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    Spectroradiometer for detecting atmospheric contaminants
    81.
    发明授权
    Spectroradiometer for detecting atmospheric contaminants 失效
    用于检测大气污染物的光谱仪

    公开(公告)号：US3563658A

    公开(公告)日：1971-02-16

    申请号：US3563658D

    申请日：1965-10-22

    Applicant: PHILIPS CORP

    Inventor： DREYFUS MARC GEORGE

    IPC: G01J3/427 ,  G01N21/31 ,  G01N33/00 ,  G01J3/42

    CPC classification number: G01N33/0027 ,  G01J3/427 ,  G01N21/314

    Abstract: IN A SPECTROARDIOMETER PARTICULARLY ADAPTED TO DETERMINE THE OCCURRENCE OF ATMOSPHERIC CONTAMINANTS, MEANS ARE PROVIDED TO PRODUCE SIGNALS THAT ARE PORPORTIONAL TO THE SUM AND DIFFERENCE BETWEEN THE DIFFERENCE OF ATMOSPHERIC AND REFERENCE RADIATION INTENSITY AT TWO CLOSELY SPACED WAVELENGTHS. THE SUM AND DIFFERENCE SIGNALS CAN BE DIRECTLY PRODUCED BY PROPER DESIGN OF THE SPECTRO-

    RADIOMETER CHOPPER. WHILE REDUCTION OF THERMAL EFFECTS IS REDUCED BY THIS SYSTEM, STILL FURTHER REDUCTION CAN BE OBTAINED BY EMPLOYING A FILTER HAVING A THERMALLY RESPONSIVE TRANSMITTANCE IN THE SPECTRORADIOMETER.

    IN-SITU INFRA-RED ULTRA-VIOLET PHOTOMETER
    86.
    发明申请
    IN-SITU INFRA-RED ULTRA-VIOLET PHOTOMETER 有权

    公开(公告)号：US20240402014A1

    公开(公告)日：2024-12-05

    申请号：US18804705

    申请日：2024-08-14

    Applicant: PROTEA LTD.

    Inventor： Chris DAW ,  Robin Hutchinson

    IPC: G01J3/427 ,  G01J3/02 ,  G01J3/10 ,  G01J3/12 ,  G01N21/31 ,  G01N21/33 ,  G01N21/3504 ,  G01N33/00

    Abstract: The invention relates to a photometer (30) for analysing the composition of a sample gas. The photometer comprises an infra-red (IR) source (20) configured to direct a first plurality of pulses (40) of IR radiation through the sample gas to an IR detector (26), at least two of the first plurality of pulses being of different wavelength. The photometer further comprises an ultraviolet (UV) source (32) configured to generate a second plurality of pulses (38) of UV radiation for conveyance to a UV detector (36), at least two of the second plurality of pulses being of different wavelength. A path selection arrangement (22, 42-50) is configured to selectively convey different ones of the second plurality of pulses (38) to one of the sample gas and the UV detector (36). The photometer further comprises processing circuitry coupled to the IR source (20), the UV source (32), the IR detector (26), the UV detector (36) and the path selection arrangement (22, 42-50). The processing circuitry is configured to (i) select the wavelength to be used for a given UV pulse of the second plurality of pulses (38), (ii) receive a plurality of detection signals from each of the IR detector (26) and the UV detector (36) and (iii) based on the detection signals, determine a concentration of at least one component of the sample gas. A method for analysing the composition of a sample gas is also disclosed.

    SYSTEMS AND METHODS FOR MODULATING SENSITIVITY OF A PHOTOMETER
    87.
    发明申请
    SYSTEMS AND METHODS FOR MODULATING SENSITIVITY OF A PHOTOMETER 有权

    公开(公告)号：US20240385106A1

    公开(公告)日：2024-11-21

    申请号：US18786662

    申请日：2024-07-29

    Applicant: IDEXX Laboratories Inc.

    Inventor： Garland Christian Misener ,  Bailey R. Auspland

    IPC: G01N21/27 ,  G01J3/02 ,  G01J3/28 ,  G01J3/42 ,  G01J3/427 ,  G01N33/72

    Abstract: A method for calibrating sensitivity of a photometer includes measuring, by a double-beam spectrophotometer, an absorbance spectrum of a control solution, which has been diluted and includes a control substance. The method further includes linearly regressing the absorbance spectrum of the control solution over a predetermined range of wavelengths and determining whether a first slope of the linearly regressed absorbance spectrum of the control solution falls within a range of slopes of lines obtained from linearly regressing absorbance spectra of a plurality of reference solutions over the predetermined range of wavelengths. A concentration of chromophore in each reference solution is known and the absorbance spectra of the plurality of reference solutions have been obtained by the double-beam spectrophotometer.

    Method and system for axially-offset differential interference contrast correlation spectroscopy
    90.
    发明授权
    Method and system for axially-offset differential interference contrast correlation spectroscopy 有权

    公开(公告)号：US11692877B2

    公开(公告)日：2023-07-04

    申请号：US17518761

    申请日：2021-11-04

    Applicant: Purdue Research Foundation

    Inventor： Garth Jason Simpson ,  Chen Li ,  Changqin Ding

    IPC: G01J3/44 ,  G01J3/447 ,  G01J3/02 ,  G01J3/427 ,  G01J3/12

    CPC classification number: G01J3/447 ,  G01J3/021 ,  G01J2003/1291 ,  G01J2003/4275

    Abstract: A method for phase contrasting-correlation spectroscopy: converting an incident linearly polarized light into two polarized components (polarized divergent and convergent components, wherein the polarized divergent component is orthogonal to the polarized convergent component), focusing each of the polarized divergent component and the polarized convergent component into a focal plane, thereby producing two focus planes constituting a reference focus (RF) plane and a sample focus (SF) plane; placing a sample at the SF plane and ambient conditions of the sample at the RF plane, resulting in a phase shift between the two polarized components; reconstituting the two phase-shifted polarized components into a phase-shifted linearly polarized light; detecting the phase-shifted linearly polarized light; calculating phase and intensity of the sample from the phase-shifted linearly polarized light; establishing an autocorrelation of phase and intensity of the phase-shifted linearly polarized light; and generating correlograms of intensity and phase of the phase-shifted linearly polarized light.

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