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1.发明专利
公开(公告)号：JPH11132941A
公开(公告)日：1999-05-21
申请号：JP22972198
申请日：1998-08-14
Applicant: BIO RAD LABORATORIES
Inventor： BURKA E MICHAEL , CURBELO RAUL
Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and a method, for image-generating attenuation reflection (ATR) spectroscopy, in which the higher speed and the more excellent spatial resolution of the spectroscopy are obtained as compared with a system which acquires data in the same quantity by using a method and an apparatus, for image-nongenerating ATR spectroscopy, in conventional cases. SOLUTION: In an apparatus, a light source 22 is contained, an interferometer 22 which is coupled to a light source generating the spectrum multiple incident beam of light is contained, an internal reflecting element(IRE) 10 containing a contact region 20 which is coupled to a sample 18 being inspected is contained, a focal-plane array detector 32 is contained, a first optical system 26 which is situated so as to be focused toward the contact region 20 via the rear face of the IRE 10 in such a way that the angle of incidence of the incident beam on the front face becomes the critical angle or higher of the IRE 10 is ocontained, and a second optical system 28 which is situated in such a way that reflected light is image-formed on the focal-plane array detector 32 is contained.
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公开(公告)号：JPH10104074A
公开(公告)日：1998-04-24
申请号：JP24868997
申请日：1997-09-12
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: PROBLEM TO BE SOLVED: To provide a measuring method of a spectrum response capable of shortening the period of time required for measurement. SOLUTION: A method is shown for measuring a spectrum response of a sample during test relative to a plurality of modulations including a phase modulation and a sample modulation by means of a step scanning Fourier transform spectrum meter including an interferometer 12, a detector 22, and a digital signal processor(DSP) 36. In one embodiment, this method is employed for obtaining a phase modulation angle and sample modulation angle in use of the DSP 36, obtaining interference images relative to a calibration stationary sample response by the use of the measured phase modulation rotational angle, and obtaining other images corresponding to the calibrated dynamic sample response with the use of both the rotational angles of the measured phase and sample modulation, thereby calculating one or more spectra from interference images that designate the sample calibration response relative to a plurality of modulations.
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公开(公告)号：JPH11125620A
公开(公告)日：1999-05-11
申请号：JP22179298
申请日：1998-08-05
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently and accurately inducing an impulse response of an interesting sample. SOLUTION: At each of a series of steps in a FT-IR spectroscope, an interesting sample is illuminated with an excitation pulse with the radiation of an excitation pulse and an acoustic signal having dependence O2 (t) on time generated from the excitation pulse is captured to calculate a Fourier transform Os of Os (t). At each of the series of steps in the FT-IR spectroscope, a reference sample is illuminated by an excitation pulse of an analysis radiation and an acoustic signal having dependence OR(t) on time generated from the excitation pulse is captured to calculate the Fourier transform OR of OR(t). At each step, an inverse Fourier transform of a ratio of Os /OR is calculated to determine a series of values s(ti ) which are applied for a series of times i. The values s(ti ) thus obtained represent impulse responses s(t) of the interesting sample for a mixture with a light frequency corresponding to given delay values. An interference chart is processed for providing a photoacoustic spectrum.
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公开(公告)号：GB2308889B
公开(公告)日：1999-12-08
申请号：GB9626583
申请日：1996-12-20
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: By considering a transient signal as merely another signal in a linear, shift-invariant system representing a step-scanning Fourier transform spectrometer, the present invention characterizes the transient signal and then compensates for its effect on the measurement by employing various signal processing techniques. Thus, according to one aspect of the present invention, it provides a method for obtaining the spectrum of the desired signal by subtracting the Fourier transform of the transient signal from the Fourier transform of the composite signal output from the detector (i.e., the signal containing both the desired signal and the transient signal). According to another aspect of the present invention, it provides a method for deriving an estimate of the Fourier transform of the transient signal from the Fourier transform of the composite signal.
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公开(公告)号：GB2316766B
公开(公告)日：1999-05-12
申请号：GB9724020
申请日：1996-05-06
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
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Patent Agency Ranking
公开(公告)号：DE19836758A1
公开(公告)日：1999-02-18
申请号：DE19836758
申请日：1998-08-13
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: The spectrometer includes a radiation source (22), a focal plane field detector (32), an internal reflection element (10) with a contact area (20) which engages with a sample (18) to be examined, and a wavelength-selective element, such as an interferometer, which absorbs radiation proceeding between the radiation source and the focal plane field detector, to cause a selective modulation of the absorbed radiation. A device (26) is provided for controlling and concentrating radiation from the source through the rear surface area of the internal reflection element in the direction of the contact area, so that an angle of incidence of an input beam at the front surface area is equal or larger than a critical angle for the internal reflection element. A device (28) is provided for collecting reflected radiation from the contact area and for imaging the reflected radiation on the focal plane field detector.
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公开(公告)号：GB2328018A
公开(公告)日：1999-02-10
申请号：GB9817066
申请日：1998-08-05
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: A technique for extracting the impulse response of a sample of interest includes corresponding measurements made with the sample of interest and a reference sample. At each of a series of steps in an FT-IR spectrometer, the sample of interest is illuminated with an excitation pulse of infrared radiation, acoustic signals having a time dependence os(t) arising from the excitation pulse are captured, and a Fourier transform Os of os(t) is computed. At each of a series of steps in the FT-IR spectrometer, the reference sample is illuminated with an excitation pulse of analytic radiation, acoustic signals having a time dependence OR(t) arising from the excitation pulse are captured, and a Fourier transform OR of OR(t) is computed. For each step, an inverse Fourier transform of the ratio OS/OR is computed to provide a series of values s(ti) for a series of times ti. These values s(ti) represent the impulse response s(t) of the sample of interest for the mix of optical frequencies for that retardation value. Interferograms are processed to provide photoacoustic spectra.
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公开(公告)号：GB2315342A
公开(公告)日：1998-01-28
申请号：GB9725039
申请日：1996-05-28
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL , JOHNSON DAVID B
Abstract: The invention relates generally to interferometers (5), and more specifically to techniques for stabilizing the alignment in a rapid scan Michelson interferometer (5) used in a Fourier transform spectrometer. Alignment circuitry and calibration system (50, 60, 70, 80) is used for a scanning interferometer. Phase shifts (fig. 4b) are introduced into the alignment servo to maximize overall modulation efficiency.
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公开(公告)号：GB2308889A
公开(公告)日：1997-07-09
申请号：GB9626583
申请日：1996-12-20
Applicant: BIO RAD LABORATORIES
Inventor： CURBELO RAUL
Abstract: By considering a transient signal as merely another signal in a linear, shift-invariant system representing a step-scanning Fourier transform spectrometer, the present invention characterizes the transient signal and then compensates for its effect on the measurement by employing various signal processing techniques. Thus, according to one aspect of the present invention, it provides a method for obtaining the spectrum of the desired signal by subtracting the Fourier transform of the transient signal from the Fourier transform of the composite signal output from the detector (i.e., the signal containing both the desired signal and the transient signal). According to another aspect of the present invention, it provides a method for deriving an estimate of the Fourier transform of the transient signal from the Fourier transform of the composite signal.
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