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

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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


  • Active coolers for cooling infrared detector on satellite payloads

    • 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 for cooling infrared detector on satellite payloads

    • 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.


    Advantages disadvantages of different types of cooler technology

    Advantages/disadvantages of different types of cooler technology


    Some examples of missions using active coolers

    Some examples of missions using active coolers

    • 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.


    Example of missions using active coolers

    example of missions using active coolers


    Active coolers for cooling infrared detector on satellite payloads

    Typical cryocooler to be used for satellite payload

    MOTOR

    COLD FINGER

    RICOR

    ( ISRAEL)


    Active coolers for cooling infrared detector on satellite payloads

    Set of cold-finger available for Cryocooler


    Working of stirling cryocooler

    Working of stirling cryocooler

    Hot side (with heat sink)

    Cold side (cold finger)

    Hot side

    Cold side (cold finger)


    Working of stirling cryocooler1

    Working of stirling cryocooler


    Active coolers for cooling infrared detector on satellite payloads

    Test-dewar for cryocooler testing

    Cryocooler

    Test-dewar


    Active coolers for cooling infrared detector on satellite payloads

    Test-dewar for cryocooler testing

    Temperature Sensor

    Vacuum


    Active coolers for cooling infrared detector on satellite payloads

    • Various processes involved for testing Stirling cryocooler

      • 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 …


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