| 摘要 |
The invention relates to a filter having spacial selectivity, intended to be interposed between a receiver (11) and an emitter (12) of a system of transmission by infrared radiation, in order to reduce the effect of solar infrared radiation on the said receiver (11), the emitter (12) and the receiver (11) both being placed in a substantially horizontal plane. This filter (10) has a reception lobe whose aperture is limited by means consisting of holes pierced in a vertical plate (1) or by horizontal slits made in the said plate (1). <IMAGE>
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