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
slide3
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
slide4
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
  • 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.
working of stirling cryocooler
Working of stirling cryocooler

Hot side (with heat sink)

Cold side (cold finger)

Hot side

Cold side (cold finger)

slide14
Test-dewar for cryocooler testing

Temperature Sensor

Vacuum

slide15
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.
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