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连铸熔渣检测存在首不少困难,例如,要从各种干扰中检测十分微弱的有用信号,保护传感器能经受高达900℃的环境温度,而且它的大小受有限制。此外,导电的长水口对电涡流检测也非常不利。本课题还是采用电涡流传感器,因为这种传感器较灵敏,容易制造,也较便宜、为了适合导电的长水口,并使传感器小型化,必须设计大幅度的AC恒流源,用来激励检测线圈(传感器)。检测仪器除了恒流源外,主要还有温度补偿、脉冲形成、脉宽鉴别以及编码、译码等电路。本文叙述检测装置的基本要求和设计原理。最后,给出装置的技术指标和工业试验结果。
There are many difficulties with continuous casting slag testing. For example, to detect very weak useful signals from a variety of disturbances, the protection sensor can withstand ambient temperatures of up to 900 ° C and its size is limited. In addition, the conductive long nozzle on the eddy current testing is also very unfavorable. The subject is the use of eddy current sensor, because the sensor is more sensitive, easy to manufacture, but also cheaper, in order to adapt to the conductive long nozzle, and to miniaturize the sensor, you must design a substantial AC constant current source, used to stimulate the detection coil (sensor). Detection equipment in addition to the constant current source, there are mainly temperature compensation, pulse formation, pulse width identification and coding, decoding and other circuits. This article describes the basic requirements of test equipment and design principles. Finally, given the technical indicators and industrial test results.