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Identical broadband chirped grating interrogation technique for temperature and strain sensing

Identical broadband chirped grating interrogation technique for temperature and strain sensing

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The authors propose a simple, low-cost technique for the interrogation of fibre Bragg grating (FBG) sensors. The induced mismatch between two identical broadband fibre chirped gratings is used to provide a mechanism for measuring changes in strain/temperature associated with one grating. A linear relationship with detected optical power is seen, with a 10 nm chirp rate facilitating sensing ranges up to 9000 µɛ and 750°C for strain and temperature change, respectively.

Inspec keywords: temperature sensors; strain sensors; fibre optic sensors; diffraction gratings; optical modulation; chirp modulation

Other keywords: broadband chirped grating interrogation technique; detected optical power; fibre Bragg grating sensors; temperature sensing; induced mismatch; sensing ranges; strain sensing; chirp rate; 750 degC; linear relationship

Subjects: Measurement of mechanical variables; Fibre optics; Fibre optic sensors; fibre gyros; Mechanical variables measurement; Fibre optic sensors; Thermal variables measurement

References

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