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US5021661A
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Time-resolved infrared spectrophotometer
Assignee: Jeol Ltd
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Filing: 1990-09-04
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Granted: 1991-06-04
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Expires: 2010-09-04
Abstract
Abstract A time-resolved infrared spectrophotometer capable of investigating samples exhibiting short periods of response to stimuli. The spectrophotometer comprises a rapid scan interferometer, a stimulus generator periodically producing a stimulus not in synchronism with the reference signal produced by the interferometer, a detector detecting the radiation emerging from the interferometer, a variable delay circuit producing a trigger signal after a delay with respect to the stimulus, a gate circuit converting the output from the detector into a discrete form in response to the trigger signal, a low-pass filter for detecting the envelope of the output from the gate circuit, an analog-to-digital converter converting the output from the filter into digital form, and a CPU which takes the Fourier transform of the output from the converter, for obtaining a spectrum.
Inventors
- 👤 Koji Masutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:55
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/2889; G01J3/45; G01J3/453
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A time-resolved infrared spectrophotometer comprising: a rapid scan interferometer; a stimulating means for periodically giving a stimulus to a sample placed in the optical path inside the interferometer; a delay means producing a trigger signal after a given delay with respect to the application of the stimulus; a detector detecting the radiation emerging from the interferometer; a sampling means which converts the output signal from the detector into a discrete form in response to the trigger signal; a means for detecting the envelope of the output signal from the sampling means; and a Fourier transform means which Fourier-transforms the output signal from the detecting means to obtain a spectrum.
Claim 2
Dependent Claim
109 words
A time-resolved infrared spectrophotometer comprising: a rapid scan interferometer; a stimulating means for periodically giving a stimulus to a sample placed in the optical path inside the interferometer; a delay means producing a trigger signal after a given delay with respect to the application of the stimulus; a detector detecting the radiation emerging from the interferometer; a sampling means which converts the output signal from the detector into a discrete form in response to the trigger signal; a means for detecting the envelope of the output signal from the sampling means; and a Fourier transform means which Fourier-transforms the output signal from the detecting means to obtain a spectrum.
Claim 3
Dependent Claim
17 words
The time-resolved infrared spectrophotometer of claim wherein said means for detecting the envelope is a low-pass filter.
Claim 4
Dependent Claim
18 words
The time-resolved infrared spectrophotometer of claim 1, wherein said means for detecting the envelope is an integrator circuit.
Claim 5
Dependent Claim
48 words
The time-resolved infrared spectrophotometer according to claims 1, 2 or 3, wherein said sampling means and said delay means together form a circuit component set, and wherein at least one similar circuit component set is added such that these circuit component sets are arranged in a side-by-side relation.
Claim 6
Dependent Claim
34 words
The time-resolved infrared spectrophotometer according to claims 1, 2 or 3, wherein said sample is placed as the light source for the rapid scan interferometer and stimulated to emit radiation by the stimulating means.
Claim 7
Dependent Claim
169 words
A time-resolved infrared spectrophotometer comprising: a rapid scan interferometer; a stimulating means for periodically giving a stimulus to a sample placed in the optical path inside the interferometer; a clock signal-generating means producing a first clock signal to be supplied to the stimulating means and a second clock signal having a frequency twice as high as the frequency of the first clock signal; a delay means delaying the second clock signal; a detector detecting the radiation emerging from the interferometer; a sampling means which converts the output signal from the detector into a discrete form in response to the output signal from the delay means; a band-pass filter the center frequency of which is equal to the frequency of the second clock signal and which receives the output signal from the sampling means; a lock-in amplifier synchronized with the second clock signal and receiving the output signal from the band-pass filter; and a Fourier transform means which Fourier-transforms the output signal from the lock-in amplifier to obtain a spectrum.
Claim 8
Dependent Claim
169 words
A time-resolved infrared spectrophotometer comprising: a rapid scan interferometer; a stimulating means for periodically giving a stimulus to a sample placed in the optical path inside the interferometer; a clock signal-generating means producing a first clock signal to be supplied to the stimulating means and a second clock signal having a frequency twice as high as the frequency of the first clock signal; a delay means delaying the second clock signal; a detector detecting the radiation emerging from the interferometer; a sampling means which converts the output signal from the detector into a discrete form in response to the output signal from the delay means; a band-pass filter the center frequency of which is equal to the frequency of the second clock signal and which receives the output signal from the sampling means; a lock-in amplifier synchronized with the second clock signal and receiving the output signal from the band-pass filter; and a Fourier transform means which Fourier-transforms the output signal from the lock-in amplifier to obtain a spectrum.
Claim 9
Dependent Claim
45 words
The time-resolved infrared spectrophotometer according to claim 6, wherein said sampling means and said delay means together form a circuit component set, and wherein at least one similar circuit component set is added such that these circuit component sets are arranged in a side-by-side relation.
Claim 10
Dependent Claim
33 words
The time-resolved infrared spectrophotometer according to claims 6 or 7, wherein said sample is placed as the light source for the rapid scan interferometer and stimulated to emit radiation by the stimulating means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |