WO2001073405A1 - Dispositif symetrique d'analyses optique - Google Patents

Dispositif symetrique d'analyses optique Download PDF

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Publication number
WO2001073405A1
WO2001073405A1 PCT/US2001/008848 US0108848W WO0173405A1 WO 2001073405 A1 WO2001073405 A1 WO 2001073405A1 US 0108848 W US0108848 W US 0108848W WO 0173405 A1 WO0173405 A1 WO 0173405A1
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WIPO (PCT)
Prior art keywords
specimen
light
assembly
photodetector
optical
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Application number
PCT/US2001/008848
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English (en)
Inventor
James S. Hutchison
Richard A. Riedel
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Umm Electronics, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Umm Electronics, Inc. filed Critical Umm Electronics, Inc.
Priority to AU2001252933A priority Critical patent/AU2001252933A1/en
Publication of WO2001073405A1 publication Critical patent/WO2001073405A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/8483—Investigating reagent band
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems

Definitions

  • the present invention relates generally to the field of optics, and more specifically to a colorimetric system for analyzing stationary specimens.
  • Colorimitric analysis or colorimetry is the technique by which an unknown color is evaluated in terms of known or standard colors, and has found great use in the fields of analytical chemistry and physics.
  • Devices for performing colorimetric analysis of various test materials are well known in the art.
  • One known method of colorimetric analysis involves shining a beam of light having known intensity and color or peak wavelength on a test specimen, and then transmitting or reflecting the beam to a sensor or photodetector. The degree of absorption of the light beam is then determined and then compared to an internal or external standard. From this measurement and comparison, the color and intensity of the unknown test specimen may be determined.
  • the colorimetric measurement of an unknown is useful for determining, among other things, the concentrations of a known constituent in solution, the rate of an ongoing chemical reaction, and the identity of an unknown constituent.
  • Colorimetric analysis is commonly used as an analytical tool in the fields of physics and chemistry. Colorimetry is useful in investigating physical phenomena such as electrofluorescence and chemical phenomena such as qualitative and quantitative chemical analysis.
  • One useful subgroup of chemical analysis is the medical qualitative and quantitative analysis of biological fluids.
  • Optical chemistry tests may be performed on biological fluid specimens treated with particular reagents. When the specimen and reagent fluids have been introduced into a partially transparent reaction well, a light beam having a known peak wavelength may be shined therein. Photodetectors can measure remission, or diffuse reflectance, from the specimen. The remission data may be used to conduct various optical analyses, including but not limited to analyses directed at lactic acid, ethanol, iron, iron binding capacity, glucose, cholesterol, carbon dioxide, and lipase.
  • Immunoassay and coagulation tests are transmission optical analyses that may be performed on test specimens in containers adapted to pass the colorimetric analysis beam therethrough to a detector. Colorimetric absorption measurements can be made by comparing the spectrums of the light beam before and after it passes through the specimen. Through measurements of light absorption, a technique such as enzyme multiplied immunoassay (EMIT) may be used to optically measure small molecules in solution. EMIT may be used to measure analytes such as digoxin, theophylline, phenytoin, thyroxine, valproic acid, gentamicin, tobramycin, and cyclosporin.
  • EMIT enzyme multiplied immunoassay
  • Turbidity is the measure of the decrease in light passing through a specimen due to scatter, reflectance, and absorption. Turbidity may be used in such techniques as microparticle agglutination inhibition and direct microparticle agglutination to measure such analytes as those listed above regarding EMIT, as well as, but not limited to, human chorionic gonadotropin, troponin, myoglobin, prostate specific antigen, microalbumin and thyroid stimulating hormone.
  • Turbidity may also be used to measure coagulation. Coagulation times measurable by using turbidity in a transmissive optical test configuration include prothrombin time, activated partial thromboplastin time, fibrinogen time, and thrombin time. Coagulation tests are typically performed on stationary specimens.
  • One type of known colorimetric analyzer uses filters in conjunction with a broad-spectrum light source, such as an incandescent or fluorescent bulb, to produce beams of light having the desired color and intensity.
  • a broad-spectrum light source such as an incandescent or fluorescent bulb
  • These colorimeters require light sources capable of generating light intense enough to produce a filtered beam adequate to support colorimetry. Such sources are expensive and tend to run hot and burn out quickly. Furthermore, support assembly for storing and switching multiple filters is cumbersome.
  • colorimetric analyzers use multiple light emitting diodes (LEDs) feeding a common fiber-optic line to produce the colored light beams required to perform colorimetric analysis.
  • LEDs light emitting diodes
  • the optical fibers integral to these systems are prone to breaking and smudging.
  • the presence of optical fibers also introduces extra interfaces that must be maintained.
  • the present invention relates to an analysis method and apparatus for performing optical analyses.
  • One form of the present invention is an optical assembly including a bank of collimated visible- spectrum LEDs shining onto an optical specimen through rectangular slits and also including and an optical detector adapted to detect the light returned by the specimen. The optical specimen is thereby imaged as a series of overlapping rectangles.
  • the optical analysis device is controlled by a microprocessor capable of coordinating the optical analyses of the optical samples, calculating data points, and organizing and storing the data for later retrieval and including a user interface having a display function and a data input function.
  • One form of the present invention contemplates a combination comprising: a light-emitting diode array; a collimator array wherein each collimator includes a slit aligned with a respective one of the light emitting diodes; and a photodetector array positioned to indirectly receive light emitted from the slits, wherein the light emitted from the light emitting diodes is prevented from being directly transmitted to the photodetectors.
  • Another form of the present invention contemplates a combination comprising: a controller adapted to send signals to the light emitting diode array and receive signals from the photodetector array; a specimen adapted to be optically analyzed; a pair of white optical standards adapted to be optically analyzed; and a rastering mirror adapted to direct the light emitted from the slits to the specimen, wherein the mirror is adapted to direct the light back and forth across the specimen; wherein the light exiting the slits has a substantially rectangular cross section; wherein the light is flashed on the specimen as a series of overlapping rectangles; wherein the controller is adapted to average a plurality of received signals into one data point.
  • Still another form of the present invention contemplates a combination, comprising: a light emitting diode array; a collimator array aligned with the light emitting diode array, wherein each collimator opaquely covers a respective one of the diodes except for a transparent slit aligned therewith through which light may escape; a photodetector array positioned to receive light emitted from the diodes, wherein the light emitted from the diodes is prevented by the collimator array from being directly transmitted to the photodetectors; and a controller adapted to control the emission of light from the light emitting diode array and receive signals from the photodetector array generated by light striking the photodetectors.
  • Yet another form of the present invention contemplates a combination, comprising: a bank of discrete light sources ranging in output frequencies from about 400 nm to about 700 nm; a substantially flat test specimen; a plurality of collimators, each collimator aligned with a respective one of the light sources and adapted to pass light to the specimen and having a slit adapted to constrain the light passed therethrough into a beam; and an optical detector adapted to detect light emitted by the light sources and returning from the test specimen.
  • Still another form of the present invention contemplates a method, comprising the steps of: illuminating a first portion of a specimen; receiving a signal corresponding to the intensity of the illumination reflected from the specimen; illuminating a second portion of a specimen; receiving a signal corresponding to the intensity of the illumination reflected from the specimen; and averaging the signals.
  • Yet another form of the present invention contemplates a method, comprising the steps of: sequentially illuminating a plurality of overlapping portions of a specimen; sequentially receiving signals corresponding to the intensity of the illumination reflected from the portions of the specimen; and averaging the signals.
  • Still another form of the present invention contemplates a method, comprising the steps of: providing a plurality of spatially separated white optical standards; sequentially optically sampling each standard; comparing the optical samples; generating an error message if the optical samples are not substantially identical.
  • One object of the present invention is to provide an improved optical analysis device.
  • FIG. 1A is an exploded view of a first embodiment of the present invention.
  • FIG. IB is an exploded view of a second embodiment of the present invention.
  • FIG. 1C is an exploded view of a third embodiment of the present invention.
  • FIG. ID is an exploded view of a fourth embodiment of the present invention.
  • FIG. 2 is an illustrative schematic of remissive optical analysis performed using the embodiment of FIG. 1A.
  • FIG. 3 is an illustrative schematic of transmissive optical analysis performed using the embodiment of claim la.
  • FIG. 4A is an illustrative schematic of remissive optical analysis performed by rastering the beam over a plurality of samples.
  • FIG. 4B is an illustrative schematic of remissive optical analysis performed by rastering the beam over a plurality of samples.
  • FIG. 5A is an illustrative schematic of transmissive optical analysis performed by rastering the beam over a plurality of samples.
  • FIG. 5B is an illustrative schematic of transmissive optical analysis performed by rastering the beam over a plurality of samples.
  • FIG. 6 is an illustrative schematic showing an imaging pattern of overlapping rectangles.
  • FIG. 7 is an illustrative schematic of a test specimen and a first and a second white standard.
  • FIG. 8 is an illustrative schematic of a light beam being directed to the specimens and standards of FIG. 7.
  • One form of the present invention is an optical analysis system having an optical analysis unit.
  • the analysis unit employs an optical read head aligned to analyze a specimen by reading transmitted or remitted light from an array of light emitting diodes (LEDs) adapted to emit a plurality of wavelengths.
  • the optical analysis system analyzes the chemical reaction area or reaction well in a test cartridge by shining a beam of light onto the specimen and measuring the remission, the transmission, or both with an optical detector.
  • the beam of light may be continuously moving during the optical analysis, periodically passing over the specimen.
  • the optical analysis system looks at the specimen area as a series of small overlapping rectangles. Successive overlapping optical samples are taken as the beam passes the specimen and illuminates it as a series of overlapping portions.
  • the specimen is not required to have a uniform shape or color, and several specimens may be simultaneously optically analyzed by careful control of the direction of the beam.
  • FIG. 1A illustrates a first embodiment of the optical analysis assembly 20.
  • the optical analysis assembly 20 includes a light source array 22.
  • the discrete, spatially separated light sources 24 that make up the light source array 22 are light emitting diodes or LEDs in the preferred embodiment. Each LED 24 has a separate predetermined peak emission wavelength. Each LED 24 therefore approximates a monochromatic light source, and can be considered to be substantially monochromatic.
  • a collimator array 26 is aligned with the LED array 22. Each LED 24 shines through a respectively aligned collimator 28.
  • the collimator 28 terminates in a narrow slit 30.
  • the slit 30 is rectangular, although other slit shapes may be used to generate light beams having any desired cross-sectional geometry.
  • the collimator 28 has sufficient length such that the emitted beam is substantially uniaxial with a rectangular cross-section.
  • the optical analysis assembly 20 also includes a light detector array 32.
  • the light detectors 70 making up the light detector array 32 are photodiodes spaced between every other slit 30. Light from the LEDs 24 is prevented from shining directly on the photodiodes 70 by the respectively aligned collimators 28. In other embodiments, the light from the discrete light sources 24 may be prevented from shining directly on the light detectors 70 by any convenient orientation or opaque shield means.
  • the optical analysis assembly 20 of the preferred embodiment includes a bank 22 of seven LEDs 24 emitting radiation throughout the visible spectrum.
  • the shape of the optical analysis assembly 20 in this embodiment is arcuate, although the optical analysis assembly may have any shape convenient to its application.
  • the optical analysis assembly 20 In operation, the optical analysis assembly 20 generates light from an LED 24. The light is channeled by the associated collimator 28 and emerges from the slit 30 as a beam having a substantially rectangular cross-section. The beam is then directed onto a test specimen (not shown) and then returned to a photodetector 70.
  • the optical analysis assembly 20 may be used for optical remission (diffuse reflection) or optical transmission analyses, depending upon the configuration of the test specimen. Transmission optical analysis is schematically represented by FIG.
  • Transmission optical analysis testing begins with a beam of substantially monochromatic light shining from the collimated light source 62.
  • the beam leaving the collimated light source 62 is substantially uniaxial and has a rectangular cross section.
  • the beam is directed by a first mirror 64 through an at least partially transparent specimen 66.
  • the beam may be partially absorbed or scattered by the specimen 66.
  • the beam is then directed by a second mirror 68 to a photodetector 70.
  • Remission optical analysis begins with a beam of substantially monochromatic light shining from the collimated light source 62.
  • the beam leaving the collimated light source 62 is substantially uniaxial and has a rectangular cross section.
  • the beam is directed to an optical specimen 66.
  • the beam is diffusely reflected from the specimen 66 to a photodetector 70.
  • the photodiode light emitter 24 and detector elements 70 of this embodiment can be switched or pulsed at frequencies of about 20 kHz.
  • the LEDs may be continuously illuminated or may be pulsed to emit flashes of light that may be directed to the test specimen as rectangular flashes.
  • An optical test specimen may be sampled as a series of overlapping rectangular sections.
  • the beam may be rastered over the optical specimen, and then returned to the photodetector. If the LEDs 24 are pulsed, the beam returns to the photodetector as a series of pulses and the specimen is imaged as a series of overlapping rectangles 71. (See FIG.
  • the data sampling rate from a single optical test specimen 66 may effectively be several hundred samples per each complete raster sweep of the specimen 66.
  • the beam may be rastered over the test specimen 66 by moving the optical analysis array back and forth over one or more test specimens 66 (using a linear actuator motor or the like) or by introducing a movable mirror 72 into the optical path and using the mirror to direct the beam back and forth over the specimen or over a plurality of specimens.
  • one or more specimens 66 may be passed linearly through the optical beam by means of a conveyor apparatus or the like.
  • the LEDs 24 may be flashed in synchronization with the rastering or specimen 66 motion to produce a controlled and well-defined image of the test specimen 66.
  • a microprocessor may be used to coordinate the rastering of the specimen 66 with the flashing of the LEDs 24 to produce a plurality of overlapping rectangular pulses 71 per raster pass of the light beam over the entire face of the specimen 66.
  • the microprocessor may also be used to receive signals from the photodetectors 70 and average the intensity of the overlapping rectangular signals 71 generated each time the beam is rastered across the face of the test specimen 66 into one representational data point. In this way, a test specimen 66 having an irregular or color- varied surface may be colorimetrically analyzed, and/or a colorimetric analysis may be conducted to measure a change occurring in the specimen 66 over time.
  • FIGs. 4A and B schematically illustrate using a rastered light beam to conduct transmission optical analysis.
  • a light beam travelling from a collimated LED 62 strikes a rastering mirror assembly 72.
  • the rastering mirror assembly 72 reflects the beam through specimen 66, directing the beam back and forth through the specimen 66.
  • the beam is redirected by second mirror 68 to a photodetector 70.
  • the rastering mirror assembly 72 may be controlled by a microprocessor.
  • the microprocessor may be used to coordinate the rastering mirror assembly 72 and receive signals from the photodetector 70.
  • Fig. 4B schematically illustrates using a rastered light beam to conduct transmission optical analyses on a plurality of specimens 66.
  • the light beam from the collimated light LED 62 travels to the rastering mirror 72, where it is sequentially redirected through a plurality of separate specimens 66. After passing through a specimen 66, the beam is then redirected by a second mirror 68 to a photodetector 70.
  • the rastering mirror assembly 72 may be controlled by a microprocessor, which can also receive signals from the photodetector 70.
  • the microprocessor may be used to coordinate the signals from the photodetector 70 with each separate specimen 66.
  • FIGs. 5A and B schematically illustrate using a rastered beam to conduct remissive optical analyses.
  • a beam from a collimated LED 62 is reflected from a rastering mirror assembly 72 to a test specimen 66.
  • the beam is swept back and forth across the test specimen 66.
  • the beam is reflected from the test specimen 66 to a photodetector 70.
  • the LEDs 24 may be flashed at a rate such that the beam illuminates the test specimen 66 as a series of overlapping rectangles 71.
  • a microprocessor may be used to control the rate at which the LEDs 24 are flashed and the beam is swept over the specimen 66.
  • the microprocessor may also be used to receive signals from the photodetector 70 and average the signals from the overlapping rectangles 71 into one data point for each time the beam completes one sweep of the test specimen 66.
  • FIG. 5B schematically illustrates using a rastered beam to conduct remissive optical analyses on a plurality of test specimens 66.
  • the light beam from the collimated LED 62 travels to the rastering mirror 72, where it is sequentially redirected to a plurality of separate specimens 66.
  • the beam is diffusely reflected from a specimen 66 back to a photodetector 70.
  • the rastering mirror assembly 72 may be controlled by a microprocessor, which can also receive signals from the photodetector 70.
  • the microprocessor may be used to coordinate the signals from the photodetector 70 with each separate specimen 66.
  • the present invention also includes a plurality of white optical standards 82, 84 mounted near the optical specimen 66, as illustrated in FIGs. 7 and 8.
  • white optical standards 82, 84 mounted adjacent the test specimen 66, although in other embodiments more white standards 82, 84 may be used.
  • the light beam is directed from the rastering mirror assembly 72 to the first white standard 82, and reflected therefrom to the photodetector array 70.
  • the beam is then directed to the second white standard 84, and again reflected to the photodetector array 70.
  • the electrical output of the photodetector may be compared to both measure the baseline intensity of the incident beam.
  • the integrity of each white standard 82, 84 is also measured by comparison.
  • the comparison check allows an operator to discover if one of the white standards 82, 84 has become damaged or dirty and prevents an erroneous beam intensity calibration form confounding the data, allowing measurements taken at different times and under different conditions to be comparable.
  • the light sources 62, the rastering means, and the light detectors 70 are operationally coupled to a microprocessor.
  • the light sources 62 are actuated by the microprocessor, and can be pulsed.
  • the microprocessor can coordinate the pulsing of the light sources with the speed at which the rastering means sweeps the beam over the specimen 66 in order to control the number and degree of overlap of the overlapping rectangles 71 illuminating the specimen 66.
  • the microprocessor also receives the electronic impulses from the light detectors 70 representing the intensity of the light beam returned from the specimen 66.
  • the microprocessor can average the signals from each raster pass of the beam into a single representative data point.
  • the light sources 62 comprise bank 22 of seven LEDs 24 (See FIG. 1) with peak light emissions at about 425 nm, 505 nm, 570 nm, 590 nm, 615 nm, and 655 nm.
  • the photodetectors 34 are arranged alternately with the LEDs 24.
  • the LED and collimator arrays 22, 26 are mounted under a rotatable turntable (not shown). An array of light detectors 32 is also mounted below the turntable.
  • the collimated light beam generated therefrom is directed to a stationary specimen (not shown), where it can be either transmitted through the specimen and reflected to the light detector array 32 or diffusely reflected from the specimen to the light detector array 32.
  • the beam may be rastered across the specimen as a series of overlapping shapes.
  • a rastering means such as, but not limited to, a movable mirror system may be used to direct the beam back and forth across the face of the specimen.
  • the specimen may be presented in a test cartridge having a semi- transparent reaction well adapted for remission and/or transmission optical analysis.
  • FIG. IB illustrates a second embodiment of the optical analysis assembly 20'.
  • the optical analysis assembly 20' includes a linear light source array 22' defined by a series of discrete, spatially separated light sources 24'.
  • the light sources 24' are light emitting diodes (LEDs). Each LED 24' has a separate predetermined peak emission wavelength. Each LED 24' therefore approximates a monochromatic light source, and can be considered to be substantially monochromatic.
  • a linear collimator array 26' is aligned with the LED array 22'. Each LED 24' shines through a respectively aligned collimator 28'.
  • the collimator 28' terminates in a narrow slit 30'.
  • the slit 30' is rectangular, although other slit shapes may be used to generate light beams having any desired cross-sectional geometry.
  • the collimator 28' has sufficient length such that the emitted beam is substantially uniaxial with a rectangular cross-section.
  • the optical analysis assembly 20' also includes a linear light detector array 32'.
  • the light detectors 70' making up the linear light detector array 32' are photodiodes spaced between every other slit 30'. Light from the LEDs 24' is prevented from shining directly on the photodiodes 70' by the respectively aligned collimators 28'. In other embodiments, the light from the discrete light sources 24' may be prevented from shining directly on the light detectors 70' by any convenient orientation or opaque shield means.
  • the optical analysis assembly 20' of this embodiment includes a bank 22' of seven LEDs 24' emitting radiation throughout the visible spectrum.
  • the shape of the optical analysis assembly 20' in this embodiment is linear, although the optical analysis assembly may have any shape convenient to its application.
  • the optical analysis assembly 20' In operation, the optical analysis assembly 20' generates light from an LED 24'. The light is channeled by the associated collimator 28' and emerges from the slit 30' as a beam having a substantially rectangular cross-section. The beam is then directed onto a test specimen (not shown) and then returned to a photodetector 70'.
  • the optical analysis assembly 20' may be used for optical remission or optical transmission analyses, depending upon the configuration of the test specimen.
  • FIG. 1C illustrates a third embodiment of the optical analysis assembly 20".
  • the optical analysis assembly 20" includes an arcuate light source array 22".
  • each LED 24" that make up the light source array 22" are light emitting diodes or LEDs in the preferred embodiment. Each LED 24" has a separate predetermined peak emission wavelength. Each LED 24" therefore approximates a monochromatic light source, and can be considered to be substantially monochromatic.
  • An arcuate collimator array 26" is aligned with the LED array 22". Each LED 24" shines through a respectively aligned collimator 28".
  • the collimator 28" terminates in a narrow slit 30".
  • the slit 30" is rectangular, although other slit shapes may be used to generate light beams having any desired cross-sectional geometry.
  • the collimator 28" has sufficient length such that the emitted beam is substantially uniaxial with a rectangular cross-section.
  • the optical analysis assembly 20" also includes an arcuate light detector array 32".
  • the light detectors 70" making up the light detector array 32" are photodiodes spaced between every slit 30". Light from the LEDs 24" is prevented from shining directly on the photodiodes 70" by the respectively aligned collimators 28". In other embodiments, the light from the discrete light sources 24" may be prevented from shining directly on the light detectors 70" by any convenient orientation or opaque shield means.
  • the optical analysis assembly 20" of this embodiment includes a bank 22" of seven LEDs 24" emitting radiation throughout the visible spectrum.
  • the shape of the optical analysis assembly 20" in this embodiment is arcuate, although the optical analysis assembly may have any shape convenient to its application.
  • the optical analysis assembly 20" generates light from an LED 24".
  • the light is channeled by the associated collimator 28" and emerges from the slit 30" as a beam having a substantially rectangular cross-section.
  • the beam is then directed onto a test specimen (not shown) and then returned to a photodetector 70".
  • the light beam is sequentially directed toward the two photodetectors 70" immediately adjacent the collimator 28" through which the light beam is directed.
  • the signals from both photodiodes 70" are averaged to correct for any sample tilt relative the optical analysis assembly 20".
  • the preferred angle between the LED 24", the sample, and the photodetector 70" is 45 degrees.
  • the optical analysis assembly 20" may be used for optical remission (diffuse reflection) or optical transmission analyses, depending upon the configuration of the test specimen.
  • FIG. ID illustrates a fourth embodiment of the optical analysis assembly 20'".
  • the optical analysis assembly 20'" includes a linear light source array 22'" defined by a series of discrete, spatially separated light sources 24'".
  • the light sources 24'" are light emitting diodes (LEDs). Each LED 24'" has a separate predetermined peak emission wavelength. Each LED 24'" therefore approximates a monochromatic light source, and can be considered to be substantially monochromatic.
  • a linear collimator array 26'" is aligned with the LED array 22'". Each LED 24'" shines through a respectively aligned collimator 28'".
  • the collimator 28'" terminates in a narrow slit 30'".
  • the slit 30'" is rectangular, although other slit shapes may be used to generate light beams having any desired cross-sectional geometry.
  • the collimator 28'" has sufficient length such that the emitted beam is substantially uniaxial with a rectangular cross-section.
  • the optical analysis assembly 20'" also includes a linear light detector array 32"'. In the preferred embodiment, the light detectors 70'" making up the linear light detector array 32 are photodiodes spaced between every slit 30'".
  • the optical analysis assembly 20'" of the preferred embodiment includes a bank 22'" of seven LEDs 24'" emitting radiation throughout the visible spectrum.
  • the shape of the optical analysis assembly 20 in this embodiment is linear, although the optical analysis assembly may have any shape convenient to its application.
  • the optical analysis assembly 20' In operation, the optical analysis assembly 20'" generates light from an LED 24'".
  • the light is channeled by the associated collimator 28'" and emerges from the slit 30'" as a beam having a substantially rectangular cross-section.
  • the beam is then directed onto a test specimen (not shown) and then returned to a photodetector 70'".
  • the light beam For each test specimen so analyzed, the light beam is sequentially directed toward the two photodetectors 70'" immediately adjacent the collimator 28'" through which the light beam is directed.
  • the signals from both photodiodes 70'" are averaged to correct for any sample tilt relative the optical analysis assembly 20'".
  • the preferred angle between the LED 24'", the sample, and the photodetector 70'" is 45 degrees.
  • the optical analysis assembly 20'" may be used for optical remission (diffuse reflection) or optical transmission analyses, depending upon the configuration of the test specimen.

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Abstract

L'invention concerne un procédé et un appareil permettant d'effectuer des analyses optiques. Selon un mode de réalisation, ledit appareil est constitué d'un ensemble optique (20) comprenant un banc (22) de diodes électroluminescentes (24) collimatées à spectre visible éclairant un spécimen optique à travers des fentes rectangulaires (30), et un détecteur optique (70) conçu de façon à détecter la lumière renvoyée par ledit spécimen. Le spécimen optique reçoit des images sous forme de séries de rectangles de superposition (71). Selon un autre mode de réalisation, le dispositif d'analyse optique (20) est commandé au moyen d'un microprocesseur capable de coordonner les analyses optiques des échantillons optiques, de calculer des points de données, et d'organiser et de stocker lesdites données pour les extraire ultérieurement, et comprenant une interface utilisateur possédant une fonction d'affichage et une fonction d'entrée de données.
PCT/US2001/008848 2000-03-24 2001-03-20 Dispositif symetrique d'analyses optique WO2001073405A1 (fr)

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Cited By (4)

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WO2004109261A1 (fr) * 2003-06-03 2004-12-16 Bayer Healthcare, Llc Correction de longueur d'onde de source lumineuse
WO2005036144A1 (fr) * 2003-10-03 2005-04-21 Bayer Healthcare Llc Correction precise de mesures de facteur de reflexion
EP3058870A1 (fr) * 2015-02-18 2016-08-24 Seiko Epson Corporation Dispositif et procédé d'acquisition d'informations
US10842422B2 (en) 2016-07-21 2020-11-24 University Of Kentucky Research Foundation Compact low-cost fiberless diffuse speckle contrast flow-oximeter

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