Optical bi-stable shutter development/improvement

J. L. Lizon; N. Haddad; R. Castillo

doi:10.1117/12.924646

24 September 2012 Optical bi-stable shutter development/improvement

J. L. Lizon, N. Haddad, R. Castillo

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84463E (2012) https://doi.org/10.1117/12.924646
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Two of the VLT instruments (Giraffe and VIMOS) are using the large magnetic E/150 from Prontor (with an aperture diameter of 150 mm). As we were facing an unacceptable number of failures with this component some improvement plan was discussed already in 2004. The final decision for starting this program was conditioned by the decision from the constructor to stop the production. The opportunity was taken to improve the design building a fully bi-stable mechanism in order to reduce the thermal dissipation. The project was developed in collaboration between the two main ESO sites doing the best use of the manpower and of the technical capability available at the two centers. The project took advantage of the laser Mask Manufacturing Unit and the invar sheets used to prepare the VIMOS MOS mask to fabricate the shutter petals. Our paper describes the development including the intensive and long optimization period. To conclude this optimization we proceed with a long life test on two units. These units have demonstrate a very high level of reliability (up to 100 000 cycles without failure which can be estimated to an equivalent 6 years of operation of the instrument) A new bi-stable shutter driver and controller have also been developed. Some of the highlights of this unit are the fully configurable coil driving parameters, usage of braking strategy to dump mechanical vibration and reduce mechanical wearing, configurable usage of OPEN and CLOSE sensors, non volatile storage of parameters, user friendly front panel interface.

Citation Download Citation

J. L. Lizon, N. Haddad, and R. Castillo "Optical bi-stable shutter development/improvement", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463E (24 September 2012); https://doi.org/10.1117/12.924646

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KEYWORDS

Camera shutters

Actuators

Reliability

Manufacturing

Capacitors

Connectors

LCDs

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