Device and method for checking quality of fibre-optical

Abstract

The invention relates to a device and method for detecting optical fiber quality. It is made up of optical system forming stripe beam and which including a laser, fiber on the focus plane and the observing screen behind it, CCD camera and a computer with program connected by wires, the optical fiber is placed on the adjusting bracket, the axis is parallel to the cylinder lens, and it maintains or accords the relative optical theory of optical system and laser beam coaxiality. Considering current detection state, the computer also can be connected with a photoelectric alarming device. The optical system is made up of concave lens, convex lens and cylinder lens, and the front focuses of the concave lens and the convex lens are superposed. The device is simple, the sensitivity is high, the precision is high, and the automation degree is high.

Description

technical field [0001] The invention relates to a device and method for detecting the quality of an optical fiber based on light interference, belonging to the field of optical fiber detection. Background technique [0002] At present, optical fiber has been widely used in communication, sensor, medical, military and other fields. With the increasingly widespread application of optical fibers, higher requirements are placed on the quality of optical fibers in some fields (such as military affairs and medical treatment). [0003] An optical fiber generally consists of a core, a cladding, and a protective coating. During the production process, defects such as air bubbles, delamination, necking and cracks are prone to occur. When light is transmitted in the fiber, these defects act as scattering centers and increase the loss of the fiber. The defects existing between the core and the cladding interface in the step-index fiber are particularly harmful. They will cause coupli...

AI Technical Summary

Problems solved by technology

The defects existing between the core and the cladding interface in the step-index fiber are particularly harmful. They will cause coupling attenuation and make the guided mode into a non-guided mode, thereby affecting the quality of light transmission in the fiber. At the same time, the defects of these defects The presence of the fiber will also deteriorate the mechanical strength of the

[0004] The current detection methods include microscope observation method, photoelectric hybrid joint transformation method, back transmission neural network method, online hydrometer, offline optical comparator, online perspective photography method, etc. These methods have their own advantages and disadvantages: Microscopic observation method is easy to operate and accurate High, but it is difficult to withstand the vibration of the optical fiber. In addition, the focal length of the microscope is very short, the field of view is limited, and the measurement speed is very slow. , the detection speed is slow; the neural network method of back transmission is evolved from the photoelectric hybrid joint transformation method, the measuring device is the same as the photoelectric hybrid joint transformation method, and its disadvantages are the same as above; the online hydrometer, the offline optical comparator, and the online perspective camera method It is used to measure or calculate the fiber size

Some defects in optical fibers, such as splits and necks, can be detected by diameter measurement, but other defects, such as air bubbles, cannot be detected by this method

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