High-sensitivity temperature sensor based on hollow-core optical fiber and manufacturing method thereof

Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to a high-sensitivity temperature sensor based on a hollow-core optical fiber and a manufacturing method thereof. The sensor comprises a hollow-core optical fiber and a single-mode optical fiber, the hollow-core optical fiber is filled with liquid with a specific refractive index, and two ends of the hollow-core optical fiber are welded with the single-mode optical fiber; the single-mode fibers at two ends are respectively connected with a light source and a spectrograph; and when incident light of a light source passes through the hollow-core optical fiber, interference occurs, a loss peak is generated at a specific wavelength, when the temperature of the environment where the hollow-core optical fiber is located changes, the effective refractive index of the hollow-core optical fiber changes, drifting of an interference transmission peak is caused, and therefore temperature measurement is achieved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a high-sensitivity temperature sensor based on a hollow-core optical fiber and a manufacturing method thereof. Background technique [0002] Temperature sensors cover a wide range of applications, for example, in biomedicine, industry, power systems, construction, aerospace, and marine development. The working principle of the common thermocouple temperature sensor is based on the thermoelectric effect, that is, the two ends of the conductor with different components are connected into a loop. When one end of the thermocouple is heated, there is a potential difference in the thermocouple circuit, which can be calculated by measuring the potential difference. temperature. In addition, there are thermistor temperature sensors, resistance temperature detectors, etc., and their basic principle is to convert temperature signals into electrical parameter sign...

AI Technical Summary

Problems solved by technology

[0003] These temperature sensors based on electrical processing generally include electrical signal conversion, electrical signal transmission, and processing, so they may be affected by electromagnetic interference in practical applications

Since electronic components have certain requirements for the use environment, such as the need to work within a certain temperature range, temperature sensors based on electrical signals will be subject to certain restrictions in terms of temperature sensing and monitoring in variable and extreme environments

In addition, electronic devices are prone to aging, or are corroded by special liquids, and corresponding packaging processes are required to ensure the service life of the devices

With the development of industrial technology, more and more ambient temperatures need to be measured. Sensors based on electrical signals need to be equipped with large explosion-proof devices when used in flammable and explosive environments, and their applications are greatly restricted.

In addition, due to the small size of the traditional temperature sensor based on electrical signals, the heating of electronic components in the circuit will cause a certain error to the monitored ambient temperature, and it is difficult to obtain an ideal index in terms of sensitivity.

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