金属探测器的灵敏度

Sensitivity of metal detectors

灵敏度的高低取决于两方面的因素：孔径的尺寸与工作频率。孔径的尺寸越小，探头的灵敏度就越高。其次，频率越高，灵敏度则也越高。不过，提高频率并不自动意味着保证探测能力的提高，因为它可能会使食品本身对探测器产生一个很强的信号，也就是通常所说的产品效应。因此，确定一个不致出现误动作的最高频率使探测器既探测了污染物、又不会发出错误警报，从而避免了产品的浪费。为了得到最佳的结果，应该对每种待检验的产品确定特定的探测参数并自动予以记录和保留。

The sensitivity depends on two factors: the size of the aperture and the frequency of the work. The smaller the size of the aperture, the higher the sensitivity of the probe. Secondly, the higher the frequency, the higher the sensitivity. However, increasing the frequency does not automatically mean that the detection ability is improved, because it may make the food itself produce a strong signal to the detector, which is usually referred to as the product effect. Therefore, determine a maximum frequency which does not appear misoperation, so that the detector detects pollutants and does not send false alarms, thereby avoiding the waste of products. In order to get the best results, specific detection parameters should be determined for each product to be tested and recorded and retained automatically.

检验金属探测器性能的行业标准，是通过探测器检测到的各种金属球的尺寸。但事实上，污染物的形状可能是金属丝或金属片的碎屑。它们依自己在探测器孔径位置的不同而对探测器会产生不同的信号，即通常所说的方位效应。

The industry standard for testing the performance of a metal detector is the size of a variety of metal balls detected by the detector. But in fact, the shape of the contaminant may be the detritus of a wire or a piece of metal. They produce different signals depending on their location in the detector's aperture, that is, the usually described azimuth effect.