The characteristics of Holzer element
The characteristics of Holzer element
The semiconductor component made of Holzer effect is called the Holzer element.The so-called Holzer effect is the phenomenon that the Holzer electromotive force is generated in the direction perpendicular to the current and the magnetic field when the current is passing through the current and the direction of the current is perpendicular to the direction of the external magnetic field.
The type of Holzer element
The materials used in Holzer devices include germanium,silicon,InSb,InAs,GaAs and so on. Holzer devices can be divided into two categories according to their fabrication and identification:one is made of semiconductor single crystals,called body Holzer devices, and the other is made of vacuum evaporation or epitaxy,diffusion and so on to make semiconductor single crystal or polycrystalline thin film on the appropriate substrate. It is called the film type Holzer device.Thin film Holzer devices can be fabricated in integrated circuits.The working principle and shape of the Holzer element.
It can be seen from the schematic that the magnetic field in the semiconductor wafer to control the current and apply the induction intensity of B in the vertical direction of the sheet will produce a Holzer potential of VH in the direction perpendicular to the current and the magnetic field. The relation between them is that in the Vu= KqIB formula, KH is Holzer sensitivity, and it is a material and a few.What size is the coefficient? Hall components usually have four pins,two power terminals and two output terminals.Its circuit symbols and typical application circuits are shown in Figure 11.E is a DC power supply and RP is a potentiometer that controls the current I.I is usually a couple of tens to hundreds of Ma;RL is a load.Holzer element has the characteristics of simple structure,good frequency characteristic (from DC to microwave),high sensitivity,small volume,long life and so on.Therefore,it is widely used in displacement measurement,magnetic field measurement,proximity switch and limit switch circuit.
Detection of Hall element
Measuring the resistance of the input and output resistance:attention should be paid to the correct selection of the electrical barrier range of the multimeter,to ensure the accuracy of the measurement.For the HZ series products,we should select the " RX10 " block measurement of the multimeter;for HT and HS series products,the " RX1 " block measurement of the multimeter should be adopted,and the measurement results should be in accordance with the parameters of the manual.If the measured resistance is infinite or zero,it is explained that the measured Hall element is damaged.
Detection Sensitivity ( KH ):generally,a double table method is used to place a table in " RX1 " block or " RX 10 " block ( depending on the size of the control current I ),to provide control current for the Hall element,the other multimeter is placed in the DC 2.5V block to measure the electromotive force VH of the Hall element output.With a bar magnet perpendicular to the surface of the Hall element,at this time,the pointer of the voltmeter should be significantly deflected to the right.In the case of the same test conditions,the greater the angle of the pointer to the right deflection of the voltmeter indicates the higher the sensitivity ( Ku ) of the measured Hall element,when testing,we should pay attention not to connect the input and output leads of the Hall element, otherwise,the correct result will not be detected.