Abstract:
A three-step method for classifying plant embryo quality using Raman spectroscopy is provided. First, a classification model is developed based on Raman spectral data of reference samples of plant embryos or any portions of plant embryos of known embryo quality. The embryo quality may be known based on a comparison to a normal zygotic embryo or on actual planting of the embryo to observe its germination and subsequent growth. Then, a data analysis is carried out by applying one or more classification algorithms to the acquired Raman spectral data to develop a classification model. Second, Raman spectral data of a plant embryo or any portion of a plant embryo of unknown embryo quality are obtained. Third, the classification model developed in the first step is applied to the Raman spectral data obtained from the embryo (or any portions thereof) of unknown quality to classify the quality of this plant embryo.
Abstract:
An apparatus and method capable of providing IR spectral information using IR absorption phenomena requires no moving parts or Fourier Transform during operation. IR spectral information and chemical analysis of a sample in a sample containing functional groups is determined by using an IR source (310), a sampling accessory (330) for positioning the sample volume, an optically dispersive element (350), a focal plane array (FPA) arranged to detect the dispersed light beam, and a processor (380) and display (390) to control the FPA, and display an IR spectrograph. Fiber-optic coupling allows remote sensing, and portability, reliability, and ruggedness is enhanced due to the no-moving part construction. Use of the apparatus and method has broad industrial and environmental application, including measurement of thickness and chemical composition of various films, coatings, and liquids, and may also be used in a real-time sensing of hazardous materials, including chemical and biological warface agents.
Abstract:
The spectrum of light, inelastically scattered by a sample (16) is measured. The light is guided through a capillary (12) from and to the sample, at least in one of these directions, through the channel no inelastic scattering of light occurs which can form an interfering background when measuring on the sample. By guiding the light through the channel, inelastic scattering of this light is prevented and it becomes possible to guide scattered light back through the channel to spectral analysis equipment (14) without problems with inelastic scattering during the guidance of the light. Preferably, the light is guided through the channel of the capillary in both directions.
Abstract:
The present invention provides a sample tank having a window for introduction of electromagnetic energy into the sample tank for analyzing a formation fluid sample down hole or at the surface without disturbing the sample. Near infrared, mid infrared and visible light analysis is performed on the sample to provide a downhole in situ or surface on site analysis of sample properties and contamination level. The onsite analysis comprises determination of gas oil ratio, API gravity and various other parameters which can be estimated by a trained neural network or chemometric equation. A flexural mechanical resonator is also provided to measure fluid density and viscosity from which additional parameters can be estimated by a trained neural network or chemometric equation. The sample tank is pressurized to obviate adverse pressure drop or other effects of diverting a small sample.
Abstract:
An installation is provided for multi-dimensional non-linear imaging of a material comprising intrinsic chromophores, using laser scanning. This installation comprises i) at least one source (115) of time stamp pulses of synchronized photons, ii) means (12-14) for locally focusing the pulses on a material to cause its intrinsic chromophores to absorb groups of at least two synchronized photons to produce response photons, iii) means (22, 40, 53) for directing the response photons to at leat one collecting zone, iv) means (30-34) for collecting the response photons in the collecting zone(s) whatever their energy, v) processing means for converting the collected photons into data at least representative of their number and storing them in correspondence with at least the time stamp pulses that cause the material to produce the response photons, vi) means for scanning (11, 20) the pulses through a chosen area of the material, and vii) means for delivering from said data stored an image representative of said material chosen area, with a sub-millimeter resolution, and in function of the respective time stamp pulses of data.
Abstract:
The methods and apparatus 300 disclosed herein concern Raman spectroscopy using metal coated nanocrystalline porous silicon substrates 240, 340. In certain embodiments of the invention, porous silicon substrates 110, 210 may be formed by anodic etching in dilute hydrofluoric acid 150. A thin coating of a Raman active metal, such as gold or silver, may be coated onto the porous silicon 110, 210 by cathodic electromigration or any known technique. The metal-coated substrate 240, 340 provides an extensive, metal rich environment for SERS, SERRS, hyper-Raman and/or CARS Raman spectroscopy. In certain embodiments of the invention, metal nanoparticles may be added to the metal-coated substrate 240, 340 to further enhance the Raman signals. Raman spectroscopy may be used to detect, identify and/or quantify a wide variety of analytes, using the disclosed methods and apparatus 300.
Abstract:
In an optical measurement probe of the type which incorporates a window configuration suited to on-line process control and other applications this invention provides an improved technique for bonding such a window to probe body or process vessel. In general terms, the improvement arises through the use of a compression ring around the bonding area to maintain a consistent seal. In terms of apparatus, a hollow probe body terminates in a distal end having a flanged portion with an inner and outer wall that extends back into the body. The outer wall of the window is sealed against the inner wall of the flanged portion, with compression material urged against the outer wall of the flanged portion to pressurize the seal between the window and the inner wall of the flanged portion. In the preferred embodiment, the compression material is ring-shaped and exhibits substantially the same thermal expansion coefficient as the window. In the case where a sapphire window is used, titanium or Invar may be used for the compression material. The window may be generally cylindrical though, in the preferred embodiments, cork-shaped or spherical window are used.
Abstract:
Embodiments of devices and methods are provided that permit validation of analyte detection using both surface enhanced Raman spectroscopy (SERS) and surface plasmon resonance (SPR). In specific embodiments, a substrate having a surface suitable for SPR is provided, along with a source of electromagnetic radiation to interact with the surface and thereby elicit surface plasmon resonance characteristic of the analyte under study. In some embodiments, surface enhancing structures are also provided on the substrate, and analytes under study are associated with enhancing structures. Another source of electromagnetic radiation is directed at the analyte on the enhancing structures to produce surface enhanced Raman scattering. In certain embodiments, data obtained by these two methods are compared, thereby providing an internally consistent and self-validating method for analyte detection.
Abstract:
A micropulse lidar system is described that comprises, a laser light source for emitting a pulsed laser beam, beam shaping means for shaping the intensity distribution of said beam such that said beam has a substantially annular intensity distribution in cross-section, a Schmidt-Cassegrain telescope for transmitting the annular beam to an atmospheric target and for collecting backscattered light returned from said target, and means for detecting and analyzing said backscattered light. The system has higher efficiency and better signal-to-noise ration than a corresponding system without the beam shaping means. There is also a disclosed a method for optimising the design of the beam shaping means.
Abstract:
In accordance with the invention, the quality of hard gold is determined by Raman vibrational spectroscopy. A sample of the hard gold is provided, a monochromatic light beam is directed onto the sample, and the frequency and intensity of the light scattered by the sample is analyzed for the vibrational frequencies of polymer molecules. Scattering frequencies offset from the initial beam frequency by about 2132 cmnull1 and about 2182 cmnull1, for example, are indicative of high quality nickel-hardened gold.