Fiber grating sensor based on composite grating linear array and sensing method
A composite grating and fiber grating technology, which is applied in the phase influence characteristic measurement and other directions, can solve the problem that multiple optical structures cannot be connected in series and multi-point refractive index monitoring, and achieve the effect of avoiding physical structure damage
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[0032] The present invention will be further described below in conjunction with specific examples and drawings.
[0033] The invention provides a fiber grating sensor based on a composite grating linear array, such as figure 1 with figure 2 As shown, the optical fiber is included. This embodiment is a single-mode optical fiber 1. It also includes a composite grating linear array 2. The composite grating linear array 2 includes a tilted grating 3 and a Bragg reflection grating group connected in series on the optical fiber; wherein, the tilted grating 3 It is one group, with an angle of 3º-15º with the cross-section of the fiber; the Bragg reflection grating group is more than two groups of Bragg reflection gratings 4 written along the cross-section of the fiber, and the Bragg reflection wavelength of each group of the Bragg reflection grating 4 is different; the inclined grating package The reflection peak wavelength of the layer mode and the Bragg reflection grating 4 is simult...
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