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霍爾傳感器是什么?[特點及工作原理詳解]

作者:昆山丹瑞傳感器 來源:www.siliconewhisperer.com 日期:2018-9-25 11:32:58 人氣:4188

霍爾傳感器是根據霍爾效應制作的一種磁場傳感器?;魻栃谴烹娦囊环N,這一現象是霍爾(1855—1938)于1879年在研究金屬的導電機構時發現的。后來發現半導體、導電流體等也有這種效應,而半導體的霍爾效應比金屬強得多,利用這現象制成的各種霍爾元件,廣泛地應用于工業自動化技術、檢測技術及信息處理等方面?;魻栃茄芯堪雽w材料性能的基本方法。通過霍爾效應實驗測定的霍爾系數,能夠判斷半導體材料的導電類型、載流子濃度及載流子遷移率等重要參數。

  霍爾傳感器是依據霍爾效應制作的。是霍爾1879年在研究金屬導電機構時發明的,之后有在導電流體和半導體中均發現此效應?;魻柶骷碛兄姸嗵攸c,它體積小,重量輕,安裝方便,功耗小,頻率高還生命長,耐振動不怕油污,水汽,鹽霧灰塵等污染。

   霍爾效應傳感器也稱霍爾傳感器,是一個換能器,將變化的磁場轉化為輸出電壓的變化?;魻杺鞲衅魇紫仁菍嵱糜跍y量磁場,此外還可測量產生和影響磁場的物理量,例如被用于接近開關、霍爾、位置測量、轉速測量和電流測量設備。

  通常,霍爾效應傳感器和電路相連,從而允許設備以數位(開/關)模式操作,在這種情況下可以被稱為開關。工業中常見的設備,例如氣缸,也被用于日常設備中,如一些打印機使用他們來監測缺紙和敞蓋的情況。當鍵盤被要求高可靠性時,便也設計霍爾傳感器在其按鍵內。

  霍爾電流傳感器

  霍爾電流傳感器基于磁平衡式霍爾原理,根據霍爾效應原理,從霍爾元件的控制電流端通入電流Ic,并在霍爾元件平面的法線方向上施加磁場強度為B的磁場,那么在垂直于電流和磁場方向(即霍爾輸出端 之間),將產生一個電勢VH,稱其為霍爾電勢,其大小正比于控制電流I。與磁場強度B的乘積。 即有式中:K為霍爾系數,由霍爾元件的材料決定;I為控制電流;B為磁場強度; VH為霍爾電勢。

  霍爾電流傳感器是按照霍爾效應原理制成,對安培定律加以應用,即在載流導體周圍產生一正比于該電流的磁場,而霍爾器件則用來測量這一磁場。因此,使電流的非接觸測量成為可能。

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.

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