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This paper describes the solution implemented at SOAR for remotely monitoring and controlling temperatures inside of a spectrograph, in order to prevent a possible damage of the optical parts. The system automatically switches on and off some heat dissipation elements, located near the optics, as the measured temperature reaches a trigger value. This value is set to a temperature at which the instrument is not operational to prevent malfunction and only to protect the optics. The software was developed with LabVIEWTM and based on an object-oriented design that offers flexibility and ease of maintenance.
As result, the system is able to keep the internal temperature of the instrument above a chosen limit, except perhaps during the response time, due to inertia of the temperature. This inertia can be controlled and even avoided by choosing the correct amount of heat dissipation and location of the thermal elements. A log file records the measured temperature values by the system for operation analysis.
Astronomical instruments with hundreds of optical fibers are increasingly common in the setup of the modern telescopes. Multi-fibers connectors assure precise connection among several optical fibers, providing flexibility for instrument exchanges. In fact, highly multiplexed instruments require a fiber connector system that can deliver excellent optical performance and reliability. In this paper, we present a multi-fiber connector developed to assure strong and accurate connection. MULEC is a multi-fibers connector where each fiber end, suitably polished, is coupled at a microlens such that the beam of light from one end of the optical fiber can be collimated and then, focused by another microlens coupled with another optical fiber end. Given the optical magnification inferred by the microlens, the optical accuracy of the coupling is significantly increased.
MULEC is easy to coupling using powerful micro magnets and also, has devices for adjustment in x, y, z and rotation. The optical fiber arrangements on both sides of the connector are constructed with a special dark composite, made with refractory oxide, which is able to sustain its polishing with minimum quantities of abrasives during the polishing process. In other words, when in polishing, the detachment of the refractory oxide nanoparticles reinforces gently the polishing process and increases the efficiency of this procedure.
The bench tests with these connector systems will be implemented in a near future and the chosen fibers should measure the throughput of light and the stability after many connections and disconnections. In this paper, we describe some optical features and mechanical details.
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