Displacement detection system and detection method based on asymmetric interference structure

Abstract

The invention discloses a displacement detection system based on an asymmetric interference structure and a detection method thereof. The system comprises a detection light source, an optical module,a displacement monitoring module and a photoelectric detection module, wherein the optical module comprises a first port, a second port and a third port; the first port is connected with the detectionlight source; the third port is connected with the photoelectric detection module; the displacement monitoring module is fixedly connected with a to-be-detected object; and the displacement monitoring module is of a stepped structure comprising a first reflecting surface and a second reflecting surface. Through the optical module capable of realizing the function of an optical fiber circulator and the displacement monitoring module with a stepped structure, the stepped structure reflecting surface reflects the light to return to the second port and superposes the light with the reflected light of the end surface to form an interference signal, the displacement information of the to-be-detected object is obtained by analyzing the interference signal, displacement measurement in the direction parallel to and perpendicular to the end face of the second port can be achieved, and therefore the application range of the displacement sensor based on the optical structure is widened.

Description

technical field [0001] The invention belongs to the field of displacement sensors, and in particular relates to a displacement detection system based on an asymmetric interference structure and a detection method thereof. Background technique [0002] High-precision, non-contact displacement measurement is widely used in scientific research, industrial production, and aerospace fields. Physical quantities such as acceleration, velocity, vibration, and pressure can be converted into displacement for measurement. At this stage, displacement sensing has developed a variety of detection methods, such as capacitive, magnetoresistive, inductive and optical. Sensors based on optical structures, such as optical fiber sensors, whose signal processing unit is completely separated from passive sensing probes, can greatly reduce the probability of sensor downtime accidents and maintenance costs, and are very suitable for complex and harsh environments. [0003] The extrinsic fiber Fabr...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a displacement detection system based on an asymmetric interference structure and its detection method, aiming to solve the problem that the beat frequency signal can only measure the vertical displacement under certain measurement accuracy in the prior art. The technical problem that the displacement parallel to the direction of the fiber end face cannot be measured due to the displacement in the direction of the fiber end face

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