Abstract:
A Raman spectrometer including a laser excitation source, edge filters, and detection optics that direct light into a spectrograph. A spectrograph containing a dispersive element and optics that directs various wavelengths of light onto a segmented diffractive MEMS light modulator array. The MEMS array, depending on actuation state, directs light either to or away from a single detector. Control electronics drive the MEMS light modulator for either sequential wavelength measurement or multiplexed wavelength measurement (Hadamard for example).
Abstract:
An apparatus for stripping fluids from the surface of a vehicle (26) including a plurality of dimensionally stable and substantially rigid bags (12) including an inlet (14) for introducing air under pressure into the bag (12) and an elongated opening at one end of the bag (12) defining a nozzle end (16,16') of smaller cross sectional area than the inlet (14) for emitting a stream of air. A support structure including an air distributor (18) supports the bag (12) to extend toward the object (26) wherein the nozzle end (16,16') of the bag (12) lies in the path of motion of the object (26) to cause physical engagement between the nozzle end (16,16') of the bag (12) and the object (26) to bring the stream of air emitted from the nozzle opening into close spacial relationship with the surface of the object (26) to strip fluid from the object. A bellows member (36) operatively connects the bag (12) to the air distributor (18) at one end to provide flexible joints for allowing hinging movement of the bag (12) substantially along a single axis. The bags (12) are self supporting from the air distributor (18).
Abstract:
An apparatus for stripping fluids from the surface of an object including a flexible, inflatable bag of generally rectangular transverse cross section including an inlet for introducing air under pressure into the bag and an elongated opening at one end of the bag defining a nozzle for emitting a stream of air and an air distributor for supplying air to the bag and for supporting the bag so that it extends toward the object wherein the nozzle end of said bag lies in the path of motion of the object to cause physical engagement between the nozzle end of the bag and the object to bring the stream of air emitted from the nozzle opening into close spacial relationship with the surface of the object.
Abstract:
A sampling accessory coupled to a hand-held reflectance spectrometer provides expanded sampling area which in turn provides better signal averaging from agricultural products which are often inhomogeneous. The sampling accessory includes a sample site repositioning means and a “sample cup” having a base that is transparent to near IR wavelengths.The hand-held reflectance spectrometer includes a shutter responsive to control signals from the control circuitry. When the shutter is closed, a reference measurement may be made. When the shutter is open, a sample measurement is taken.Sample repositioning and data acquisition within the cup may be performed by several means. Fresh sample regions may be exposed through either manual or motor driven sample cup rotation. Alternatively, the sample may be vibrated to induce fresh sample exposure at the window. A further embodiment includes illumination and/or detection paths that may be altered through electrically driven steering optics.
Abstract:
A nuclear magnetic resonance (NMR) system, and related method, develops two or more regression equations or models for a particular polymer property of interest (e.g., melt index or MI) during a calibration procedure using known samples of a material. The polymer material can be, for example, a plastic (e.g., polyethylene, polypropylene, or polystyrene) or a rubber (e.g., ethylene propylene rubber). Regression models for one or more discrete (i.e., two-valued) variables also are developed during calibration, and these models allow a prediction to be made about which of the two or more property (e.g., MI) models should be used for any particular sample of unknown material. The prediction obtained from the discrete variable model indicates which of the two or more models will produce the most accurate estimation of the property of interest for the unknown sample. The best model is thus selected, and then it is used to estimate the property of interest.
Abstract:
A pulsed nmr analysis system for polymers materials extracted from industrial processes at a mobility enhancing temperature (at or above glass transition temperature for amorphous polymers, at the crystalline transition temperature for crystalline and semi-crystalline polymers). The sample is measured via nmr techniques and results correlated to viscosity and melt index or melt flow (which are related to average molecular weights). The nmr system (in or out of resonance) includes: sample throughput system (P, LI, V1, V2) and user system controls (104) to establish digitized free induction decay curves (C), from which components functions are determined using linear or non-linear regression techniques to correlate the curve components to the target nuclei and to flow rates in plastics. Substantial improvement of correlation of nmr derived constants and equations of a free induction decay curve with the foregoing polymer properties is obtained via (1) conducting the nmr process at a mobility enhancing temperature (normally elevated compared to the industrial process temperature of the industrial process) and (2) holding temperature substantially constant at such elevated temperature.
Abstract:
Apparatus and process for measuring mass flow of a slurry mixture of two components of materials, such as a flow of catalyst solid particles (the first component) or droplets in a fluid carrier (the second component). The slurry mixture is added to a process stream (10) or batch reactor. The flow velocity and the volume fraction of one component are measured and combined with the known specific gravity, of the component being measured, and the physical dimensions of the pipe, in which the slurry mixture is flowing, to determine the mass flow of the component. The flow velocity is measured by correlating signals at two separated locations along the flow path, and the volume fraction is measured by combining the known dielectric constants of each of the materials in the mixture and the measured capacitance of the mixture. The capacitance is measured from electrodes which may be isolated from the flowing materials in some applications, but not isolated from the flowing materials in other applications. The temperature (9) and pressure (11) are compensated in the final calculation, and the mass flow result is used to control, via feedback, the amount of such materials delivered. Also, a subtraction technique to remove interfering power line noise is implemented to improve sensitivity.
Abstract:
A dielectrometry apparatus for measuring the dielectric properties of a material, the apparatus including a casing adapted to be at least partially implanted into the material, the casing having a cavity defined by an opening which is capable of receiving a portion of the material upon implantation, a first electrode disposed within the cavity to make electrical contact with the material upon implantation, a second electrode disposed within the cavity in a spaced-apart relationship to the first electrode, the first and second electrode being adapted to make electrical contact with the material upon implantation, whereby dielectric measurements can be taken of the material in the cavity, a porous spacer for defining a fixed distance between the first and second electrodes and adapted for saturation with the material upon implantation, and a selectively permeable cover disposed across the opening of the cavity for permitting migration of the material upon implantation while excluding fillers that could interfere with the dielectric measurements.
Abstract:
An apparatus (10) for stripping fluids from the surface of a vehicle includes an air distributor (28) and inflatable bags (14-26), each of generally rectangular transverse cross section. The bags (14-26) are supported by the air distributor (28) and each of the bags (14-26) includes an inlet end (40) connected to the air distributor (28) for introducing air under pressure into the bags (14-26) and a nozzle end (42) of smaller area than the inlet end (40) spaced apart from the inlet end (40) for emitting a stream of air while maintaining the bags (14-26) in a nonflailing orientation and substantially rigidly inflated. The invention is characterized by a connector strap (44) having one end portion (46) secured to a first of the bags (14, 18) and a second end portion (48) secured to a second of the bags (16, 20) and spaced along the bags (14-20) from the air distributor (28) for connecting the first bag (14-18) to the second bag (16-20) for properly positioning the second bag (16-20) in relation to a vehicle body when the first bag (14, 18) is deflected by the engaging vehicle (34).