New infrared photometer and f/35 chopping secondary at the 3.6 M telescope

Computer Science – Performance

Scientific paper

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Infrared Detectors, Infrared Telescopes, Mirrors, Photometers, Television Systems, Electric Choppers, Magnetic Control, Performance Tests

Scientific paper

The design and operation of the f/35 chopping secondary mirror and IR detector system installed on the 3.6-m telescope at ESO in November 1984 are reported and illustrated with diagrams and photographs. The 33-cm-diameter chopping mirror is driven by magnetic actuators to provide either square-wave chopping or a linear sky sweep (with rise time 5 ms and end-position stability 0.5 percent of amplitude up to 2 arcmin of sky) and is equipped with an opposition-driven compensator plate to suppress vibrations. The photometer comprises both InSb and bolometer detectors and a TV-camera acquisition and guidance system and offers 1-sigma limiting-magnitude improvements of 0.2-0.8 mag (using a 7.5-arcsec aperture for 30 min) over the previous f/8 system. A similar photometer is being built for use on the 2.2-m telescope.

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