Fourier transform spectrum device

Abstract

Abstract PURPOSE:To eliminate influence by deflection of a mirror, and expand a measuring wavelength area, by providing a pair of rotary phase plates between a fixed mirror and a beam splitter, instead of a moving mirror, and forming an optical path difference. CONSTITUTION:Light to be detected A is reflected by a mirror 16 and a parabolic mirror 17 and becomes parallel light beams, and they are split to a transmission light beam and a reflection light beam by a beam splitter. The transmission light beam passes through phase fixed plates 15a, 15b, is reflected by a fixed mirror and is returned to the beam splitter 10. On the other hand, the reflection light beam passes through rotary position plates 10a, 10b, is reflected by the fixed mirror 12, becomes a luminous flux whose optical path length has been varied, and is returned to the beam splitter 10. Both its luminous fluxes are synthesized and are made incident to a detector 22 through a parabolic mirror 18, a mirror 19, a slit 20 and a lens 21. Since an optical path difference has been formed by using the fixed mirror 12 and a pair of rotary phase plates 14a, 14b instead of a moving mirror, and changing its opening angle (theta), influence by deflection of a mirror is removed and a measuring wavelength area is expanded.

Inventors

• 👤 Masato Mamiya
• 👤 間宮　眞佐人

Bibliographic Details