Fiber laser sensor

Details Fiber laser sensor Fiber laser sensor

2005-05-31

2005-05-31

Kang, Juliana K. (Department: 2874)

Optical waveguides

With optical coupler

Input/output coupler

C385S012000

Reexamination Certificate

active

06901187

ABSTRACT:
A fiber laser sensor has a fiber laser (FL) with two reflectors in the form of a first and a second Bragg grating (4, 5) and a fiber segment (3) arranged in between. The first Bragg grating (4) is arranged in a temperature-sensitive fashion. The second Bragg grating is a chirped Bragg grating (5) whose central wavelength is stabilized with regard to temperature changes. By means of this sensor, temperature and pressure can simultaneously be measured separately from one another, beat frequencies of orthogonal polarization eigenmodes of the fiber laser (FL) being a measure of the pressure and beat frequencies of longitudinal modes being a measure of the temperature.

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patent: 19724528 (1998-12-01), None
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Kersey et al, Fiber Grating Sensors, Aug. 1997, Journal of Lightwave Technology, vol. 15, No. 8. pp. 1442-1463.*
M.G. Xu, “Temperature-independent strain sensor using a chirped Bragg grating in a tapered optical fibre”, Electronics Letters, May 11, 1995, vol. 31, No. 10.

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