Abstract:
A multispectral staring array (10) comprises, amongst other things, at least two sensors (28, 30) where each sensor is adapted to detect an image in a different predetermined spectral sensitivity; a first lens (14) to focus capture spectral bands; a spectral filter (20, 22) between the lens (14) and the sensors (28, 30) to subdivide the incident spectral bands; and a second lens (24, 26) to direct and focus the subdivided incident spectral bands on each of the sensors (28, 30).
Abstract:
A multi-angle colorimeter (100) employs a multi-angle mode and a symmetrical arrangement mode in an optical arrangement. Light detection on both sides of the symmetrical arrangement is performed by a single photodetector unit (41). The photodetector unit (41) is used on both sides, and thus, the device becomes simpler, without any impact on individual difference in characteristics of multiple photodetector units. Conversely, elements for illumination can be used on both sides. Also in a case where multiple photodetector units are used, the size and cost of the device can be reduced with the use of a photodetector unit having a relatively low wavelength resolution as a photodetector unit to be used on one side. This enables to reduce an attitude error due to relative tilting of a measurement surface while reducing the size and cost of the device.
Abstract:
Disclosed is a highly reliable optical fiber measurement device and measurement method having a simple and compact structure. The device includes a planar liquid holder having a plurality of liquid holding portions arranged along a flat face; a plurality of light receiving optical fibers for transmitting fluorescence generated in the liquid holding portions; a plurality of light emitting optical fibers for transmitting excitation light into the liquid holding portions; a measurement head capable of being positioned in the each liquid holding portion while supporting a plurality of measurement ends having a bundle of one light receiving end of the light receiving optical fibers and one light emitting end of light emitting optical fibers; a light reception selecting element that, by sequentially selecting one by one from plural the light receiving optical fibers and sequentially selecting one by one from plural kinds of wavelength or wavelength bands, sequentially guides the light of the selected wavelength or wavelength band of the fluorescence received by the selected light receiving optical fibers to one photoelectric element; and a photoelectric element for sequentially conducting photoelectric conversion on the guided fluorescence.
Abstract:
A tool for measuring properties of a formation fluid downhole within a wellbore is described. The tool comprises a port for obtaining a sample of fluid downhole and a spectroscope. The spectroscope includes an adaptive optical element, a light source, and at least two detectors. The adaptive optical element is capable of directing a first wavelength band along a first light path and a second wavelength band along a second light path when both said bands are simultaneously incident thereon. The spectrum of the light source is spectrally dispersed across the adaptive optical element in such a way that a first wavelength band is directed along the first light path, through the sample, and to one of the detectors, and a second wavelength band is directed along the second light path to a second of said at least two detectors.
Abstract:
A tool for measuring properties of a formation fluid downhole within a wellbore is described. The tool comprises a port for obtaining a sample of fluid downhole and a spectroscope. The spectroscope includes an adaptive optical element, a light source, and at least two detectors. The adaptive optical element is capable of directing a first wavelength band along a first light path and a second wavelength band along a second light path when both said bands are simultaneously incident thereon. The spectrum of the light source is spectrally dispersed across the adaptive optical element in such a way that a first wavelength band is directed along the first light path, through the sample, and to one of the detectors, and a second wavelength band is directed along the second light path to a second of said at least two detectors.
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).