Active coolers for cooling infrared detector on satellite payloads
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Active Coolers for cooling Infrared Detector on satellite payloads. Presentation By Milind B Naik TIFR, MUMBAI. Stirling Cooler. Types of coolers. Passive Coolers Radiators Stored Cryogens Active Coolers Stirling cycle (this presentation covers this cooler ) Pulse tube

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Active coolers for cooling infrared detector on satellite payloads

Active Coolers for cooling Infrared Detector on satellite payloads

Presentation By

Milind B Naik

TIFR, MUMBAI

Stirling Cooler


Types of coolers
Types of coolers

  • Passive Coolers

    • Radiators

    • Stored Cryogens

  • Active Coolers

    • Stirling cycle (this presentation covers this cooler )

    • Pulse tube

    • Joule-Thompson

    • Brayton

    • Adiabatic Demagnetization

    • 3He coolers

    • Optical cooling

    • Peltier effect coolers


    • Passive Coolers

      • Radiators

        • Radiators are panels radiating heat according to Stefan's Law

        • extremely high reliability

        • low mass and a lifetime limited only by surface contamination and degradation

        • limitations on the heat load and temperature (typically in the milliwatt range at 70K )

        • Multiple stages are often used

      • Stored cryogens.

        • Dewars containing a cryogen such as liquid helium or solid neon

        • excellent temperature stability with no exported vibrations

        • substantially increases the launch mass of the vehicle

        • limit the lifetime of the mission to the amount of cryogen stored


    • Active Coolers

      • Stirling cycle.

        • These coolers are based on causing a working gas to undergo a Stirling cycle which consists of 2 constant volume processes and two isothermal processes.

        • Devices consist of a compressor pump and a displacer unit with a regenerative heat exchanger, known as a `regenerator'.

        • Stirling cycle coolers were the first active cooler to be used successfully in space and have proved to be reliable and efficient.

        • Recent years have seen the development of two-stage devices which extend the lower temperature range from 60-80K to 15-30K.



    Some examples of missions using active coolers
    Some examples of missions using active coolers technology

    • Missions are listed as vehicle/instrument.

    • Design lifetime has been quoted if the instrument is yet to be launched

    • or failed due to another component.

    • Excluding electronics.

    • STS/BETSE was a technology demonstrator.

    • UARS/ISAMS figures per cooler running at 83% stroke.



    Typical cryocooler to be used for satellite payload technology

    MOTOR

    COLD FINGER

    RICOR

    ( ISRAEL)



    Working of stirling cryocooler
    Working of stirling cryocooler technology

    Hot side (with heat sink)

    Cold side (cold finger)

    Hot side

    Cold side (cold finger)



    Test-dewar for cryocooler testing technology

    Cryocooler

    Test-dewar


    Test-dewar for cryocooler testing technology

    Temperature Sensor

    Vacuum


    • Various processes involved for testing Stirling cryocooler technology

      • Design, development of test-dewar with vacuum seal, feedthrough wires, optical window, temperature sensor integration with cold-finger etc.

      • Assembly , evacuation of test-dewarCrcycooler assembly

      • Crycooler Fill and purge with Helium

      • Various leak tests

      • Functional tests

      • Calibrations

      • Others.


    Thanks
    Thanks … technology


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