A multilayer band pass infrared thin film optical filter has been designed and manufactured which use lead telluride and zinc sulfide as thin film materials.

采用碲化铅和硫化锌作为镀膜材料，研制了空间红外光学系统使用的红外多层带通滤光片。

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The detected pyroelectric infrared signal passes through an optical filter and is focused by the swinging convex lens and the infrared focus is also swinging slightly.

被检测的热释电红外信号经过滤光镜片和摆动的凸透镜聚焦后，其红外光焦点同样也进行微幅摆动。

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This article mainly introduces the research and preparation of a three-band near infrared optical filter.

着重介绍了近红外三波段光学滤光片的研究与制备。

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