| 摘要 |
PROBLEM TO BE SOLVED: To provide a method by which a Cassegrain type electromagnetic wave detection device is miniaturized and optical adjustment is simplified in view of that conventionally the volume of the device is large, an optical system thereof is complicated and thereby the adjustment is difficult when detecting electromagnetic waves having plural wavelengths at a same time. SOLUTION: An infrared ray permeable material is used as a sub mirror, and dichroic coating is provided on a surface of the sub mirror. An infrared ray having a long wavelength is permeated to a main focus side, and an infrared ray having a short wavelength is reflected to a Cassegrain focus side. A sensor is placed on a main focus at a back side of the sub mirror, which is a dead space. Thus, the device is miniaturized, and the optical system or the sensor placed on the Cassegrain focus can be easily adjusted.
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