Method for searching target azimuth angle of optical fiber stress axis

Abstract

The invention discloses a method for searching a target azimuth angle of an optical fiber stress axis, and the method comprises the steps: adjusting the position of an optical fiber on a light-transmitting objective table, and guaranteeing that an optical fiber stress axis detection device can collect a clear image; fitting the cross section of the optical fiber by using visual simulation software, and obtaining the real size of each layer structure of the optical fiber by combining the existing parameters of the optical fiber and the proportional relation of each layer structure of the fitted cross section of the optical fiber; acquiring images of the optical fiber under a plurality of special azimuth angles through the optical fiber stress axis detection device, confirming that the distance between a third boundary and a fourth boundary is the most sensitive variable, and defining the distance as a characteristic stripe width; obtaining the azimuth angle in the current state through the measured width of the characteristic fringes, and comparing the deviation between the measured azimuth angle and the target azimuth angle; and if the deviation is greater than the preset error, the optical fiber stress axis torsion device driving the optical fiber to rotate clockwise or anticlockwise until the azimuth angle of the stress axis is within the preset error. The method can accurately control the azimuth angle of the stress axis of the polarization maintaining optical fiber.

Description

technical field [0001] The invention relates to the field of optical fiber stress axis testing, in particular to a method for finding the target azimuth angle of the optical fiber stress axis. Background technique [0002] Polarization-maintaining fiber can maintain the polarization state of linearly polarized light propagating along the polarization axis, and has applications in various fields of fiber optic sensing. Especially in the application of pressure sensing, the azimuth of the stress axis has a great influence on the performance and sensitivity of the system. When the polarization-maintaining fiber is used in a pressure sensor, in order to ensure the consistency of the pressure response of the fiber at each point, it is necessary to strictly control the azimuth of the stress axis of the polarization-maintaining fiber. Therefore, the precise control of the azimuth angle of the stress axis of polarization-maintaining optical fiber is the key to the application of po...

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