Both electronic ceramic powders and electronic ceramic components such as capacitors, resistors, and inductors have high requirements for electrical performance. When the formula and production process are relatively fixed, the cumulative thermal effect of fired products is a direct factor affecting the electrical performance of the product, and the thermal effect is mainly a comprehensive reflection of the firing temperature, insulation time, and firing atmosphere. Different firing temperatures, holding times, and firing atmospheres will sinter products with different properties; The same batch of products with the same insulation time may also produce products of different qualities when placed in different parts of the furnace.

In actual production, it is difficult to directly judge or select good products from the production process and put them into the next production process, so the defect rate of the produced products is easily out of control. However, the temperature measurement points of various types of kilns are relatively fixed, and the distribution of actual detection points of thermocouples is also limited, which is not conducive to grasping the true state of products during firing.

In addition, even if the temperature errors caused by thermocouples of different materials and different thermocouples of old and new are ignored when measuring temperature, thermocouples can only measure the radiation heat in the firing temperature, and cannot measure the heat transfer and specific insulation time of the kiln furniture, as well as the comprehensive thermal effect of the actual firing atmosphere. At this time, if several temperature measuring rings are placed before or during firing, not only the actual temperature in the furnace can be measured and the furnace temperature can be adjusted in advance, but also the actual thermal effect of product firing can be reflected according to the diameter, color depth and shape change of the temperature measuring ring after firing. The temperature measuring ring has a compact volume and is convenient to use. It can not only make horizontal comparisons of products sintered in different kilns, but also retain the tested temperature measuring ring samples and data for vertical comparisons of products sintered in different periods. This provides a real historical basis for tracking product quality and ensures strict management of product quality.