Infrared narrow-band deep cut-off filter for detecting sevoflurane

The invention belongs to the field of optical filters, and particularly relates to an infrared narrow-band deep cut-off optical filter for detecting sevoflurane, and the structure of a band-pass film system composite short-wave pass cut-off film system is # imgabs0 #; the structure of the long-wave-pass cut-off film system is # imgabs1 #; wherein the # imgabs2 is a germanium substrate; 3 # imgabs3 is air; the # imgabs4 # is made of a high-refractive-index material; the # imgabs5 # is made of a low-refractive-index material; and # imgabs6 # is the number of cycles. The invention has the advantages of high signal-to-noise ratio, high transmission of spectrum index, deep background and wide cut-off during incidence. 本发明属滤光片领域，尤其涉及一种用于探测七氟醚红外窄带深截止滤光片，带通膜系复合短波通截止膜系结构为：#imgabs0#；长波通截止膜系结构为：#imgabs1#；其中：#imgabs2#为锗基底；#imgabs3#为空气；#imgabs4#为高折射率材料；#imgabs5#为低折射率材料；#imgabs6#为循环次数。本发明在入射时具有高信噪比，光谱指标高透射，深背景，宽截止。