NIRCam pupil imaging lens actuator assembly

Charles S. Clark

doi:10.1117/12.826271

17 September 2009 NIRCam pupil imaging lens actuator assembly

Charles S. Clark

Proceedings Volume 7439, Astronomical and Space Optical Systems; 74391C (2009) https://doi.org/10.1117/12.826271
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The near infrared camera (NIRCam) is one of four science instruments installed on the integrated science instrument module (ISIM) of NASA's James Webb Space Telescope (JWST) which is intended to conduct scientific observations over a five-year mission lifetime. NIRCam's requirements include operation at 37 Kelvin to produce high-resolution images in two-wave bands encompassing the range from 0.6 to 5 microns. The NIRCam instrument is also required to provide a means of imaging the primary mirror for ground testing, instrument commissioning, and diagnostics which have resulted in the development of the pupil imaging lens actuator assembly. This paper discusses the development of the pupil imaging lens (PIL) assembly, including the driving requirements for the PIL assembly, and how the design supports these conditions. Some of the design features included in the PIL assembly are the titanium isothermal optical flexure mounts with multi-axis alignment flexures, a counterbalanced direct drive rotary actuator, and a fail-safe retraction system with magnetic stowage stop. The paper also discusses how the PIL assembly was successfully tested to the demanding requirements typical for cryogenic instruments.

Citation Download Citation

Charles S. Clark "NIRCam pupil imaging lens actuator assembly", Proc. SPIE 7439, Astronomical and Space Optical Systems, 74391C (17 September 2009); https://doi.org/10.1117/12.826271

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