Thermochromic optical fiber temperature sensor and sensing method thereof

Abstract

A thermochromic optical fiber temperature sensor and a sensing method thereof belong to the field of optical sensors, and the sensor includes: a light source, an incident optical fiber, a thermochromic probe, a heat transfer head, an outgoing optical fiber, a fiber optic spectrometer and a computer, and one end of the heat transfer head is distributed Thermochromic material; the incident optical fiber and the outgoing optical fiber are installed at one end of the thermochromic probe, and the heat transfer head is installed inside the other end of the thermochromic probe; one end of the heat transfer head with the thermochromic material is connected to the The incident light is opposite to the outgoing optical fiber, and one end of the heat transfer head without thermochromic material is connected to the measured object; the light source is connected to the incident optical fiber, and the fiber optic spectrometer and computer are connected to the outgoing optical fiber. The invention can realize accurate temperature monitoring, the method makes the equipment of the optical fiber temperature sensor simple, and the cost is also reduced, and the method and device can also work normally in areas with harsh environmental conditions, such as electric fields, strong corrosive area.

Description

technical field [0001] The invention belongs to the field of optical sensors, in particular to a thermochromic optical fiber temperature sensor and a sensing method thereof. Background technique [0002] The power system is the guarantee for industrial and agricultural production and the development of the national economy. In order to alleviate the power shortage, the power system is developing in the direction of ultra-high voltage, large-capacity AC transmission and high-voltage direct current transmission. Due to the high voltage and high current of various contacts and connection points of electrical equipment in power plants and substations, under heavy loads, the high heat of the contact points may cause equipment burnout and power outages. Therefore, the online monitoring and control of the temperature of various connection points in the high-voltage live transmission network is an important content to ensure the safe operation of the power grid. [0003] For a long...

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Problems solved by technology

[0003] For a long time, it has been difficult to monitor the temperature of the contacts of the switch cabinet in real time. This is because the space of the switch cabinet is limited, but there are many components in the cabinet, and most of the high-voltage live components are exposed, so the conventional temperature measurement method cannot be used.

Ordinary temperature monitoring methods are mainly realized by temperature sensing elements such as thermocouples, thermal resistors, and semiconductor temperature sensors. This method either has metal in the sensor itself, and the function of the sensor fails in a strong magnetic field environment; or requires metal wires to transmit signal, in a compact switchgear, it is very difficult to achieve reliable insulation of the system

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