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US4877583A Expired / Lapsed US ⏱️ 0.0 years remaining

Fluorescent analyzer

Assignee: Ajinomoto Co Inc
•
Filing: 1988-03-29
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Granted: 1989-10-31
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Expires: 2008-03-29
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Abstract

Abstract A fluorescent analyzer including a light source which irradiates a sample with direct light, a first wave selector for passing a predetermined wavelength of light emitted from the light source, a sample cell for holding the sample which is irradiated by light passed by the first wave selector, a second wave selector arranged sidewards of the sample outside a direct path of light from the light source passing straight through the sample for passing light of a second predetermined wavelength emitted from the sample upon irradiation by direct light from the light source, a first light detector for producing a first output signal indicative of the amount of light of the second predetermined wavelength passed by the second wave selector, a second light detector for producing a second output signal indicative of the amount of direct light of the first predetermined wavelength passing straight through the sample, a correction circuit for performing a predetermined correction on the amplitude of the first output signal based on the amplitude of the second output signal to produce a corrected measurement signal, and an indicator for indicating the corrected measurement signal.

Inventors

  • 👤 Harufumi Miwa
  • 👤 Minoru Kashiwada
  • 👤 Ikuo Goto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 17:14
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/645; G01N2021/6417; G01N2021/6421

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 230 words
A fluorescent anlyzer comprising: a light source for irradiating a sample with light; a first wave selector for passing a first predetermined wavelength of light emitted from the light source in a path to said sample in a first direction; a sample cell for holding said sample in said light path; a second wave selector arranged in a second direction perpendicular to said first direction passing light of a second predetermined wavelength emitted in said second direction from the sample upon irradiation by light passed by said first wave selector; a first light detector for producing a first output signal indicative of the amount of light of said second predetermined wavelength passed by said second wave selector; a second light detector for producing a second output signal indicative of the amount of light of said first predetermined wavelength passing through the sample in said first direction; a correction circuit for performing a predetermined correction of an amplitude of the first output signal based on an amplitude of the second output signal to produce a correction measurement signal, said correction circuit performing said correction based on the following relationship: Xs'=Xs-[k (Ys-Y.sub.1)], where Xs'=the corrected measurement signal, Xs=the first output signal obtained from the sample, Ys=the second output signal obtained from the sample, Y 1 =a predetermined constant, and k=a predetermined constant; and an indication means for indicating the corrected measurement signal.
Claim 2
Dependent Claim 230 words
A fluorescent anlyzer comprising: a light source for irradiating a sample with light; a first wave selector for passing a first predetermined wavelength of light emitted from the light source in a path to said sample in a first direction; a sample cell for holding said sample in said light path; a second wave selector arranged in a second direction perpendicular to said first direction passing light of a second predetermined wavelength emitted in said second direction from the sample upon irradiation by light passed by said first wave selector; a first light detector for producing a first output signal indicative of the amount of light of said second predetermined wavelength passed by said second wave selector; a second light detector for producing a second output signal indicative of the amount of light of said first predetermined wavelength passing through the sample in said first direction; a correction circuit for performing a predetermined correction of an amplitude of the first output signal based on an amplitude of the second output signal to produce a correction measurement signal, said correction circuit performing said correction based on the following relationship: Xs'=Xs-[k (Ys-Y.sub.1)], where Xs'=the corrected measurement signal, Xs=the first output signal obtained from the sample, Ys=the second output signal obtained from the sample, Y 1 =a predetermined constant, and k=a predetermined constant; and an indication means for indicating the corrected measurement signal.

References Cited (Backward Citations)

US4455376A Cited
US4435507A Cited
US4325706A Cited
US4492752A Cited
US4581334A Cited
US4662742A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-30 1993-05-01 1993-10-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-30 1997-05-01 1997-10-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-30 2001-05-01 2001-10-31 $7700.00 Window Closed / Lapsed

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