SOFO sensors

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SOFO sensors

The functional principle of the SOFO system is schematized. The sensor consists of a pair of single -mode fibers installed in the structure to be monitored. One of the fibers, called the measurement fiber, is in mechanical contact with the host structure itself, while the other one, the reference fiber, is placed loose in a neighboring pipe. All deformations of the structure will then result in a change of the length difference between these two fibers.
To make an absolute measurement of this path unbalance, a low-coherence double Michelson interferometer is used. The first interferometer is made of the measurement and reference fibers, while the second is contained in the portable reading unit. This second interferometer can introduce, by means of a scanning mirror, a well-known path unbalance between its two arms and eventually compensate for the length difference between the fibers in the structure. Because of the reduced coherence of the source used, interference fringes are detectable in this case only. If this measurement is repeated at successive times, the evolution of the deformations in the structure can be followed without the need of a continuous monitoring. This means that a single reading unit can be used to monitor several fiber pairs in multiple structures. The precision and stability obtained by this setup have been quantified in laboratory and field tests to 10 ¼ m over more than one year. Even a change in the fiber does not affect the precision, since the displacement information is encoded in the coherence properties of the light and not in its intensity. The reading unit is portable, battery powered and waterproof, making it ideal for dusty and humid environments as the ones found in most building sites. Each measurement takes only a few seconds and all the results are automatically analyzed and stored for further interpretation by the external laptop computer. A more detailed description of this measuring technique can be found in the references. The optical fiber sensor used in this experiment give only one elongation at a time. By introducing partial reflector pairs on both the measurement and the reference fiber it is however possible to obtain the deformation relative to different fiber section separately.

Technical characteristics
AC power supply 230 V 50 Hz / 110 V 60 Hz Auto detect
Internal 12 V DC battery, rechargeable
Autonomy on batteries 5000 measurements ( 20 ° C) , 2500 measurements ( - 10 ° C) in data logger mode *
> 8 hours in interactive mode
External connection RS232 to PC or modem * 12 + 1 optical ports or 24 + 1 * optical ports. Power supply, modem
* power supply, ADAM connection charges *
Typical 20 ' 000 measurements, minimum 8' 000 measurements ( 4MB memory * , up to 80 ' 000 measurements with 16MB flash
* Data logger capacity memory * )
Size ~ 500 mm x 500 mm x 210 mm
Weight ~ 25 kg
Operating temperature 0 ° C to + 60 ° C
- 40 ° C to + 60 ° C with heating option *
Storage temperature - 30 ° C to + 70 ° C
Humidity 90% non-condensed.

For more information and reservations please contact:

Distributor, Agent, Sales, Installation and Training.
Jakarta - Indonesia

Contact Person: Contact Person: Fikri ( 0815 614 1954, 0811 893 101)

Address: Jl. Pahlawan Revolusi No. 22B
Jakarta Timur

Phone. + 62-21-8611 131, 8611 259, 8611 444, 8611449

Fax : + 62-21-8611 207
EMAIL: instrumentasi.sipil@ gmail.com

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