Bias selecting in TEXES electronics

Details Bias selecting in TEXES electronics Bias selecting in TEXES electronics

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7014e.224k&link_type=abstract

Ground-based and Airborne Instrumentation for Astronomy II. Edited by McLean, Ian S.; Casali, Mark M. Proceedings of the SPI

Astronomy and Astrophysics

Astronomy

Scientific paper

TEXES is a high resolution mid-infrared spectrograph acting as a visiting instrument at the NASA IRTF and Gemini North telescopes. Switching from high (R=100,000) to medium resolution (R=15,000), the noise becomes detector dominated due to charge cascades in the low-background detector. This is remedied by lowering the bias voltage across the detector, a problem during observing runs as it requires manual adjustment within the electronics. To save telescope time, a bias selector has been created to allow the bias voltage to be switched from the control room between four options. The options were chosen based upon signal to noise vs. bias voltage testing.

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