特性
Characteristic
金属检测仪的精确性和可靠性取决于电磁发射器频率的稳定性，一般使用从80 to 800 kHz的工作频率。工作频率越低，对铁的检测性能越好；工作频率越高，对高碳钢的检测性能越好。检测器的灵敏度随着检测范围的增大而降低，感应信号大小取决于金属粒子尺寸和导电性能。
The accuracy and reliability of metal detectors depend on the frequency stability of electromagnetic transmitters. Generally, the working frequency is from 80 to 800 kHz. The lower the working frequency, the better the detection performance of iron; the higher the working frequency, the better the detection performance of high carbon steel. The sensitivity of the detector decreases with the increase of the detection range. The size of the induction signal depends on the size of the metal particles and the conductivity.
由于电流的脉动和电流滤波的原因，金属检测仪对检测物品的输送速度有一定的限制。如果输送速度超过合理范围，检测器的灵敏度就会下降。
Because of the current fluctuation and current filtering, the metal detector has some limitations on the conveying speed of detecting items. If the conveying speed exceeds a reasonable range, the sensitivity of the detector will decrease.