A new infrared modulator

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Infrared Astronomy, Modulators, Telescopes, Ceramics, Optical Correction Procedure, Piezoelectricity, Step Functions, Television Systems

Scientific paper

An infrared modulator designed for astronomical work is described in which the telescope pupil is imaged on a concave spherical mirror mounted on four bending-type piezoceramics and the mirror reforms the focal image on the detector with the desired modulation. The present system is an alternative to a wobbling secondary and is subject to resonances resulting from inertia and the mirror mounting. It is shown that the system works most efficiently at the resonance frequency in the case of sinusoidal modulation, but that the possible presence of an odd harmonic of the modulation frequency at the resonance must be taken into account for square-wave modulation. It is noted that a source may be scanned with this modulator by applying a steadily drifting or stepping signal to both pairs of ceramics, and that an image consisting of 25 data points can be obtained with television scanning.

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