On the Evaluation of Optical Performace of Observing Instruments
Y. Suematsu
It is useful to represent an optical performance of observing
instruments with a single figure such as the Strehl ratio or
rms wavefront error. For this aim, we investigated the relationship
between the Strehl ration and MTF curve; the latter is easily
obtained with MTF chart observation by observing instrument.
Using model instrument whose wavefront aberration is represented
with random combination of low order Zernike polynomials, we
found a definite linear relation between the Strehl ratio and
an average MTF area which is an integration of average MTF curve
with spatial frequency; the linear relation is applicable for the
region where the Strehl ratio is higher than about 0.3. We describe
the method and compare the results with those derived with a
phase diversity method. We expect to apply the method here to evaluate
the optical performance of the filter channels of Focal Plane
Package of SOLAR-B Solar Optical Telescope.
Correspondence
Y. Suematsu (suematsu@solar.mtk.nao.ac.jp), NAOJ
presentation
poster