Design and Implementation of Fluorescence Optical Fiber Temperature Measurement System

Optical fiber fluorescence temperature measurement technology combines optical fiber technology with fluorescence sensing technology, and uses optical fiber to transmit light and the temperature sensitivity characteristics of fluorescent substances, so as to realize temperature detection in a variety of occasions and even in harsh environments, with a series of advantages such as strong anti-interference, remote detection and real-time monitoring. Compared with the contact measurement of traditional active temperature measurement equipment, it is more suitable for temperature detection in extreme environments such as strong electromagnetic fields and high-voltage corrosion. In view of a series of shortcomings such as the traditional temperature measurement system being susceptible to external environmental interference, a small and practical fluorescence temperature measurement system was designed in this paper. The whole temperature measurement system is divided into three parts: optical path design, circuit design and program design. The purpose of this paper is to design a high-precision temperature measurement system to solve the problem of difficult temperature measurement in related fields. Experiments are carried out in the temperature range of $-44^{\circ} \mathrm{C} \sim 120^{\circ} \mathrm{C}$, and the measurement accuracy of the designed system is within the range of $\pm 1^{\circ} \mathrm{C}$ and the best temperature measurement accuracy is about $\pm 0.1^{\circ} \mathrm{C}$

I. Introduction

Temperature detection is of great significance, although the traditional temperature measurement system has been developed maturely, it is easily affected by environmental factors, especially under the harsh conditions of high voltage and strong electric field magnetic field, which will cause a series of problems such as reduced temperature detection accuracy and high error [1]. In terms of electrical equipment: since the system was put into operation, the power platform located in the sea area of Wenchang, Hainan Province, has often experienced high unit temperatures, resulting in system outages. However, due to the lack of effective detection methods, maintenance personnel cannot know the specific temperature at which the overtemperature protection is activated, and it is difficult to analyze the specific causes of system shutdown caused by high temperatures, so the new temperature measurement technology is very necessary to realize the real-time monitoring of the radiator temperature of the power unit of the power platform [2]. In addition, it is also very necessary in other fields, such as medical care, military industry and other fields. Conventional temperature sensors (thermocouples) transmit and demodulate measurement data by transmitting electrical signals. In harsh environments, it is susceptible to the electrical and high-frequency signals of other devices, which greatly reduces the accuracy and stability of temperature measurements [3]. The sensor part of the fluorescent fiber temperature measurement system is completely free from electromagnetic interference by transmitting optical signals. Therefore, it can be widely used in harsh environments.