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    SYSTEMS AND METHODS FOR MODULATING SENSITIVITY OF A PHOTOMETER
    91.
    发明申请
    SYSTEMS AND METHODS FOR MODULATING SENSITIVITY OF A PHOTOMETER 有权

    公开(公告)号：US20220390358A1

    公开(公告)日：2022-12-08

    申请号：US17831458

    申请日：2022-06-03

    Applicant: IDEXX Laboratories Inc.

    Inventor： Garland Christian Misener ,  Bailey R. Auspland

    IPC: G01N21/27 ,  G01N33/72 ,  G01J3/427

    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.

    Dual-comb spectroscopy
    94.
    发明授权
    Dual-comb spectroscopy 有权

    公开(公告)号：US11112310B2

    公开(公告)日：2021-09-07

    申请号：US16555130

    申请日：2019-08-29

    Applicant: Dublin City University

    Inventor： Prince Anandarajah ,  Eamonn Patrick Martin

    IPC: G01J3/453 ,  G01J9/04 ,  G01J3/427 ,  G01J3/42 ,  H01S3/23

    Abstract: A gain switched dual comb spectroscopy device for spectroscopically detecting a sample substance, comprising a first slave laser light source configured to generate a first frequency comb having a first comb free spectral range, and a second slave laser light source configured to generate a second frequency comb having a second comb free spectral range which is different from the first comb free spectral range. A master laser light source is configured to inject seed light in to both slave laser light sources therewith to injection lock the generation of both the first and the second frequency combs. A photodetector part is arranged to combine the first and the second frequency combs and to detect a beat signal the spectrum of which comprises a third frequency comb including beat tones produced by interference between the combined first and second frequency combs.

    FAST COMPUTATIONAL PHASE AND TIMING CORRECTION FOR MULTIHETERODYNE SPECTROSCOPY
    95.
    发明申请
    FAST COMPUTATIONAL PHASE AND TIMING CORRECTION FOR MULTIHETERODYNE SPECTROSCOPY 有权

    公开(公告)号：US20210262857A1

    公开(公告)日：2021-08-26

    申请号：US17240172

    申请日：2021-04-26

    Applicant: The Trustees of Princeton University

    Inventor： Lukasz STERCZEWSKI ,  Jonas WESTBERG ,  Gerard WYSOCKI

    IPC: G01J3/10 ,  G01J3/427

    Abstract: Disclosed herein is an all-digital phase and timing correction procedure for coherent averaging in dual-comb and multiheterodyne spectroscopy—applicable to any dual-comb spectroscopy setup. It can account for large frequency/phase instabilities of the used sources, yielding a significant reduction of the noise pedestal and an increase in signal-to-noise ratio (SNR) of the radio frequency (RF) beat notes. This technique is computationally efficient and can be conveniently implemented either as a post-processing algorithm or in a real-time data acquisition and processing platform without the necessity of adding any additional optical elements to the dual-comb spectroscopy system. By implementing this technique, the performance of any comb- or comb-like-source-based DCS system with a sufficient degree of mutual coherence between the optical modes can be improved in terms of SNR and number of spectroscopically-usable RF beat notes. The described technique is compatible with a DC-centered RF spectrum, where the negative frequencies are folded to the positive domain to double the number of beat notes within the detector bandwidth. The technique enables coherent averaging over extended time-scales even for free-running combs, thus increasing the sensitivity of absorption and dispersion DCS measurements.

    Multiplexing and encoding for reference switching
    96.
    发明授权
    Multiplexing and encoding for reference switching 有权

    公开(公告)号：US11041758B2

    公开(公告)日：2021-06-22

    申请号：US16095323

    申请日：2017-04-13

    Applicant: Apple Inc.

    Inventor： Trent D. Ridder ,  Mark Alan Arbore ,  Gary Shambat ,  Robert Chen ,  David I. Simon ,  Miikka M. Kangas

    IPC: G01J3/427 ,  G01J3/10 ,  G01J3/28 ,  G01J3/42 ,  G01N21/35

    Abstract: Methods and systems for measuring one or more properties of a sample are disclosed. The methods and systems can include multiplexing measurements of signals associated with a plurality of wavelengths without adding any signal independent noise and without increasing the total measurement time. One or more levels of encoding, where, in some examples, a level of encoding can be nested within one or more other levels of encoding. Multiplexing can include wavelength, position, and detector state multiplexing. In some examples, SNR can be enhanced by grouping together one or more signals based on one or more properties including, but not limited to, signal intensity, drift properties, optical power detected, wavelength, location within one or more components, material properties of the light sources, and electrical power. In some examples, the system can be configured for optimizing the conditions of each group individually based on the properties of a given group.

    OPTICAL GAS SENSOR
    98.
    发明申请
    OPTICAL GAS SENSOR 有权

    公开(公告)号：US20210055212A1

    公开(公告)日：2021-02-25

    申请号：US16492802

    申请日：2018-03-07

    Applicant: ELICHENS

    Inventor： Hélène Duprez

    IPC: G01N21/3504 ,  G01N21/31 ,  G01J3/427 ,  G01J3/02

    Abstract: A gas sensor comprises a chamber configured to receive a gas; a light source configured to emit a light wave propagating through the chamber in an emission cone; a measurement photodetector and a reference photodetector, each configured to detect a light wave emitted by the light source and having passed through the chamber. The chamber extends between two transverse walls, arranged opposite one another and connected to one another by a peripheral wall extending therebetween, about a longitudinal axis (Z), and comprising a first reflective segment configured to receive a first portion of the emission cone to reflect it toward the measurement photodetector, thus forming a measurement cone converging toward the measurement photodetector. A second reflective segment of the peripheral wall is configured to receive a second portion of the emission cone to reflect it toward the reference photodetector, thus forming a reference cone converging toward the reference photodetector.

    NDIR glucose detection in liquids
    100.
    发明授权
    NDIR glucose detection in liquids 有权

    公开(公告)号：US10241044B2

    公开(公告)日：2019-03-26

    申请号：US16056531

    申请日：2018-08-07

    Applicant: Airware, Inc.

    Inventor： Jacob Y Wong ,  Thomas Campbell

    IPC: G01N21/59 ,  G01N33/49 ,  G01N21/35 ,  G01N21/27 ,  G01J3/42 ,  G01N21/3577 ,  G01J3/427 ,  G01N21/47 ,  G01N21/31

    Abstract: For determining concentration of targeted molecules MG in a liquid sample admixed with interfering molecules MJ which overlap their absorption band, a special NDIR sampling and calibration technique is employed. Besides the signal source, a reference and one or more interference sources are added. The selection of the wavelength for the interference sources enables its measured transmittance value to be used for deciding the validity of the calibration curve for molecules MG in the liquid sample. This value can further be used to adjust the calibration curve via a parameter linking the transmittances measured at the signal and interference wavelength channels in order to assure its validity.

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