Weak-grating detection device and detection method thereof
A detection device and a technology of weak gratings, which are applied in the direction of testing optical performance, etc., can solve the problem of inability to accurately measure the reflectivity of large-scale weak fiber gratings online, and achieve the effect of broad application prospects.
Active Publication Date: 2013-12-25
武汉烽理光电技术有限公司
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[0004] The technical problem to be solved by the present invention is to provide a weak grating detection device that realizes online detection and can accurately detect the reflectivity of a single grating and Its detection method
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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0032] The weak grating detection device of the embodiment of the present invention is applicable to the detection of a single grating and a grating array with multiple weak fiber gratings, and can also be used in a large-scale grating array. Such as figure 1Shown is a schematic diagram of a detection device for detecting a large-scale weak grating array. The detection device includes a small broadband light source 1, a modulation module 2, an amplifier 3 (an erbium-doped fiber amplifier can be selected in a preferred embodiment of the present invention), a circulator 4, a sampling module 5 and a ...
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The invention discloses a weak-grating detection device and a detection method thereof, wherein the detection method includes a small bandwidth light source, an er-doped fiber amplifier, a modulation module, a circulator, a sampling module and a spectral analyzer. The small bandwidth light source provides 2-6nm wide-spectrum continuous light power signals. The small bandwidth light source is connected with the modulation module. Light signals output by the modulation module are coupled into an object to be detected through a port of the circulator after being amplified by the er-doped fiber amplifier. The objected to be detected is a single or plurality of fiber gratings with low reflectivity. The other port of the circulator is connected with the sampling module. The sampling module is connected with the spectral analyzer. Through separation and amplification of reflected signals of a single optical grating, the weak-grating detection device comparatively calculates a real reflectivity of the single optical grating and locates a position of the single optical grating accurately.
Description
technical field [0001] The invention relates to the detection of weak gratings, in particular to a weak grating detection device and a detection method thereof. Background technique [0002] The weak fiber grating sensor network has the advantages of strong multiplexing, low crosstalk, and high cost performance, and is expected to be widely used in multi-point monitoring fields such as fire alarms and safety fences. The performance of the weak FBG sensing network directly depends on the fabrication technology of the weak FBG array. At present, the "on-line grating writing" device has been successfully developed, which can automatically write weak grating arrays during the fiber drawing process. This array avoids the contact loss when traditional gratings are welded into an array, has good mechanical properties, and is beneficial to large-scale time-division multiplexing. However, due to the complex manufacturing process, the reflectivity of in-line written gratings will fl...
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IPC IPC(8): G01M11/02
Inventor 文泓桥罗志会郭会勇姜德生
Owner 武汉烽理光电技术有限公司