CA2184313A1 - Diffused light reflectance readhead - Google Patents

Diffused light reflectance readhead

Info

Publication number
CA2184313A1
CA2184313A1 CA2184313A CA2184313A CA2184313A1 CA 2184313 A1 CA2184313 A1 CA 2184313A1 CA 2184313 A CA2184313 A CA 2184313A CA 2184313 A CA2184313 A CA 2184313A CA 2184313 A1 CA2184313 A1 CA 2184313A1
Authority
CA
Canada
Prior art keywords
degrees
sensor
beam axis
readhead
alpha
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2184313A
Other languages
French (fr)
Other versions
CA2184313C (en
Inventor
Andrew Dosmann
Mohammad A. Kheiri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer Corp
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2184313A1 publication Critical patent/CA2184313A1/en
Application granted granted Critical
Publication of CA2184313C publication Critical patent/CA2184313C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres

Abstract

A diffused light reflectance readhead is disclosed. The readhead employs an improved light emitting diode (LED) providing a more strongly collimated beam of light around a beam axis onto a reagent test pad. The reagent test pad is supported on a strip guide at an angle .alpha. of 5 degrees with respect to the perpendicular of the beam axis. It has been discovered that when .alpha. is between 3 and 8 degrees that specular reflection is dramatically reduced in relation to the small reduction in reflected light received by a sensor. The diffuse reflected light travels to the sensor by passing through a staircase optical baffle at an angle of 45 degrees to the perpendicular of the beam axis. The sensor converts the optical signal into an electrical one for processing and analysis. One embodiment of the present invention can detect the presence of glucose in a blood sample.
CA002184313A 1995-09-05 1996-08-28 Diffused light reflectance readhead Expired - Fee Related CA2184313C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/523,271 US5518689A (en) 1995-09-05 1995-09-05 Diffused light reflectance readhead
US523,271 1995-09-05

Publications (2)

Publication Number Publication Date
CA2184313A1 true CA2184313A1 (en) 1997-03-06
CA2184313C CA2184313C (en) 1999-10-19

Family

ID=24084327

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002184313A Expired - Fee Related CA2184313C (en) 1995-09-05 1996-08-28 Diffused light reflectance readhead

Country Status (5)

Country Link
US (1) US5518689A (en)
EP (1) EP0762111A1 (en)
JP (1) JPH09145614A (en)
AU (1) AU678951B2 (en)
CA (1) CA2184313C (en)

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Also Published As

Publication number Publication date
CA2184313C (en) 1999-10-19
US5518689A (en) 1996-05-21
AU6068496A (en) 1997-03-13
AU678951B2 (en) 1997-06-12
JPH09145614A (en) 1997-06-06
EP0762111A1 (en) 1997-03-12

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Effective date: 20040830