| 摘要 |
The invention relates to a method and a device for continuous surveying of structures, and in particular tunnels. The device comprises a casing 1, one face of which is fitted with two objectives 3, 4, whose optical axes are parallel, and which are fitted with shutters, means 11, 10, 8, 13 for advancing a photographic film 5 in front of the objectives 3, 4, between a supply spool and a take-up spool 7, means for actuating the shutters sequentially, each of them closing only when the other has opened, and means for advancing the film by a predetermined length in front of each objective 3, 4 after it closes. Application to the continous surveying of railway tunnels. <IMAGE>
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