temperature and produces an elongation of the fiber (11) with decreasing temperature.
Abstract:
A portable colorimeter housing (100) has an upper portion (103) which is mounted on a lower portion (101) in a cantilever fashion and is adapted to receive sheets larger than the device for purposes of obtaining tri-stimulus color measurements. An adjustable paper guide (119) determines the distance that a sheet is inserted between upper (163) and lower (161) plates. A sheet to be measured inserted in the opening (109) will operate a micro switch (139) which activates a motor operative to advance the sheet between a motor driven drive wheel (135) in the lower plate (161) and an idler roller in the upper plate (171). Transmittance or reflectance measurements are taken by means of photodetector cells (242) including colorimetric filters. A user programmable processor performs pattern recognition and control functions.
Abstract:
La présente invention se rapporte à un dispositif de télédétection (20), en particulier pour le suivi de l'évolution de cultures agricoles, comprenant une seule voie optique (4, 5), et une pluralité de capteurs élémentaires (8 xy ) agencés suivant une matrice (8) de forme prédéterminée, dans lequel chaque capteur élémentaire (8 xy ) est un capteur multi-spectral, en particulier sensible sur une pluralité de bandes spectrales, de préférence au moins sur une bande spectrale dans le domaine visible (B, V, R) et une bande spectrale dans le proche infrarouge (IR). La présente invention se rapporte également à un système de télédétection employant un tel dispositif de télédétection (20).
Abstract:
The invention relates to an optical sensor device which measures in a spatially resolving manner. In order to devise such a sensor device with which a contacting measurement of the article to be measured can be carried out and which can be mass-produced, the sensor device is designed such that a transfer of the calibration onto individual sensor devices is possible with high accuracy. According to certain embodiments of the design of the sensor device and of the evaluation methods, interferences with the measurement of the amount of the target substance are minimized.
Abstract:
A spectrometer configurable for field analyses of chemical properties of a material is provided. The spectrometer includes: at least one sensor adapted for providing Fourier transform infrared spectroscopy (FTIR) surveillance and at least another sensor for providing Raman spectroscopy surveillance. The spectrometer can be provided with a user accessible instruction set for modifying a sampling configuration of the spectrometer. A method of determining the most likely composition of a sample by at least two technologies using the spectrometer is also provided.
Abstract:
The invention relates to a lens main part (10) for a spectrometer for mounting other components (18, 24, 28) of a spectrometer, the lens main part being produced as a sandwich construction from at least three flat elements (12, 14, 16) arranged one on top of the other and interconnected, in particular bonded, each of said flat elements (12, 14, 16) having a low coefficient of thermal expansion which is substantially isotropic, at least on one isotropic plane. The flat elements (12, 14, 16) are arranged on top of one another and interconnected such that their isotropic planes run substantially parallel to one another.