Abstract The TRW pulse tube cryocooler for JPL’s Atmospheric Infrared Sounder (AIRS) instrument is required to meet stringent requirements for radiated electric and magnetic fields, conducted emissions on the input power bus, and electromagnetic susceptibility. To meet the radiated magnetic field requirements, special mu-metal shields were designed, fabricated, and fined to the cooler following an extensive period of magnetic testing with mock-up cooler hardware. Excessive magnetic fields is a generic issue with linear-motor cryocoolers, as is excessive levels of input ripple current. Solving the ripple current issue required the addition of a dedicated ripple filter as part of the spacecraft power system. As one of the first cryocoolers with flight electronics available for testing, the AIRS cooler offered an important opportunity to measure and understand these important issues. This paper describes the development of the magnetic shields to bring the AC magnetic fields of the AIRS cooler within the requirements of MIL-STD-461C, includes before and after data on the achieved field levels, and presents extensive data on the suite of EMI characteristics of the AIRS cooler with its flight electronics. Because of its importance, levels of input ripple current are presented as a function of compressor input power to allow future applications to judge the ripple-current compatibility with specific power system capabilities and to serve as data for scoping the design of ripple suppression hardware.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    EMI Performance of the AIRS Cooler and Electronics


    Contributors:

    Published in:

    Publication date :

    2002-01-01


    Size :

    10 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




    EMI Performance of the AIRS Cooler and Electronics

    Johnson, D. L. / Collins, S. A. / Ross, R. G. | British Library Conference Proceedings | 1999


    AIRS PFM Pulse Tube Cooler System-Level Performance

    Ross, R.G. Jr. / Johnson, D.L. / Collins, S.A. et al. | Springer Verlag | 2002


    AIRS PFM Pulse Tube Cooler System-Level Performance

    Ross, R. G. / Johnson, D. L. / Collins, S. A. et al. | British Library Conference Proceedings | 1999



    AIRS Pulse Tube Cooler System-Level and In-Space Performance Comparison

    Ross, R. G. | British Library Conference Proceedings | 2003