Method for measuring full-link fiber core temperature distribution of high-power fiber laser

Abstract

The invention relates to a method and device for measuring full-link fiber core temperature distribution of a high-power fiber laser, computer equipment and a storage medium. The method comprises the steps that a to-be-measured optical fiber and a detection arm of an OFDR measuring device are welded and placed in a constant-temperature box together, different temperatures are set through the constant-temperature box, the environment temperature is measured after heat balance is achieved every time, and the frequency shift amount of backward Rayleigh scattering in the to-be-measured optical fiber at the corresponding environment temperature is measured through the OFDR measuring device; linear fitting is performed according to the data points of the environment temperature and the corresponding frequency shift amount to obtain an absolute temperature conversion formula and a fiber core temperature coefficient of the to-be-measured optical fiber; initial frequency shift amounts of different positions of the to-be-measured optical fiber before light emission at room temperature are measured; after the to-be-measured optical fiber emits light, multi-point frequency shift amounts of different positions of the to-be-measured optical fiber are measured; and fiber core temperature characteristic distribution is obtained according to the initial frequency shift amount, the multi-point frequency shift amount and the fiber core temperature coefficient.

Description

technical field [0001] The present application relates to the field of optical measurement, and in particular, to a method, device, computer equipment and storage medium for measuring the temperature distribution of a full-link fiber core of a high-power fiber laser. Background technique [0002] Fiber core temperature is a key factor affecting the power improvement of high-power fiber lasers. In the decades of development history of fiber lasers, researchers have used many temperature measurement methods to monitor the operation of fiber lasers and support the study of internal thermal effects. In the field of fiber lasers, traditional measurement methods usually use thermometers, thermocouples or thermal resistances, and infrared cameras to measure temperature. Among them, the traditional thermometer passes the contact heat conduction between the optical fiber to be measured, so that the object in the thermometer is heated and expanded, so as to realize the temperature mea...

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Problems solved by technology

[0004] Since the measurement medium, measurement object, and working environment in the field of optical fiber sensing are different from those in the field of fiber laser, many technical difficulties need to be solved when using OFDR technology to measure the core temperature of high-power fiber laser: 1. In the measurement of fiber laser core temperature During the process, the change of fiber stress will affect the system's measurement of fiber core temperature; 2. The temperature coefficient of different measured fibers is different, and the absolute temperature of the specific fiber cannot be obtained directly; 3. High-power fiber laser core temperature measurement system The signal-to-noise ratio is very low

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