Волоконно-оптичні датчики температури Fiber M-INNO

Application of Fiber M Fiber Temperature Sensor for Temperature Monitoring in High Temperature and Harsh Environments

1、 Common models of Fiber M fiber optic temperature sensors

Fiber M fiber temperature sensors may have multiple models to suit different application scenarios. In the current market, some fiber optic temperature sensor models have their own unique performance parameters and applicable ranges. Наприклад, model AF28- OPTIC3000X2 (stock number: M241812）1， It uses multimode optical fiber to provide high voltage isolation, and its casing is made of stainless steel material, which can meet the installation requirements of industrial environments. The interface of this model of sensor is ST fiber optic interface, which is easy to install and has high anti-interference performance. Загалом, it is very suitable for operation in harsh environments. Its temperature measurement range is -55 ℃ -+125 ℃, with a temperature measurement error of less than or equal to 0.5 ℃ in the full range. The temperature measurement resolution is ± 0.1 ℃, the temperature measurement cycle is 45 секунд, the probe temperature range is -100 ℃ -+260 ℃, the fiber length is less than or equal to 50m (multimode fiber), the interface method is ST interface, the battery life is 4.5 років, the operating temperature is -40 ℃ -+80 ℃, and the probe size is 8 (діаметр) мм × 200 (довжина) мм. Крім того, there is the AF28-optic3000 (library number: M178113) модель волоконно-оптичний датчик температури 2, which has a temperature accuracy of ± 0.5 ℃, a SC fiber optic interface, a temperature measurement range of -40 ℃ -+125 ℃ or -40-+200 ℃ (user selectable), a temperature resolution of 12 bits (0.0625 ℃), and a temperature measurement speed of 10 seconds or 45 секунд (user selectable). These different models can monitor temperature for different operating conditions under their respective parameters.

2、 Характеристики та вимоги до моніторингу температури у високотемпературних і жорстких середовищах

（1） Характеристики моніторингу температури при високій температурі та суворих середовищах
Екологічна складність
У високій температурі та суворих середовищах, часто задіяно кілька комплексних факторів. Наприклад, навколо деяких промислових печей, крім високих температур, також можуть бути такі забруднювачі, як пил і корозійні гази. Біля горна сталеплавильного заводу, велика кількість частинок пилу викидається в навколишнє середовище разом з гарячим повітрям, які можуть адсорбуватися на датчику температури та перешкоджати його нормальній роботі. Тим часом, з хімічними реакціями під час металургійного процесу, утворюються корозійні гази, такі як діоксид сірки, створює ризик корозії датчиків температури.
Витік і випаровування хімічної сировини є звичайним явищем у високотемпературних хімічних виробничих середовищах. Наприклад, після витоку кислотної або лужної хімічної сировини, зміниться кислотність і лужність навколишнього середовища, який має різний ступінь впливу на матеріал оболонки та внутрішні компоненти датчиків температури, і може призвести до таких проблем, як корозія корпусу датчика та коротке замикання внутрішнього кола.
Велика амплітуда зміни температури
Діапазон температурних коливань у високотемпературних середовищах може бути дуже великим. Візьмемо як приклад середовище тестування двигуна в аерокосмічній галузі, the temperature rapidly rises from room temperature to thousands of degrees Celsius during engine start-up and operation. At the combustion chamber of the engine, the temperature can reach around 2000-3000 ℃, while outside the engine body, the temperature may be close to room temperature. Such a huge temperature difference places high demands on the adaptability of temperature monitoring equipment.
In some high-temperature kilns, the temperature inside the kiln needs to be precisely controlled between several hundred degrees and over a thousand degrees during ceramic firing. From the preheating stage of the kiln to different stages of firing, the temperature rise and stability need to be strictly monitored, with temperature changes ranging from tens of degrees Celsius to thousands of degrees Celsius, and high-precision measurement needs to be maintained under such large changes.
There are interfering factors present
High temperature environments are usually accompanied by strong electromagnetic field interference. In the welding workshop for electrical equipment production, welding equipment generates strong electromagnetic fields during operation. Наприклад, during arc welding, the current intensity is high, and the generated electromagnetic field can interfere with the communication lines of ordinary electronic temperature sensors, affecting the accuracy of their data transmission. For fiber optic temperature sensors, although they have a certain resistance to electromagnetic interference, they also need to deal with possible interference from other electromagnetic sources in this strong electromagnetic field environment.
In some special high-temperature environments such as near nuclear reactors, in addition to high temperatures and nuclear radiation, there will also be strong magnetic fields. This strong magnetic field may alter the working state of magnetic field sensitive components in some sensors. If the design of temperature sensors does not fully consider this factor, measurement errors can easily occur.

（2） Requirements for temperature monitoring in high temperature and harsh environments
Стійкість до високих температур
Sensors must be able to withstand extreme temperatures in high-temperature environments. If the sensor itself is not resistant to high temperatures, it is easily damaged in high-temperature environments. Наприклад, in a glass melting plant, the temperature inside the furnace can reach up to around 1600 ℃, and sensors need to be directly or indirectly exposed to such high temperature environments. Their materials must be able to maintain stable physical and chemical properties at this temperature. This requires the structural materials of the sensor, such as the housing and internal sensing elements, to be made of high-temperature special materials. Наприклад, using high-temperature resistant materials such as ceramics and high-temperature alloys as external protective covers for sensors or as carriers for internal key sensing components.
висока надійність
Due to the difficulty of equipment maintenance in high temperature and harsh environments, temperature sensors need to have high reliability. This means that the probability of sensor failure during long-term operation is very low, and it can continuously and stably measure temperature. Наприклад, in scientific research near deep-sea hydrothermal vents, sensors may need to work continuously for months or even years in high-temperature, high-pressure, and highly corrosive underwater environments. The temperature of the underwater hydrothermal fluid there can exceed 300 ℃. If the sensors frequently malfunction, it will not only lead to the loss of research data, but may also cause huge economic losses and safety risks in some special scientific research facilities. So the design and manufacturing process of sensors need to be extremely precise, and the internal circuit or optical path structure must undergo strict stability testing.
high-precision
У високій температурі та суворих середовищах, many industrial production processes require extremely high precision in temperature control. Taking the photolithography process in semiconductor chip manufacturing as an example, even small temperature changes can affect the chemical reaction rate of photoresist and the accuracy of chip patterns. This process requires temperature error control within ± 1 ℃ in an environment of several hundred degrees Celsius. So temperature sensors need to be able to provide high-precision measurements to ensure product quality in production or experimentation. This requires the measurement principle and calibration algorithm of the sensor to be very accurate. Наприклад, fiber optic temperature sensors use optical principles to improve temperature measurement accuracy through precise wavelength detection or light intensity measurement.
Хороша здатність проти перешкод
As mentioned earlier, there are various interference factors in high-temperature and harsh environments. Sensors need to have good anti-interference ability to address these issues. Наприклад, in the high-temperature processing environment of RF heating equipment, RF signals can interfere with surrounding electronic devices. Sensors should be able to accurately obtain temperature information under strong radio frequency interference. For fiber optic temperature sensors, they have a natural advantage in resisting electromagnetic interference, but their design should also avoid the influence of other interference sources, such as using a special fiber optic protective layer to resist light leakage and the mixing of external interference light, while optimizing the internal signal processing circuit to improve the filtering ability of interference signals.

3、 Application case of Fiber M fiber optic temperature sensor in high temperature and harsh environment

Petrochemical industry
In the refining units of petrochemicals, there are numerous high-temperature reaction vessels and pipelines. Наприклад, in the distillation process of crude oil, the internal temperature of the distillation tower can reach 300-400 ℃. Fiber M fiber optic temperature sensors can be installed inside the reactor or outside the pipeline to monitor temperature in real-time. Due to its corrosion resistance, стійкість до високих температур, and electromagnetic interference resistance, it can work stably for a long time in environments filled with oil and gas, високі температури, and corrosion risks. By accurately monitoring temperature, the distillation process of crude oil can be better controlled, improving the quality and yield of petroleum products. If traditional electronic temperature sensors are used, the oil and gas environment may pose a risk of explosion, and electronic components are easily corroded and damaged. На противагу, fiber optic temperature sensors have higher safety and reliability.
Aerospace field
In the testing and operation monitoring of aircraft engines, the temperature around the turbine blades inside the engine is extremely high. Наприклад, at the outlet of the combustion chamber of a high-performance jet engine, the gas temperature can exceed 2000 ℃. Fiber M fiber optic temperature sensors can measure temperature near the blades at such high temperatures, providing accurate temperature data for engine performance evaluation and optimization. Due to the complexity of the operating environment of aerospace equipment, including high-speed airflow, strong electromagnetic radiation, тощо, the small size, high anti-interference ability, and high temperature resistance of fiber optic sensors make them ideal temperature monitoring devices. In the manufacturing process of composite material structures for aircraft, the drying and curing processes need to be carried out in a high-temperature environment. Fiber optic temperature sensors can accurately monitor the temperature to ensure the quality of composite materials.
metallurgical industry
During the smelting process in a steel furnace, the temperature at which the metal inside the furnace melts can reach 1500-1600 ℃. Fiber M fiber optic temperature sensors can adapt to such high temperature environments and monitor the temperature inside the furnace in real-time. Due to the presence of a large amount of dust, вібрація, and electromagnetic interference in the smelting workshop, the non-contact measurement method, anti-interference ability, and high temperature resistance of fiber optic sensors enable them to work stably. Точний контроль температури допомагає контролювати хімічні реакції в процесі виробництва сталі та покращувати якість сталі. У процесі прокатки металу, температуру поверхні високотемпературного прокатного стану також необхідно точно контролювати. Волоконно-оптичні датчики температури можуть бути встановлені поблизу прокатного стану, щоб надавати дані про температуру для оптимізації процесу прокатки.