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High temperature sensors (1200º C).

Design and manufacture of optical sensors of high temperature (up to 1200º C)

CALSENS optical sensor of high temperature equals electric thermocouples, with the advantage of the technology of the optic fiber (life expectancy, stability, immunity to electromagnetic interferences, little weight and diameter, possibility of multiplexing of sensors in one cable. The FBG receives a regenerating process (RFBG), patent pending, which allows measurement of temperatures up to 1200 º C The sensor packaging offers stability in harsh environments, and also corrosion and mechanical resistance.


Calibration and behaviour of CALSENS optical sensor for high temperature. Calibration has been done with a Carbolite furnace.

CALSENS offers two types of optical sensors of high temperature. One for temperatures up to 800º C, and another for temperatures up to 1200ºC. The length of the sensor in both designs can vary up to 1 metre. The design of the sensor allows it to be embedded in different materials such as concrete, steel or composite materials (carbon or glass fibers).

Its main features are:

    • Possibility of multiplexation and remote measurements.
    • Long-term high stability and reliability.
    • Immunity to electromagnetic and radio (EMI/RFI) interferences.
    • Compatible with most FBGs’ load-store units.
    • Corrosion resistant.
    • Easy to handle.
temperatura extrema

Signal evolution of CALSENS optical sensor. Extreme reached temperature 1325 ºC.

Technical instructions:

Wavelength range

1510 – 1590 nm

Measurements range

-20ºC to 1200 °C (exceptionally up to 1325 °C)


± 1 ºC


± 0.1 ºC


Changeable length and diameter (14mm standard diameter can be modified on specific user’s requirements)


1 m fiber pigtail (diameter 1 mm or 3mm) (specific user’s requirements can be fulfilled)


FC-PC/APC or SC-PC/APC (contact us for other types)


For measurement ranges up to 1000º C ,a limit of 5 sensors can be multiplexed (a bigger number of sensors can be multiplexed for a lower temperature range)

RFBG lifespan theoretical analysis

Depends on temperature (See graphic)


RFBG lifespan evolution according to temperature.

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