Cold focal plane chopper for the PACS instrument of the FIRST satellite: tests of an advanced prototype

Oliver Krause; Dietrich Lemke; Ulrich Groezinger; Armin Boehm; Harald Baumeister; Ralf-Rainer Rohloff

doi:10.1117/12.406561

16 November 2000 Cold focal plane chopper for the PACS instrument of the FIRST satellite: tests of an advanced prototype

Oliver Krause, Dietrich Lemke, Ulrich Groezinger, Armin Boehm, Harald Baumeister, Ralf-Rainer Rohloff

Author Affiliations +

Proceedings Volume 4131, Infrared Spaceborne Remote Sensing VIII; (2000) https://doi.org/10.1117/12.406561
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

Abstract

The imaging photometer and spectroscopic camera PACS, one of the three scientific instruments aboard the European 3.5 m infrared space telescope FIRST, will apply a tilting mirror mechanism for optical beam switching. The development of this focal plane chopper, capable of operation under cryovacuum conditions, is reported here. In order to meet the stringent requirements with respect to power dissipation and positional accuracy, special drive coils and a new position sensor had to be developed. A simulation model including electromagnetic analysis by the 3D code MAFIA, verified by extensive cold testing of the prototype hardware, was used for the optimization of the system and led to the advanced prototype of the chopper. Closed loop control of the mirror deflection allows square wave modulation in the frequency range 0 - 15 Hz (80% duty cycle) with amplitudes of +/- 9 degree(s) with high positional accuracy of less than 30'. The power dissipation at operating temperature of 4 K is below 500 (mu) W.

Citation Download Citation

Oliver Krause, Dietrich Lemke, Ulrich Groezinger, Armin Boehm, Harald Baumeister, and Ralf-Rainer Rohloff "Cold focal plane chopper for the PACS instrument of the FIRST satellite: tests of an advanced prototype", Proc. SPIE 4131, Infrared Spaceborne Remote Sensing VIII, (16 November 2000); https://doi.org/10.1117/12.406561

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available