Abstract:
The present invention provides a spectroscopic system as well as a method of autonomous tuning of a spectroscopic system and a corresponding computer program product. By detecting the position of return radiation in a transverse plane of an aperture of a spectroscopic analysis unit, a control signal can be generated that allows to drive servo driven translation or tilting stages of optical components. In this way a transverse misalignment of a spectroscopic system can be effectively detected. Generally, a plurality of different detection schemes are realizable allowing for an autonomous tuning of the spectroscopic system and for autonomous elimination of misalignment of a spectroscopic system.
Abstract:
Disclosed is an integrated circuit (100) comprising a substrate (110) carrying a plurality of light-sensitive elements (112) and a blazed grating (120) comprising a plurality of diffractive elements (122) for diffracting respective spectral components (123-125) of incident light (150) to respective light-sensitive elements (112), the blazed grating (120) comprising a stack of layers, at least some of these layers comprising first portions, e.g. metal portions (202, 222, 242) arranged such that each diffractive element (122) comprises a stepped profile of stacked first portions with a first portion in a higher layer laterally extending beyond a first portion in a lower layer of said stepped profile.
Abstract:
A multi-channel detector assembly (100) for downhole spectroscopy has a reference detector unit (110) optically coupled to a reference channel (50) of a source (40) and has a measurement detector unit (120) optically coupled to a measurement channel (60) of the source (40). The reference and measurement detectors (110,120) detect spectral signals across a spectral range of wavelengths from the reference and measurement channels (50,60). Conversion circuitry converts the detected spectral signals into reference signals and measurement signals, and control circuitry (130) processes the reference and measurements signals based on a form of encoding used by the source (40). Then, the control circuitry (130) can control the output of spectral signals from the source (40) based on the processed signals or scale the measurement signal to correct for source (40) fluctuations or changes in environmental conditions.
Abstract:
A spectrometer is provided with an integrating sphere 20, inside which a sample S of a measurement target is disposed and which is adapted for observing measured light emitted from the sample S, and a Dewar vessel 50 which retains a refrigerant R for cooling the sample S and at least a portion of which is located so as to face the interior of the integrating sphere 20. Gas generated from the refrigerant R is introduced through predetermined gaps G1-G6 functioning as a gas introduction path and through a plurality of communicating passages 64 formed in a support pedestal 61, into the integrating sphere 20. The gas introduced into the integrating sphere 20 absorbs water in the integrating sphere 20 to decrease the temperature in the integrating sphere 20, so as to prevent dew condensation from occurring on a portion of a second container portion 50b of the Dewar vessel 50 exposed in the integrating sphere 20. This can prevent occurrence of dew condensation even in the case where the sample S is measured in a cooled state at a desired temperature.
Abstract:
A downhole fluid analysis tool (10) has a tool housing and a fluid analysis device (30). The tool housing is deployable downhole and has at least one flow passage for a fluid sample. The fluid analysis device (30) is disposed in the tool housing relative to the flow passage. Inside the device (30), one or more sources (32,110,510) generate a combined input electromagnetic signal across a spectrum of wavelengths, and preferably a routing assembly (130) routes generated signals into reference and measurement channels (140,150). Preferably at least one wheel (202,210,220,250) having a plurality of filters (204,212,222) is rotated to selectively interpose one or more of the filters in the paths of the reference and measurement channels (140,150).
Abstract:
The present invention concerns a device for sorting and concentrating electromagnetic energy impinging a surface of said device, said surface comprising at least one plasmonics-based surface structure or similar structure of periodic or quasi-periodic surface topography. Device characterised in that said surface (V) is provided with at least two such surface structures (2), acting as individual concentrator structures, which are at least partially spatially overlapped or superposed.
Abstract:
Devices (1) for monitoring light (2) coming from different areas comprise first components (10) for selecting light coming from a particular area, second components (20) for filtering the selected light, third components (30) for sensing the filtered light, and fourth components (40) for in response to an output signal of the third component (30) determining spectra of the sensed light and for calculating color parameters such as color points and/or color rendering indices from the spectra. The first components (10) may comprise light angle selectors and redirectors (11), such as rotational mirrors (110) and rotational apparatuses (112), and light angle restrictors (12), such as high aspect ratio structures with absorbing walls (120) or circular holes (121). The second components (20) may comprise filter arrays (21). The third components (30) may comprise sensor arrays (31). The fourth components (40) may comprise controllers (43) for determining the spectra based on prior knowledge of light sources (6) or by using pseudo inverse matrix techniques. Memories (44) may store device information, color matching functions, reflection curves and standardized data for a color metric calculation.
Abstract:
The invention relates to a spectrometry device that comprises: a lighting device (LSCR) for generating a light beam covering a wavelength band, a probe arranged so that the light beam from the lighting device interacts with a fluid to be analysed, and a spectral analysis device arranged for receiving the light beam after interaction with the fluid to be analysed, and for providing light intensity measures for different wavelength ranges, wherein the lighting device includes a plurality of light-emitting components (1a-1c) emitting light in separate wavelength ranges, and a mixing optical component (3) attached to the emitting surface of the light-emitting components (1a-1c) for combining the light flows emitted by the light-emitting components into a resulting light beam covering the wavelength band and for guiding the resulting light flow towards the probe.