Speed Digital Measurement Method

Measurement speed digital way can be done by way of inductive, capacitive and optical. Measurements by means of induction was performed using a serrated rotor, stator is made of a coil wound on a permanent magnet. The output of this sensor in the form of voltage pulses. The use of this method is quite simple, very practical without requiring complex mechanical coupling, and has a high reliability, but weakness can not be used to measure low speeds and can not display the direction of rotation.

3:48 Image Sensor Digital Speed ​​Inductor Type

Another type of speed sensor is a way of Optics. The rotor is made of metal or plastic material is dark, the rotor is made hollow to give the signal to the light sensor. If desired, the speed direction information, use two sensors mounted close together. Sultry direction information can be obtained by detecting the sensor which lebioh first receive beam (active). The light sensor is very sensitive to impurities dust, olej therefore keselurujan sensor parts (stator and rotor) must be placed in sealed packaging.

The advantages of this sensor has a very high linearity for a very broad range of areas. The disadvantage is still needed mechanical coupling with the system in the sensor.

3:49 image Optics How to Speed ​​Sensor

Another digital speed sensors are used kapsitf, the rotor is made of metal, rounded shape. The rotor rotates with the shaft is not concentric or kepinggir shifted slightly. The stator is made of metal material fitted with curved to increase the sensitivity of the sensor. When the rotor is rotated there will be a change in the capacitance between the rotor and stator due to rotation of the rotor is not symmetrical. Implementation of this sensor if required mounting teruatama speed sensor which is a fluid environment.

3:50 Image Sensor Speed ​​Capacitance Method.