Neutron Monitor Development And Research

The working principles and characteristics of signal collection circuit, liquid-crystal display (LCD), programmable logic device and MCU controlling circuit of neutron monitor device are discussed.Neutron monitor device monitors whether the neutron generator is working in stable state, so that the workers on the spot can adjust neutron generator appropriately for working in order. However, neutron monitor device at present is not portable for working at outdoors . For the need of monitoring the neutron generator, a kind of neutron monitor device is designed and developed, which is very suitable for our application and scientific searching.This neutron monitor device introduces LCD for displaying data. In comparison with LED (Light Emitting Diode), LCD's capacity is smaller. Moreover, with integration of drive circuit and liquid-crystal screen, the user need not design another circuit for drive. LCD will display wanted data by writing data to specified instruction register and specified data register through control bus and data bus, which makes operation easier.Programmable logic device is introduced into this design of neutron monitor device. Programmable logic device is a new developing chip. Its integration is very more and more high from less than 100 gates to more than 10000 gates, and FPGA (Field Programmable Gates) even more than a million gates. The circuit can be programmed into a chip, which makes the circuit work faster and more stable. In the design of neutron monitor device, a part of circuit is programmed into a chip, which improves the performance of neutron monitor device and reduces the area of PCB greatly.Neutron monitor device uses MCU (Micro Control Unit) as the control unit. MCU is the control center, and it controls LCD , programmable logic device, keyboard and communication with computer. It makes this system work harmony and fluently.