Double-mesh type infrared band double-band pass optical window electromagnetic shielding structure

Abstract

The invention provides a double-mesh type infrared band double-band pass optical window electromagnetic shielding structure, belonging to the field of anti-electromagnetic interference of multi-mode detection instruments. The structure is formed by taking a substrate, a metal film, small resonance circles and big resonance circles as a periodic unit, wherein the big resonance circles take 60 degrees as a periodic array; and the centers of the small resonance circles are positioned at the geometric center of a regular triangle formed by three adjacent and non-collinear centers of the big resonance circles; and the radiuses of the small resonance circles are less than those of the big resonance circles. The double-mesh type infrared band double-band pass optical window electromagnetic shielding structure has an electromagnetic shielding function for double infrared band-pass filtering and wide frequency bands. Geometric center type infrared band double-band pass optical window electromagnetic shielding structure belongs to the field of the anti-electromagnetic interference of the multi-mode detection instrument, and is formed by taking the substrate, the metal film, the small resonance circles and the big resonance circles as the periodic unit, wherein the small resonance circles and the big resonance circles have different cycles and are not overlapped, and the difference of the inner rings and the outer rings of the big resonance circles is smaller than the diameters of the small resonance circles. The structure can realize the electromagnetic shielding function of double infrared band-pass filtering and wide frequency band.

Description

Technical field [0001] The invention belongs to the technical field of anti-electromagnetic interference of multi-mode detection instruments, and relates to an electromagnetic shielding structure of a dual-mesh infrared waveband dual-bandpass optical window. Background technique [0002] At present, how to effectively shield the external electromagnetic interference during the operation of the optical detector without affecting its normal operation is an important problem. For this problem, the traditional method is to use optical window electromagnetic shielding technology to achieve infrared band pass. The disadvantage of this method is that the photodetector can only emit electromagnetic waves of a specific band for detection, and cannot detect objects shielded by some bands. . The electromagnetic shielding structure of dual-mesh infrared band and dual-band-pass optical window overcomes this drawback to a certain extent, so that the photodetector can emit electromagnetic wave...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the technical deficiency that the electromagnetic shielding structure of the single-bandpass optical window in the infrared band cannot identify invisible units with high absorption rates for specific wavelengths in the detection field, and design a new type of optical window with passbands in two different wavelength ranges. Window electromagnetic shielding structure

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