Patent US4286327A successfully refreshed from Google Patents.
US4286327A
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Apparatus for near infrared quantitative analysis
Assignee: Zeltex Inc
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Filing: 1979-09-10
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Granted: 1981-08-25
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Expires: 1999-09-10
Abstract
Abstract An apparatus for near infrared quantitative analysis with an infrared emitting diode (IRED) source utilizes narrow bandpass filters and silicon detectors to provide highly accurate and inexpensive measurement. A narrow bandpass filter in the light path of the IRED passes wavelengths outside the half power bandwidth points of the IRED. A silicon detector together with a sensitive amplifier is used to accurately measure linearly up to six decades of light sensitivity at desired wavelengths.
Inventors
- 👤 Robert D. Rosenthal
- 👤 Scott B. Rosenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255; Y; Y10; Y10S; Y10S250/00; Y10S250/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
An apparatus for near infrared quantitative analysis comprising: a plurality of pulsed infrared emitting diodes (IREDs) of specific one-half power bandwidth; means for providing pulses to control the on off status of the IREDs; a highly sensitive infrared detector positioned to receive infrared energy reflected or transmitted through a sample; a plurality of stationary bandpass filters each selected to allow passage of a preselected wavelength band through it, which selected band is outside the one-half power bandwidth of the IRED, each of the said bandpass filters positioned between each of the said IREDs and the infrared detector; means for preforming the said quantitative analysis based on the energy received by said infrared detector.
Claim 2
Independent Claim
113 words
An apparatus for near infrared quantitative analysis comprising: a plurality of pulsed infrared emitting diodes (IREDs) of specific one-half power bandwidth; means for providing pulses to control the on off status of the IREDs; a highly sensitive infrared detector positioned to receive infrared energy reflected or transmitted through a sample; a plurality of stationary bandpass filters each selected to allow passage of a preselected wavelength band through it, which selected band is outside the one-half power bandwidth of the IRED, each of the said bandpass filters positioned between each of the said IREDs and the infrared detector; means for preforming the said quantitative analysis based on the energy received by said infrared detector.
Claim 3
Dependent Claim
25 words
An apparatus as defined in claim 1, wherein the detector is a silicon detector and further comprising a sensitive amplifier connected to the silicon detector.
Claim 4
Dependent Claim
28 words
An apparatus as defined in claim 1, wherein each of the IREDs are turned on one at a time consecutively and are detected by a single silicon detector.
Claim 5
Dependent Claim
29 words
An apparatus as defined in claim 3, wherein a microprocessor is used to control the IREDs and provide a large number of averaged measurements in less than a second.
Claim 6
Dependent Claim
34 words
An apparatus as defined in claim 4 wherein the microprocessor utilizes the amplified output of the silicon detector to compute with a preselected algorithm and includes means to display the results of the computation.
Claim 7
Dependent Claim
27 words
An apparatus as defined in claim 5 wherein the preselected wavelength bands of the band pass filters include wavelengths of 997, 1007, 1022, 1036.5 and 1057 nm.
Claim 8
Dependent Claim
34 words
An apparatus as claimed in claim 1 further comprising an amplifier connected to a silicon detector feeding a logarithmic amplifier whose output in turn is converted to digital signals used to input a microprocessor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |