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Active Coolers for cooling Infrared Detector on satellite payloads

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Presentation on theme: "Active Coolers for cooling Infrared Detector on satellite payloads"— Presentation transcript:

1 Active Coolers for cooling Infrared Detector on satellite payloads
Presentation By Milind B Naik TIFR, MUMBAI Stirling Cooler

2 Types of coolers Passive Coolers Active 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

3 Passive Coolers Radiators Stored cryogens.
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 STEPHANS LAW : AMOUNT FLUX FROM BLACK BODY FLUX : AMOUNT OF ENERGY / SECOND /SQ. CENIMETER ITS MEASURE OF HOW BRIGHT SURFACE APPEARS.

4 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.

5 Advantages/disadvantages of different types of cooler technology

6 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.

7 example of missions using active coolers

8 Typical cryocooler to be used for satellite payload

9 Set of cold-finger available for Cryocooler


11 Working of stirling cryocooler
Hot side (with heat sink) Cold side (cold finger) Hot side Cold side (cold finger)

12 Working of stirling cryocooler

13 Test-dewar for cryocooler testing

14 Test-dewar for cryocooler testing
Temperature Sensor Vacuum

15 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.

16 Thanks …

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