By recording heads in magnetic tape Magnetic Grid design: an important feature of the magnetic grid is the magneticgrid ruler and head in contact state. The working principle of the magnetic grid is a magnetoelectric conversion, in order to ensure that the head is the output signal amplitude stability, taking into account the air gap reluctance,are not allowed to exist and variable between the magnetic grid ruler and thehead, it is best to contact. This belt type magnetic grid work head is pressed into the tape, so instant with face some irregularities, the head and the tapecan also good contact. About 0.01mm of the gap between the linearmagnetic magnetic grating ruler and head, because the assembly andadjustment can not reach the ideal state, so the actual line type magnetic grid is quasi contact state. Another important feature of the magnetic grid ismagnetic grating ruler is in a tension state.) on record magnetic wave interval strictly equal a process known as magnetic recording. Magnetic taperecording has good magnetic wave called a magnetic ruler. Magnetic gratingruler adjacent gate wave interval distance is called the magnetic gratingwavelength, also known as the magnetic grid pitch (pitch). Magnetic grating ruler is the base element magnetic grating digital readout system. Obviously,the wavelength is the magnetic grating length measuring unit. Any of the measured length corresponding to the number of available wavelength andto represent the magnetic grid. Made of hard alloy magnetic grating rulerbodies can meet certain requirements. Can also be made of magneticmaterial surface coated with a layer of hard magnetic alloys. Made of hardalloy magnetic material of magnetic railings ruler performance have the following requirements: good magnetic materials have larger remanence andcoercivity, namely loop material should be a big fat. Good magnetic uniformmagnetic materials can be more uniform as possible, in order to ensure theequal amplitude recorded magnetic remanence, otherwise it will affect the accuracy of the magnetic grid. Magnetic stability of the composite goodrecording magnetic remanence intensity after should not have performancealong with the extension of time and quickly weakened. Materials with good mechanical properties should have high mechanical strength, hardness andwear resistance, easy machining and is not easily affected by external temperature and humidity. Frequency characteristics of certain can guarantee in the remanent intensity the certain requirements of the record on the desired frequency (wavelength) of the magnetic wave. Hard alloy is commonly used in Cu-Ni-Fe alloy or Fe-Cr-Co alloy; magnetic coating of commonly used components are Ni, Co, P.
.the advantage of non contacting measurement, no backlash, convenient installation and maintenance, high precision, long stroke can be infinitely connected 0.1-100 meters long, high ability of anti pollution, the environment is extremely bad environment without loss ofaccuracy, in the water, oil, iron work, simple installation, installation allowserror cheap price, ten years without loss of excitation.