Microwave and high-frequency type industrial equipment is mainly used for handling, processing and producing wood products, rubber products, industrial raw materials, chemical materials, food and medicine, etc. As the applications and products varies, the operation mode is also quite different. The main operation mode of these equipments can be divided into three categories. First, the transmission line production, the second is sealed vacuum-type fixed operation, the third is repeated mechanical operation.

        The emission volume of the microwave and high-frequency, which is considered to be the core technology, depends directly on the temperature, humidity and weight of the material to be treated. In the above mentioned three operation modes，it is necessary to monitor the value of temperature. In the microwave and high-frequency environment，only the products that adopting optical sensing principle can work stable and long-term. While among all the optical sensing principles，only infrared temperature sensing technology and fluorescent optical fiber temperature sensing technology are able to meet the needs of low-cost per measuring point.

        Infrared temperature measurement is more suitable for surface temperature monitoring. Fluorescence optical fiber temperature measurement fit for embedded internal temperature monitoring. In above mentioned three different operation mode equipment，infrared temperature measurement technology is more suitable for transmission line production equipments，while the fluorescent optical fiber temperature sensing technique is more suitable for sealed vacuum-type fixed operation and repeated mechanical operation equipments，We can say that fluorescent optical fiber temperature sensing technique is the key technology to solve the problems in these two kind of equipments.