[电子] 金属探测器
...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。 地下金属探测器(Metal Detector)作为电磁法的一个具体应用,是一种专门用来探测金属的仪器。因为在考古发掘中,有相当多的古物都是金属制品。
金属探测仪
食品金属探测仪(metal detector)是一款高性能专为安防设计的食品金属探测仪。与传统探测器相比:探测区工作面的特殊设计,探测面积大、扫描速度快、灵敏度极高。
金属检测仪
... 结晶设备 crystallzing equipment 金属检测仪 metal detector 金属软管灌封机 metallic collapsible tube filling-sealing machine ...
金属探量观测器
... metal金属 metal detector金属探量观测器 metal ornament金属饰物 ...
地下金属探测器
冷金属检测器
电子金属探测器 ; 材 电子金属检测器
metal detector:
metal + detector
A metal detector is an electronic instrument which detects the presence of metal nearby. Metal detectors are useful for finding metal inclusions hidden within objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe which can be swept over the ground or other objects. If the sensor comes near a piece of metal this is indicated by a changing tone in earphones, or a needle moving on an indicator. Usually the device gives some indication of distance; the closer the metal is, the higher the tone in the earphone or the higher the needle goes. Another common type are stationary "walk through" metal detectors used for security screening at access points in prisons, courthouses, and airports to detect concealed metal weapons on a person's body.The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field. If a piece of electrically conductive metal is close to the coil, eddy currents will be induced in the metal, and this produces a magnetic field of its own. If another coil is used to measure the magnetic field (acting as a magnetometer), the change in the magnetic field due to the metallic object can be detected.The first industrial metal detectors were developed in the 1960s and were used extensively for mineral prospecting and other industrial applications. Uses include de-mining (the detection of land mines), the detection of weapons such as knives and guns (especially in airport security), geophysical prospecting, archaeology and treasure hunting. Metal detectors are also used to detect foreign bodies in food, and in the construction industry to detect steel reinforcing bars in concrete and pipes and wires buried in walls and floors.