霍尔传感器是根据霍尔效应制作的一种磁场传感器。霍尔效应是磁电效应的一种，这一现象是霍尔（1855—1938）于1879年在研究金属的导电机构时发现的。后来发现半导体、导电流体等也有这种效应，而半导体的霍尔效应比金属强得多，利用这现象制成的各种霍尔元件，广泛地应用于工业自动化技术、检测技术及信息处理等方面。霍尔效应是研究半导体材料性能的基本方法。通过霍尔效应实验测定的霍尔系数，能够判断半导体材料的导电类型、载流子浓度及载流子迁移率等重要参数。
霍尔传感器是依据霍尔效应制作的。是霍尔1879年在研究金属导电机构时发明的，之后有在导电流体和半导体中均发现此效应。霍尔器件拥有着众多特点，它体积小，重量轻，安装方便，功耗小，频率高还生命长，耐振动不怕油污，水汽，盐雾灰尘等污染。
霍尔效应传感器也称霍尔传感器，是一个换能器，将变化的磁场转化为输出电压的变化。霍尔传感器首先是实用于测量磁场，此外还可测量产生和影响磁场的物理量，例如被用于接近开关、霍尔、位置测量、转速测量和电流测量设备。
通常，霍尔效应传感器和电路相连，从而允许设备以数位（开/关）模式操作，在这种情况下可以被称为开关。工业中常见的设备，例如气缸，也被用于日常设备中，如一些打印机使用他们来监测缺纸和敞盖的情况。当键盘被要求高可靠性时，便也设计霍尔传感器在其按键内。
霍尔电流传感器
霍尔电流传感器基于磁平衡式霍尔原理，根据霍尔效应原理，从霍尔元件的控制电流端通入电流Ic，并在霍尔元件平面的法线方向上施加磁场强度为B的磁场，那么在垂直于电流和磁场方向（即霍尔输出端 之间），将产生一个电势VH，称其为霍尔电势，其大小正比于控制电流I。与磁场强度B的乘积。 即有式中：K为霍尔系数，由霍尔元件的材料决定；I为控制电流;B为磁场强度; VH为霍尔电势。
霍尔电流传感器是按照霍尔效应原理制成，对安培定律加以应用，即在载流导体周围产生一正比于该电流的磁场，而霍尔器件则用来测量这一磁场。因此，使电流的非接触测量成为可能。
Holzer sensor is a magnetic field sensor based on Holzer effect. Hall effect is a kind of magnetoelectric effect, which was discovered by Hall (1855-1938) in 1879 when he studied the conductive mechanism of metals. It was found that semiconductors and conducting fluids also have this effect, and the Hall effect of semiconductors is much stronger than that of metals. Various Hall elements made from this phenomenon are widely used in industrial automation technology, detection technology and information processing. Holzer effect is the basic method to study the properties of semiconductor materials. The Hall coefficient measured by Hall effect experiment can be used to judge the conductive type, carrier concentration and carrier mobility of semiconductor materials.
The Holzer sensor is based on the Holzer effect. It was invented by Hall in 1879 when he studied the conductive mechanism of metals, and this effect was later found in conducting fluids and semiconductors. Hall devices have many characteristics, such as small size, light weight, easy installation, low power consumption, high frequency and long life, vibration resistance is not afraid of oil pollution, water vapor, salt spray dust and other pollution.
Hall effect sensor, also known as Hall sensor, is a transducer that converts the changing magnetic field into the change of the output voltage. Hall sensors are first used to measure magnetic fields, in addition to measuring physical quantities that produce and affect magnetic fields, such as proximity switches, halls, position measurements, rotational speed measurements, and current measurements.
In general, Hall effect sensors are connected to circuits that allow devices to operate in digital (on/off) mode, in which case they can be called switches. Common devices in industry, such as cylinders, are also used in everyday equipment, such as some printers that use them to monitor paper shortages and openings. When the keyboard is required to be highly reliable, the Holzer sensor is also designed in its key.
Hall Current Sensor
Hall current sensor is based on magnetic balance Hall principle. According to Hall effect principle, current Ic is introduced from the control current end of Hall element, and magnetic field intensity B is applied in the normal direction of Hall element plane. Then an electric current will be generated perpendicular to the direction of current and magnetic field (i.e. between Hall output). The potential VH is called the Holzer potential, which is proportional to the control current I. The product of magnetic field intensity B. That is, in the formula: K is the Hall coefficient, determined by the material of the Hall element; I is the control current; B is the magnetic field strength; VH is the Hall potential.
Hall current sensor is based on the principle of Hall effect, the application of ampere law, that is, around the current-carrying conductor to produce a magnetic field proportional to the current, and Hall devices are used to measure this magnetic field. Therefore, it is possible to make the non-contact measurement of the current.
