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    FLUID SENSING SYSTEMS AND METHODS
    1.
    发明申请
    FLUID SENSING SYSTEMS AND METHODS 有权

    公开(公告)号：US20210349068A1

    公开(公告)日：2021-11-11

    申请号：US17274270

    申请日：2019-09-03

    Applicant: Cranfield University

    Inventor： James Andrew Bremner ,  Thomas Kissinger ,  Elizabeth Jane Hodgkinson ,  Ralph Peter Tatam

    IPC: G01N33/00 ,  G01N21/45 ,  G01N21/39 ,  G01D5/353

    Abstract: An interferometric fluid sensing system is provided. The system comprises: a laser; a plurality of first fibre portions arranged to receive laser light from the laser, wherein each of the first fibre portions comprises a void and an opening to allow fluid from the environment around the corresponding first fibre portion to enter the void, wherein the first fibre portions are configured such that the laser light received by each first fibre portion passes through the corresponding void; a second fibre portion configured to provide a reference arm for the interferometric fluid sensing system; and a detector arranged to receive light from the first and second fibre portions, wherein the system is configured such that the laser light that passes through the void of each first fibre portion is caused to interfere with the light passing through the second fibre portion at or before reaching the detector, wherein each of the first fibre portions is arranged such that that light passing through the void of each first fibre portion travels from the laser to the detector over a different path length from the light passing through the voids of the other first fibre portions, wherein the system is configured such that the wavelength of light provided by the laser varies with time according to a modulated function, the modulated function comprising a first function, which varies through a range of wavelengths, modulated by a second, cyclical carrier function. An interferometric fluid detection method is also provided.

    HOLLOW FIBRE WAVEGUIDE GAS CELLS
    2.
    发明申请
    HOLLOW FIBRE WAVEGUIDE GAS CELLS 审中-公开

    公开(公告)号：US20180156715A1

    公开(公告)日：2018-06-07

    申请号：US15572765

    申请日：2016-03-22

    Applicant: Cranfield University

    Inventor： Daniel Francis ,  Elizabeth Jane Hodgkinson ,  Ralph Peter Tatam

    IPC: G01N21/03 ,  G01N21/05 ,  G01N21/85

    CPC classification number: G01N21/0303 ,  G01N21/05 ,  G01N21/31 ,  G01N21/85 ,  G01N2021/8578 ,  G01N2201/08

    Abstract: This disclosure relates to hollow fibre waveguide spectroscopic gas cells built using connectors and the method for making them. The connectors are used to construct gas cell end pieces which allow gas and light to enter the hollow fibre waveguide simultaneously thus creating a gas cell. The connectors comprise a window which intersects or is in close proximity to a junction of bores within the connector, the bores transmitting gas through the connector to or from the hollow fibre waveguide. Connectors may also be used to connect two sections of fibre together in order to produce longer gas cells which enhance the signal-to-noise ratio of spectroscopic measurements. The window, which is at least partially transparent at the wavelength of the light used for spectroscopic purposes, is affixed so as to maintain a gas tight seal for the gas cell. These gas cells provide a combination of long path length and low volume and are well suited to mid-infrared spectroscopic applications which require a fast response time or low flow rate.

    WAVELENGTH CONTROL OF LASER DIODES
    3.
    发明申请
    WAVELENGTH CONTROL OF LASER DIODES 审中-公开
    激光二极管的波长控制

    公开(公告)号：US20170047709A1

    公开(公告)日：2017-02-16

    申请号：US15304153

    申请日：2015-04-09

    Applicant: Cranfield University

    Inventor： Elizabeth Jane Hodgkinson ,  Ralp Peter Tatam ,  c/o Abdullah Shah Asmari

    IPC: H01S5/068 ,  G01N21/27 ,  G01N21/39 ,  H01S5/024 ,  G01N33/00

    CPC classification number: H01S5/06808 ,  G01N21/27 ,  G01N21/39 ,  G01N33/0047 ,  G01N2021/399 ,  G01N2201/062 ,  H01S5/02415 ,  H01S5/06804

    Abstract: This invention generally relates to a method of controlling emission wavelength of a light emitting device, and a system for wavelength control of a light emitting device, for example for wavelength stabilisation of a laser diode. One method of controlling emission wavelength of a light emitting device comprises: determining an indication of series resistance of the device, the series resistance comprising ohmic resistance of the device; providing a current through the device to maintain light emission of the device; measuring a forward voltage of the device during said light emission, the forward voltage being across an impedance comprising impedance of an active region of the device and the series resistance; determining an indicator of active region voltage on the basis of the measured forward voltage and the determined indicator of series resistance; and controlling a temperature of the device on the basis of the determined indicator of active region voltage.

    Abstract translation: 本发明一般涉及一种控制发光器件的发射波长的方法，以及用于发光器件的波长控制的系统，例如用于激光二极管的波长稳定。 控制发光器件的发射波长的一种方法包括：确定器件串联电阻的指示，串联电阻包括器件的欧姆电阻; 提供通过该装置的电流以维持装置的发光; 在所述发光期间测量所述器件的正向电压，所述正向电压跨过包括所述器件的有源区域的阻抗和所述串联电阻的阻抗; 基于所测量的正向电压和确定的串联电阻指示器确定有源区电压的指示; 以及基于所确定的有源区电压的指示器来控制所述装置的温度。

    SAMPLE INSPECTION APPARATUS EMPLOYING A DIFFRACTION DETECTOR
    6.
    发明申请
    SAMPLE INSPECTION APPARATUS EMPLOYING A DIFFRACTION DETECTOR 有权

    公开(公告)号：US20230012499A1

    公开(公告)日：2023-01-19

    申请号：US17945434

    申请日：2022-09-15

    Applicant: THE NOTTINGHAM TRENT UNIVERSITY ,  CRANFIELD UNIVERSITY

    Inventor： Paul EVANS ,  Keith ROGERS

    IPC: G01N23/20008 ,  G01N23/205

    Abstract: A sample inspection apparatus includes a source of electromagnetic radiation, a beam former for producing a plurality of coaxial and substantially conical shells of radiation, a detection surface and a set of conical shell slot collimators. Each conical shell has a different opening angle. The detection surface is arranged to receive diffracted radiation after incidence of one or more of the conical shells upon the sample to be inspected. The set of conical shell slot collimators is provided at or close to the detection surface which each stare at different annular regions of different corresponding conical shells.

    Fibre optic sensing device
    7.
    发明授权
    Fibre optic sensing device 有权

    公开(公告)号：US11162821B2

    公开(公告)日：2021-11-02

    申请号：US16763709

    申请日：2018-11-08

    Applicant: Cranfield University

    Inventor： Thomas Kissinger ,  Ralph Peter Tatam

    IPC: G01D5/353 ,  G01D5/26 ,  G01H9/00

    Abstract: A fibre optic sensing device is provided. The fibre optic sensing device includes a plurality of optical fibre portions, wherein each optical fibre portion is arranged to receive laser light from a common laser and reflect the laser light to a common detector. Each optical fibre portion includes a first reflector spaced from a distal end of the optical fibre portion and a second reflector at the distal end. Each optical fibre portion also includes a sensor provided at the distal end of the optical fibre portion. The sensor includes a third reflector the position of which varies depending on a value of a property being sensed. A distance between the first and second reflectors is different for each of the optical fibre portions.

    AN OPTICAL SHAPE SENSING METHOD AND SYSTEM
    8.
    发明申请
    AN OPTICAL SHAPE SENSING METHOD AND SYSTEM 有权

    公开(公告)号：US20210003392A1

    公开(公告)日：2021-01-07

    申请号：US16977272

    申请日：2019-02-11

    Applicant: Cranfield University

    Inventor： Thomas Kissinger ,  Ralph Peter Tatum

    IPC: G01B11/24

    Abstract: An optical shape sensing method is provided. The method comprises: providing first and second optical fibre portions arranged to receive light from at least one common lasers such that a path length of the light from the laser to the first optical fibre portion differs from a path length of the light from the lasers to the second optical fibre portion by a first distance; wherein the first and second optical fibre portions are spaced apart from each other in a first direction; and wherein the first and second optical fibre portions comprise a plurality of reflectors spaced along the length of the optical fibre portions, wherein the reflectors are arranged in sets of reflectors, each set including one reflector from each of the optical fibre portions, wherein the reflectors in each set are aligned with one another in a second direction that is perpendicular to the first direction when the optical fibre portions are in neutral positions; supplying light from the laser to the optical fibre portions; detecting an interferometric signal from the optical fibre portions at a common detector; determining, for each set of reflectors, optical path length differences between the reflectors in the set of reflectors based on the detected interferometric signal; determining a curvature of the optical fibre portions in the first direction based on the optical path length differences, between the reflectors in the first and second optical fibre portions, for the sets of reflectors. An optical shape sensor and optical shape sensing system are also provided.

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