Abstract:
A method for graphically forming a difference spectrum from a sample spectrum and a reference spectrum on a computer system includes displaying an initial difference spectrum on the display the initial difference spectrum being equal to the sample spectrum, selecting a data point in the initial difference spectrum, having an associated wave number, with a relative pointing device on the display, moving the data point a measurable amount on the display with the relative pointing device, determining a scaling factor in response to the measurable amount and to a data point in the reference spectrum having the same associated wave number, scaling each data point in the reference spectrum by the scaling factor to form a scaled reference spectrum, determining the difference spectrum between the sample spectrum and the scaled reference spectrum, and displaying at least a portion of the difference spectrum on the display.
Abstract:
A method for correcting an instrumental error due to wavelength error of a spectroscope of an optical analyzer for measuring an optical density reflected from or transmitted through a dry analysis element. One standard color plate having a standard optical density OD.sub.ST is measured by an optical analyzer to be corrected to obtain an measured value OD.sub.M. A measured optical density OD.sub.S of the element applied with a sample through the optical analyzer to be corrected is corrected by using a ratio of OD.sub.M /OD.sub.ST to obtain a corrected measured value OD.sub.C of the sample. The standard color plate to be used contains an indicator dye contained in the non-reacted dry analysis element or a dye having an absorption spectrum same as or similar to that of the indicator dye in the measurement wavelength range. Another correction method in consideration of a layer coefficient of a dry analysis element is also provided.
Abstract:
A method for graphically forming a difference spectrum from a sample spectrum and a reference spectrum on a computer system includes displaying an initial difference spectrum on the display the initial difference spectrum being equal to the sample spectrum, selecting a data point in the initial difference spectrum, having an associated wave number, with a relative pointing device on the display, moving the data point a measurable amount on the display with the relative pointing device, determining a scaling factor in response to the measurable amount and to a data point in the reference spectrum having the same associated wave number, scaling each data point in the reference spectrum by the scaling factor to form a scaled reference spectrum, determining the difference spectrum between the sample spectrum and the scaled reference spectrum, and displaying at least a portion of the difference spectrum on the display.
Abstract:
A method for analyzing the structures of chemical organic compounds, polymers, polynucleotides and peptides is disclosed. The method uses the integrated intensity of spectral light absorption in wide or narrow regions of the ultraviolet and/or visible spectrum and relates these parameters additively to the structural characteristics of the analyzed chemical compound. For the analysis of polymers, nucleotides and/or peptides the integrated intensities of spectral absorption are used sequentially in narrow regions of the ultraviolet light which enables the determination of the molecular weight and the complete amino acid composition of the analyzed compound. All these procedures are interconnected in an automatic spectrophotometric structural analyzer.
Abstract:
A method and apparatus for monitoring the condition of an electrical generator formed of a stator core punching assembly having a plurality of winding slots for receiving a plurality of generator windings. The plurality of winding core slots lie along an interior cylindrical surface of the stator core punching assembly, and the stator core punching assembly has an outer cylindrical surface opposite the interior cylindrical surface. The stator core punching assembly also has a plurality of internal vent openings extending from the outer cylindrical surface toward the inner cylindrical surface. A first optical probe is disposed outside of the stator core punching assembly and is formed of a plurality of optical acquisition devices each of which is formed from at least one optical fiber strand. Each of the optical acquisition devices is disposed to acquire light generated at one of the winding slots and passing through one of the internal vent openings.
Abstract:
Apparatus for analyzing a spectral signature, including: a light source; a spatial light modulator connected to the light source, the spatial light modulator modulating light from the light source in accordance with spatial features of the spectral signature; an optic system upon which modulated light from the spatial light modulator is incident, the optic system filtering the modulated light; a hologram illuminated with filtered, modulated light from the optic system, the hologram outputting an optical identification of the spectral signature; and a detector upon which the optical identification is incident, the detector detecting the optical identification.
Abstract:
An electro-optical detection system for detecting objects 12 embedded within a partially transmitting medium comprises means 20 to receive electro-magnetic radiation in two close spectral channels 28, 212: a signal channel 212 where the wavelength and bandwidth of the signal channel are optimized to correspond to the peak of transmission of the medium and a reference channel 28 where the wavelength and bandwidth are selected to correspond to a spectral region where attenuation in the medium is high. The signal and reference channels are then subtracted (213) so as to remove the effect of reflected radiation from the signal channel 212. The signal is processed digitally (218) to provide an enhanced image of the field of view. In a particular arrangement for detecting objects underwater a CCD TV camera 20 is used with three separate CCD detector arrays providing concurrent red (R), green (G), blue (B) output signals. The green and blue signals are combined in an adjustable ratio to provide the image signal to match the prevailing conditions of the partially transmitting sea. A notch filter is employed to cut out light in a spectral band between the signal and reference channels.
Abstract:
A sensor, particularly a resonant optical biosensor based on the principle of frustrated total reflection, includes an optical structure comprising: a) a cavity layer (3) of transparent dielectric material of refractive index n.sub.3, b) a dielectric substrate (1) of refractive index n.sub.1, and c) interposed between the cavity layer (3) and the substrate (1), a dielectric spacer layer (2) of refractive index n.sub.2. The arrangement is such that the optical structure may be illuminated by a beam of incident radiation, internal reflection occurring at the interface between the substrate (1) and the spacer layer (2). The device is characterised in that the cavity layer (3) or the spacer layer (2) absorbs at the wavelength of the incident radiation. The cavity layer (3) or the spacer layer (2) comprises a material which is either absorbing or is doped with an absorbing species, most preferably a fluorophore.
Abstract:
A method and apparatus for performing dark signal correction on a photoelectric conversion device. A flow of light to the device is alternately conducted and interrupted. The device generates an intermixed signal while the flow of light is conducted to the device, the intermixed signal including a desired signal intermixed with an unwanted dark signal. The device generates a dark signal alone while the flow of light to the device is interrupted. The dark signal alone is filtered to produce a filtered dark signal. The filtered dark signal is subtracted from the intermixed signal to produce a corrected signal, which is representative of the desired signal.
Abstract:
For a given set of dyes, chosen to match a target (standard) color, by combining the a priori percent reflectance and concentration data of primary (calibration) dyeings with that of one or more trial dyeings, a calculated formulation can be obtained which agrees with one of the trial formulations used, or the average, as precisely as desired. A match, color or spectral, to a target color, near to the color of the trial dyeing in color space, is obtained that is, for all practical purposes, as accurate as those dyes permit.