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Multimode fiber optic Bragg grating sensors for strain and temperature measurements using correlation signal processing methods have been developed. Two multimode Bragg grating sensors were fabricated in 62/125 m graded-index silica multimode fiber; the first sensor was produced by the holographic method and the second sensor by the phase mask technique. The sensors have signal reflectivity of approximately 35% at peak wavelengths of 835 nm and 859 nm, respectively. Strain testing of both sensors has been done from 0 to 1000 and the temperature testing from 40 to 80 C. Strain and temperature sensitivity values are 0.55 pm and 6 pm C, respectively. The sensors are being applied in a power-by-light hydraulic valve monitoring system.

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