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What kind of temperature sensor can operate in strong electromagnetic fields? Nowadays, there are an increasing number of temperature sensors available, but those that can resist electrical and magnetic influences as well as humidity are quite rare. Yet, in our work and daily life, it is often necessary to measure temperatures under harsh conditions, and that’s when a temperature sensor that meets our needs comes into play – the fiber optic temperature sensor. As the name implies, a temperature sensor is a sensor that can detect the current temperature of the object being measured. The main types of temperature sensors and monitoring methods currently used in China are as follows: 1. Infrared temperature monitoring – Infrared temperature detectors measure the energy of infrared rays generated by heat from live electrical components; they generally do not come into any contact with those components. Since the temperature of the object’s surface is what is being measured, and the surface often has dust or films on it, which reduces the accuracy of the measurements, moreover it can hardly function in environments with strong magnetic fields or high electric fields; as a result, its practical applications in industry are limited. (The image shows a handheld infrared thermometer.) II. The wireless temperature monitoring system mainly consists of three components: wireless temperature sensors, temperature measurement and communication terminals (temperature display devices), and temperature detection and warning workstations. However, this monitoring method has a drawback: if the temperature of the object being monitored is high, it may cause the battery of the wireless temperature sensor to explode, resulting in serious hazards. Therefore, its practical value in industry is extremely limited. (The image shows a surface acoustic wave wireless temperature sensor.) So, is there a temperature sensor that can still function properly in environments with strong electric fields or strong magnetic fields? The answer is certainly yes, and it is the fiber optic temperature sensor that I will be discussing in detail next. A fiber optic temperature sensor is a sensing device that utilizes the principle that the spectrum absorbed by certain materials changes with temperature; by analyzing the spectrum transmitted through the fiber optic cable, it is possible to determine the real-time temperature. Its main components include a fiber optic probe and a photoelectric conversion module, and it comes in distributed and fluorescent fiber optic temperature sensor types. (Fluorescent fiber optic temperature sensor) The SR-G fluorescent fiber optic temperature sensor is a single-point contact type temperature measurement device. Due to its immunity to electromagnetic field interference and its ability to withstand high pressures, it is highly suitable for temperature measurement in environments with high voltages, strong magnetic fields, and flammable or explosive substances. For example: temperature measurement of high-voltage hot spots in electrical equipment such as rail transit dry-type transformers, as well as temperature measurement in special environments like photovoltaic devices and high-voltage contacts in switchgear. The SR-G fluorescent fiber optic temperature sensor is also an independent temperature measurement system. It can be incorporated as a separate sensor component into the fiber optic temperature measurement instruments produced by Huaguang Tianrui Technology, or it can be used as an independent temperature measurement device that can be connected to other instruments or systems, provided that the system offers a DC5V power supply and a USART serial interface. Fiber optic temperature sensors have exceptional resistance to electromagnetic interference; they are highly insulated, flame-resistant, and explosion-proof. Existing temperature sensors are not suitable for use in flammable and explosive environments. In other words, fiber optic temperature sensors can be used in many situations where conventional sensors cannot function, making them highly valuable for industrial applications.