Device and method for distributed detection of straightness of working face of scraper conveyor based on optical fiber sensing

A device for distributed detection of straightness of a working face of a scraper conveyor based on optical fiber sensing, comprising a broadband light source, a first optical fiber circulator array, a second optical fiber circulator array, a collimator array, a reflecting film array, a third optical fiber circulator array, and an optical path analyzer, wherein the first optical fiber circulator array comprises a plurality of first optical fiber circulators which are successively connected in series via a fiber grating, and single-mode optical fibers (SMFs) connected at second ports of the plurality of first optical fiber circulators are etched with Bragg gratings with central wavelengths λ1, λ2, . . . , λn respectively;

• the broadband light source is connected in series to the first optical fiber circulator array via an SMF;
• the second optical fiber circulator array comprises a plurality of second optical fiber circulators, and the collimator array comprises a plurality of collimators arranged at equal intervals;
• the reflecting film array comprises a plurality of reflecting films adhered to the working face of the scraper conveyor in a running direction of the scraper conveyor, and an array interval between the reflecting films is equal to that between the collimators;
• and the third optical fiber circulator array comprises a plurality of third optical fiber circulators successively connected in series via an SMF, and the optical path analyzer is connected in series to the third optical fiber circulator array via an SMF;
• the first optical fiber circulator array, the second optical fiber circulator array, the collimator array, and the third optical fiber circulator array are arranged in a direction parallel to an arrangement direction of the reflecting film array;
• equal numbers of the first optical fiber circulators, the second optical fiber circulators, the collimators, the reflecting films, and the third optical fiber circulators are arranged;
• third ports of the first optical fiber circulators are connected to first ports of the second optical fiber circulators respectively, second ports of the second optical fiber circulators are connected to the collimators respectively, and third ports of the second optical fiber circulators are connected to first ports of the third optical fiber circulators respectively.