THERMO OPTICAL CONTROL OF FOCUS POSITION OF AN ENERGY BEAM IN AN ADDITIVE MANUFACTURING APPARATUS

    公开(公告)号:US20210268741A1

    公开(公告)日:2021-09-02

    申请号:US17255290

    申请日:2019-06-26

    Abstract: A control system for thermo optical control of focus position of an energy beam in an additive manufacturing apparatus has a first doped medium and a second doped medium, each of which is optically transparent and doped with a dopant. The first doped medium has a positive thermo-optical coefficient (dn/dT) and the second doped medium has a negative thermo-optical coefficient (dn/dT) and is in series with the first doped medium. An energy beam input or coupling is configured to generate or receive an energy beam that is required to be controlled, the energy beam being within a first wavelength range and directed towards the first and second doped mediums. An absorbed beam input or coupling is configured to generate or receive at least one absorbed beam in a second wavelength range which is different from the first wavelength range, the absorbed beam being directed towards the first and second doped mediums. The first and second doped mediums have a higher beam absorption characteristic in the second wavelength range than in the first wavelength range, causing the absorbed beam to have a higher absorption than the energy beam in the first and second doped mediums and the first and second doped mediums each have a coating which allows transmission at both the first and the second wavelength ranges.

    MICROWAVE EGG PASTEURIZATION METHOD AND APPARATUS

    公开(公告)号:US20200000128A1

    公开(公告)日:2020-01-02

    申请号:US16488091

    申请日:2018-02-19

    Applicant: CSIR

    Abstract: An in-shell egg pasteurization process includes, in a temperature-raising stage (12), raising the temperature of yolk of a plurality of in-shell eggs (40), simultaneously and at least predominantly by means of microwave radiation, to a pasteurization temperature, the temperature-raising stage (12) including a plurality of elongate or longitudinally extending microwave cavities that are isolated from one another so that microwaves fed into an elongate or longitudinally extending microwave cavity do not leak into any other elongate or longitudinally extending microwave cavity. The in-shell eggs (40) are displaced along the lengths of the elongate or longitudinally extending microwave cavities whilst being irradiated with microwaves. In a pasteurization stage (14), the raised temperatures of the in-shell eggs (40) are maintained for a pasteurization time sufficient to pasteurize the in-shell eggs (40).

    PRODUCTION OF A LAYERED LITHIUM-MANGANESE-NICKEL-COBALT OXIDE MATERIAL

    公开(公告)号:US20190334171A1

    公开(公告)日:2019-10-31

    申请号:US16510527

    申请日:2019-07-12

    Applicant: CSIR

    Abstract: A process for producing a layered lithium-manganese-nickel-cobalt oxide material, includes producing a raw layered lithium-manganese-nickel-cobalt oxide (“LMNC”) material. Optionally, a dopant capable of enhancing the performance of the layered LMNC material when used as a cathode material in an electrochemical cell, is introduced during the production of the raw LMNC material. Before any annealing of the raw LMNC material is effected, it is subjected to microwave treatment. The resultant treated material is annealed to obtain the layered LMNC material.

    Apparatus, methods and systems for measuring and detecting electrical discharge

    公开(公告)号:US09910082B2

    公开(公告)日:2018-03-06

    申请号:US14775479

    申请日:2014-03-13

    Applicant: CSIR

    CPC classification number: G01R31/1218

    Abstract: The invention relates to an apparatus, method and system for measuring and optionally detecting an electrical discharge having a discharge magnitude, wherein the electrical discharge causes a corresponding emission of optical radiation. The apparatus embodies the system and method in accordance with the invention, wherein the method comprises measuring electrical discharge by firstly storing pre-determined calibration data comprising calibrated quantitative measurement values associated with magnitudes of electrical discharge and detector parameters corresponding thereto, the detector parameters being operating parameters associated with the optical detector, receiving and processing a particular detector parameter with the stored calibration data to detect an electrical discharge, and determine a quantitative measurement associated with the magnitude of the detected electrical discharge.

    Method of operating a laser and laser apparatus using intra-cavity digital holograms
    30.
    发明授权
    Method of operating a laser and laser apparatus using intra-cavity digital holograms 有权
    使用腔内数字全息图操作激光和激光设备的方法

    公开(公告)号:US09588488B2

    公开(公告)日:2017-03-07

    申请号:US14173010

    申请日:2014-02-05

    Applicant: CSIR

    Abstract: Laser apparatus includes an output coupler, a gain medium for generating laser light, a rear optical element, and an input coupler. The input coupler is arranged to direct a pump beam to the gain medium and to define an optical path between the output coupler and the rear optical element. The rear optical element is a spatial light modulator arranged to act as an intra-cavity digital holographic mirror which can be digitally addressed. The spatial light modulator displays selectively a gray-scale image of a hologram thereby to phase-modulate laser light in the cavity, thus making it possible to generate an output laser beam having a desired characteristic. The apparatus includes a computer arranged to generate at least one hologram corresponding to a desired output beam characteristic, and a driver circuit responsive to an output from the computer to generate a corresponding gray-scale image of the hologram on the spatial light modulator.

    Abstract translation: 激光装置包括输出耦合器,用于产生激光的增益介质,后部光学元件和输入耦合器。 输入耦合器布置成将泵浦光束引导到增益介质并且在输出耦合器和后部光学元件之间限定光路。 后部光学元件是空间光调制器,其布置成用作可以数字寻址的腔内数字全息镜。 空间光调制器选择性地显示全息图的灰度图像,从而相位调制空腔中的激光,从而可以产生具有期望特性的输出激光束。 该装置包括计算机,其布置成产生对应于期望输出光束特性的至少一个全息图,以及响应于来自计算机的输出的空间光调制器上的全息图的相应灰度图像的驱动器电路。

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