Mechanical slit mask mechanism for the James Webb Space Telescope spectrometer

被引：9

作者：

Henein, S ^{[1
]}

Spanoudakis, P ^{[1
]}

Schwab, P ^{[1
]}

Giriens, L ^{[1
]}

Lisowski, L ^{[1
]}

Onillon, E ^{[1
]}

Myklebust, LI ^{[1
]}

机构：

[1] Ctr Suisse Elect & Microtech SA, CH-2007 Neuchatel, Switzerland

来源：

OPTICAL, INFRARED, AND MILLIMETER SPACE TELESCOPES, PTS 1-3 | 2004年 / 5487卷

关键词：

reconfigurable; slit mask; multi-object; cryogenic; spectrograph; flexures; JWST; NIRSPEC; MOS;

D O I：

10.1117/12.551106

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

A mechanical slit mask mechanism has been designed for the Near Infrared Spectrograph of the James Webb Space Telescope. This mechanism was successfully tested at a cryogenic temperature of 30K, in vacuum. The reconfigurable mask allows to form 24 optical slits in a 137 x 137 mm(2) field of view. The slit length is fixed (4.8 mm) and their width can range from 50 mum to 137 mm. The slit positioning accuracy is +/- 5 mum and the slit width accuracy is +/- 8 mum. The working principle of the mechanism is based on an improved "inch-worm" stepping motion of 48 masking bars forming the optical curtain. Voice coil actuators are used to drive the various clutches and the principal mobile stage. Ratchets which engage in the teeth of a rack machined on the bars allow to cancel the accumulation of motion errors as steps succeed one another. The design makes significant use flexure structures. Cryogenic performance, life and vibration tests have been performed successfully on subassemblies of the mechanism and a full-scale prototype.

引用

页码：765 / 776

页数：12