The Development Of A Nuclear Signal Processing Circuit

Traditional Circuit for Nuclear Signal Processing only includes some analog circuitry such as mainamplifier,pole-zero cancellation circuit,discriminator,shaping circuit and so on.. The parameters adjusting of amplifier gain,threshold of discriminator and others need to change the resistance values of the mechanical potentiometer manually.It cause great inconvenience to the operator and affect the accuracy of measurement also. Today,with the development of micro-controller technology,intelligentize has become the leading direction of the development of radioactivity surveying instrument. It will has far-reaching impact on the application of nuclear technology and applications,defending engineering,scientific experiment and other areas. Singlechip technology,which make all kinds of equipment intelligent,has been widely used in some fields of Intelligent management and process control such as industrial instrumentation,military and civilian management and so on. It can constitute abundant forms of control system and data acquisition system etc. Singlechip has some advantages such as low power strong control function,flexible extension,miniaturization etc. It may enable controlled instrumentation digital intelligent miniaturized and powerful. With the increasing demand for industrial control field,more and more instruments and equipment useing MPU technique to achieve intelligent control.Under this background,I design two types of digital signal processing circuit, which digital-to-analog converters or digital potentiometer are controlled by single chip to gain the function of amplifier gain and adjust threshold of discriminator. This paper mainly introduces the Digital Circuit for Nuclear Signal Processing which using AT89S52 single chip program-control digital potentiometer X9241w adjust related parameters.And I write system applications also. Circuit include the interface between MCU and PC,circuit controlled by singlechip,the nuclear signal amplification circuit,pole-zero cancellation circuit,discriminator and shaping circuit. Among them,amplifier gain and threshold of discriminator.can be change with the different output of Single Chip program-control digital potentiometer.Single Chip and PC-communication via USB interface. Application include single chip control system and human-machine user interface.And this Application is based on a computer with a USB interface in the Microsoft windows system using C language development. Finally, the hardware welding and system testing completed. The system amplifie the Nuclear Radiation Pulse from the preamplifier,discriminate and shape its, then get out TTL signals to RAM of AT89S52.This system reaches the miniaturization, high precision, easy operation, stable operation and low cost.