US4330207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescence spectrophotometer
Assignee: Hitachi Ltd
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Filing: 1979-06-05
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Granted: 1982-05-18
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Expires: 1999-06-05
Abstract
Abstract A fluorescence spectrophotometer comprising a light source, an excitation side monochromator which makes light from the light source be subjected to spectroscopic analysis for illuminating as actinic light a sample, a fluoroscence side monochromator which makes fluorescence light from the sample be subjected to spectroscopic analysis, a detector which detects light from the fluorescence side monochromator, and a scanning means which adjusts both the monochromators to the wavelengths of the actinic light and the fluorescence light to be scanned. These monochromators are arranged in such a way that one of them is automatically set to the location of the peak wavelength value which is detected by itself through a simple and automatic wavelength scanning operation and then the other is wavelength-scanned for excitation spectrum or fluorescence spectrum measurement.
Inventors
- 👤 Taro Nogami
- 👤 Hiroshi Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:05
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/44; G01J3/4406
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
254 words
A fluorescence spectrophotometer comprising a light source, an excitation side monochromator which subjects lights from said light source to spectroscopic analysis for illuminating as actinic light a sample, a fluorescence side monochromator which subjects fluorescence light from said sample to spectroscopic analysis, a detector which detects light from said fluorescence side monochromator, an A-D converter which converts the output from said detector into a digital form, memory means for storing values of the wavelengths, peak value and peak wavelength of the spectrum of said sample, and data processing means responsive to the output of said A-D converter for applying said values to said memory means, including means for comparing the peak value stores in said memory means with the value of the output from said A-D converter as one of said two monochromators is wavelength-scanned and the other is fixed in wavelength and for storing in said memory means as said peak value the larger one of said values, means responsive to detection of the wavelengths of said two monochromators being substantially equal for rejecting the output of said A-D converter as a peak value to be stored in said memory means, means for detecting the peak value for setting the wavelength of said one of said two monochromators to the wavelength corresponding to the peak value, and recorder means which, after said data processing portion has fixed said one of said two monochromators to said peak wavelength, wavelength-scans said other of said two monochromators and records in the thus-obtained spectrum of said sample.
Claim 2
Dependent Claim
254 words
A fluorescence spectrophotometer comprising a light source, an excitation side monochromator which subjects lights from said light source to spectroscopic analysis for illuminating as actinic light a sample, a fluorescence side monochromator which subjects fluorescence light from said sample to spectroscopic analysis, a detector which detects light from said fluorescence side monochromator, an A-D converter which converts the output from said detector into a digital form, memory means for storing values of the wavelengths, peak value and peak wavelength of the spectrum of said sample, and data processing means responsive to the output of said A-D converter for applying said values to said memory means, including means for comparing the peak value stores in said memory means with the value of the output from said A-D converter as one of said two monochromators is wavelength-scanned and the other is fixed in wavelength and for storing in said memory means as said peak value the larger one of said values, means responsive to detection of the wavelengths of said two monochromators being substantially equal for rejecting the output of said A-D converter as a peak value to be stored in said memory means, means for detecting the peak value for setting the wavelength of said one of said two monochromators to the wavelength corresponding to the peak value, and recorder means which, after said data processing portion has fixed said one of said two monochromators to said peak wavelength, wavelength-scans said other of said two monochromators and records in the thus-obtained spectrum of said sample.
Claim 3
Dependent Claim
43 words
A fluorescence spectrophotometer as defined in claim 1, wherein said recorder includes means for recording a spectrum which is adjusted in such a manner that the peak value stored in said first memory means is displayed within a predetermined scale on said recorder.
Claim 4
Dependent Claim
24 words
A fluorescence spectrophotometer as defined in claim 1, wherein said data processing means includes display means for displaying the wavelengths of said two monochromators.
Claim 5
Dependent Claim
55 words
A fluorescence spectrophotometer as defined in claim 3, wherein said processing means further includes means for correcting the data to be recorded in said recorder in such a manner that the maximum peak value of the spectrum to be recorded is displayed within a predetermined scale on said recorder when said recorder records said spectrum.
References Cited (Backward Citations)
US4176957A
Cited
US4198567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |