1. Overview At present, infrared temperature measurement systems have been widely used in various occasions in metallurgical production lines. However, when measuring the temperature of slab in continuous casting machine in the second cooling zone, the problems of measurement accuracy and system reliability always exist. In order to improve the accuracy of slab surface temperature measurement. Changzhou Sijie summarizes various problems reported by users and proposes the following infrared temperature measurement solutions: 2. Various factors affecting slab temperature measurement

1. Overview Hot blast furnace is a heating and blowing equipment for blast furnace (high furnace), it is an indispensable part of modern blast furnace. Modern blast furnaces mostly use regenerative hot blast stoves, whose working principle is to burn gas first, heat the grid bricks of the regenerator chamber with the generated flue gas, and then heat the cold air from the blast station through the hot grid bricks. The hot blast stove is burned and blown alternately, so that the blast furnace can continuously obtain high-temperature hot air. The temperature of hot blast stove vault is an important data for safe and accurate operation of hot blast stove.  Temperature of traditional hot blast stove is measured by thermocouple. The armored double platinum rhodium thermocouple or other thermocouple is used to indirectly control the hot air temperature by measuring the temperature of the insulation wall. Conditions in furnace are always tough alone with high temperature and high pressure. Limited to the requirements of operation environment and instrument’s structure, thermocouple thermometry would result in inaccurate measurement and lag reaction when works in harsh condition such as frequently temperature changes, large pressure fluctuations and event in vibration.  Since a thermocouple works at the high tem

1. Overview Single crystal silicon is widely used in various fields such as semiconductors, solar cells, integrated circuits, and discrete components. Polycrystalline silicon is a raw material for the production of monocrystalline silicon, and the purity of monocrystalline silicon is much higher than that of polycrystalline silicon. The purity of monocrystalline silicon is generally 99.99999%, and can even reach 9N or more than 12N. At present, the Czochralski method is mostly used in domestic and abroad to obtain single crystal silicon.   Czochralski single crystal furnace is composed of mechanical part and electrical part. The mechanical part includes water cooling system, argon system, vacuum system, furnace body, thermal system, and hydraulic system. The electrical part includes speed control unit, heating control unit, heating temperature control and three-phase full bridge power components, equal diameter growth controller, water temperature inspection and status alarm, and relay control unit. (Cited textbook literature.)

1. Overview Polycrystalline silicon is a form of elemental silicon, and its purity is lower than that of monocrystalline silicon. It can be used as a raw material for pulling monocrystalline silicon. Polysilicon is produced by a polysilicon ingot furnace. The production of polysilicon is to load high-purity polysilicon material into an ingot furnace, and after vacuuming, the silicon material is melted into a liquid state, and the silicon material forms a vertical temperature gradient through the automatic operation of the ingot furnace. Liquid silicon slowly recrystallizes from bottom to top, forming a large-grained poly-single-crystal ingot silicon. After the silicon ingot is annealed and cooled, it is released from the furnace to complete the entire ingot casting process. At present, the main traditional processes for polysilicon production in the world are: modified Siemens method, silane method and fluidized bed method. Among them, the production capacity of polysilicon produced by the improved Siemens process accounts for about 80% of the world's total production capacity. The production process takes the modified Siemens method as an example: (1) Loading Place the ceramic crucib

To measure temperature of slab surface by an infrared temperature sensor. The oxide layer, water vapor and dust on the surface of the slab increase the difficulty of measurement. The temperature of the oxide layer surface cannot represent the actual temperature of the slab. The two-color infrared pyrometer of Sijie Optoelectronics can identify the oxidation state of slab, skipping the oxide and measure the temperature of the slab surface accurately. Even if the target is blocked by 95%, it will not affect the measurement result and can effectively overcome the influence of water vapor. When measuring large target objects, the head and tail of the target object will automatically adjust the signal threshold state to avoid false signal output. The response time of the two-color infrared pyrometer is 10ms, and the response time of the one-color infrared pyrometer is 5ms, which can quickly track the continuous change of temperature. Among the curves in the picture, the yellow one is the temperature measurement curve of Sijie, and the red one is the temperature measurement curve of a foreign high-end brand. The yellow curve is clearer than the red curve, and Sijie's pyrometers also have strong processing capabilities in capturing transient signals. Standard stainless steel protective cover (with purge and cooling function), equipment protection grade IP65, suitable for various industrial occasions.

When measuring the temperature of square billet, billet, steel plate, steel bar, etc. at the rolling mill position by an infrared pyrometer. The industrial site environment is harsh, dust, water vapor and other factors will affect the accuracy of temperature measurement. When use Sijie's two-color pyrometer, even if the target is blocked by 95%, it will not affect the measurement result and can effectively overcome the influence of water vapor. When measuring large target objects, the head and tail of the target object will automatically adjust the signal threshold state to avoid false signal output. The response time of the two-color infrared pyrometer is 10ms, and the response time of the one-color infrared pyrometer is 5ms, which can quickly track the continuous change of temperature. The 1:1 LED aiming light accurately indicates the size and focusing distance of the target, and the dirty lens detection function can send out signals in advance to make the equipment basically maintenance-free. Standard stainless steel protective cover (with purge and cooling function), equipment protection grade IP65, suitable for various industrial occasions. Recommended product selection: STRONG-SR-6016 is used for temperature detection of rough rolling and finishing rolling position.

  Use an infrared pyrometer to measure the temperature of the rod and wire. During the measurement, the target moves quickly, the target is jittery, the surface condition is uneven (such as rebar), and it may measure small targets (such as 5mm). The industrial site environment is harsh. Dust, dust, water vapor and other factors will affect the accuracy of temperature measurement. It is recommended to use a two-color infrared pyrometer to measure the temperature of rod and wire processing. Even if the target is blocked by 95%, it will not affect the measurement result and can effectively overcome the influence of water vapor. The minimum detection target can reach 2mm. When measuring large target objects, the head and tail of the target object will automatically adjust the signal threshold state to avoid false signal output. The response time of the two-color infrared pyrometer is 10ms, and the response time of the one-color infrared pyrometer is 5ms, which can quickly track the continuous change of temperature. Standard stainless steel protective cover (with purge and water cooling function), equipment protection grade is IP65, sui