Development Of An Experimental System For Cell Exposure To Electromagnetic Irradiation

This main objective of this paper is to study the manufacture of an experimentsystem about cells exposure to the900MHz and1800MHz electro-magnetic irradiation.Several modules are designed with single-chip microcomputer. The signal source hasrealized two standard radiation waveform, continuous wave and pulse modulation wave.The standard size of900MHz and1800MHz rectangular waveguide are used as theirradiation boxes, and uniform standing wave field distribution is established byinverting dual incentive signal. The power detection module can measure the reflectedpower accurately. As the base of SAR evaluation, the absorption power of cells isdefined as the difference of the incident power and reflection power. The temperaturesystem contains three parts, which are heating module, temperature detection moduleand fans controlled module respectively, which offer the steady environment for ourexperiments about the biology effect on cells explored at the electro-magnetic fields.According to the function anticipated, we design circuits firstly and divide it to8parts. Every part has its special function. The significant one is the part for main controlof system. One part can create radiation with radio frequency. Other parts control thepower detected and temperature detected, the fans, the extent of heating, and theconcentration of CO2and relative humidity. We also offer a LCD part to display ourdata detected. Combined with the analysis of the rationality and feasibility of the design,we complete the hardware architecture with Protel and Cadence. Combination ofhardware circuit, we carry out the SCM software simulation and debugging on theplatform of Keil. PPI communication protocol is designed with chip selected bus anddata bus at8bits, which realize the bidirectional transmission of data between modules.Based on the stability and effectiveness of the transmission, this paper gave a detailedaccount of the relative merits about the two implementations. In the temperature controlsystem, PID algorithm is introduced and used to overcome the inertia of heating furnace.After the experiments, there are some drawings of experimental data, based on which allthe parameters of the modules are corrected.