A SURVEY SYSTEM FOR THE MEASUREMENT OF MARINE STRUCTURES

Surveying techniques requiring the use of steel tapes, conventional theodolites, etc., for the measurement of marine structures have disadvantages that can be overcome by the BRITCHECK system, which uses a "total station", a single station combining the functions of a theodolite and an EDM <electromagnetic distance measuring> instrument, to determine the polar co-ordinates of the various target points. The polar co-ordinates are converted to Cartesian co-ordinates by a microprocessor and can be printed out as soon as the target has been surveyed; distances between pairs of target points, and angles between lines defined by pairs of points, can also be printed out on demand. The "total station" consists of an AGA 710 Geodimeter and a 365 SSA <structure survey analyser> dedicated microprocessor; the geodimeter uses a low-power laser as the carrier for up to three modulation frequencies. The article further describes BRITCHECK and mentions some of its applications, which have included lifting the hull lines of a fishing vessel, an RFA tanker in drydock, and a US naval vessel on the building berth, and its extensive use during the construction of a twin-hulled semisubmersible emergency/support vessel. The system was developed by BSRA in conjunction with AGA A/S, of Norway.

• Supplemental Notes:
  • Ship & Boat, 37 <1984>, p. 23 <May> (1 1/2 pp., 2 diag., 1 phot.)
• Publication Date: 1984

Language

• English

Subject/Index Terms

• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00686671
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM