Principle of Electromagnetic Radiation Meter
The electromagnetic radiation measuring instrument is mainly composed of sensors, filter network, amplification part, analog-to-digital conversion, keyboard control, single-chip control unit, display and alarm parts, etc. The whole system is powered by 9v battery, and the electromagnetic signal detected by the sensor probe is sent to the amplifier circuit through the filter network. The filtered and amplified signal enters the analog-to-digital conversion module, and the converted digital signal is sent to the single-chip microcomputer for processing. In the program design, the obtained data is calculated to obtain the magnitude of the electromagnetic radiation power density, which is displayed on the liquid crystal module, and has the functions of peak hold and peak value display. At the same time, the data exceeding the limit value will be alarmed, indicating that the measured power density value exceeds the limit value.
