A new two-mirror focal plane chopper for infrared astronomy.
Abstract
A focal-plane chopper is described which uses two mirrors oscillating in phase to give an action equivalent to a single-mirror chopper undergoing parallel motion. A sinusoidal image displacement is achieved which can be maintained at high frequencies using small power dissipation; the resultant detector microphonics are many times lower than those of a conventional chopper for the same image displacement.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1976
- Bibcode:
- 1976A&A....49..421J
- Keywords:
-
- Astronomical Photometry;
- Focal Plane Devices;
- Infrared Astronomy;
- Infrared Imagery;
- Mirrors;
- Telescopes;
- Electronic Control;
- Energy Dissipation;
- Feedback Control;
- Focusing;
- Optical Reflection;
- Instrumentation and Photography