Post on 14-Apr-2017
Proximity sensors
Inductive Proximity sensorsbyAhmed mahmoud ahmed
Components
An inductive proximity sensor has four elements:CoilOscillatorcreates a radio frequency field that is shaped and defined by the coil and coreTrigger circuitrectifies the AC sine wave signal to DCOutputIt changes according to the presence and absence of the target
Basic operationProximity sensors are one type of pre-touch sensors.
Inductive proximity sensors operate under the electrical principle of inductance where a fluctuating current, which by definition has a magnetic component, induces an electromotive force (emf) in a target object.
Basic operationWhen a conducting object is found in sensors domain it reduces the induced current in the electrodes.
This change in the electric field is detected by the sensors.
Specialized algorithms process the data and instruct the rest of the machine to take appropriate action
Example from IntelRobotic handThe researchers have incorporated the sensors into a robotic hand as well, allowing mechanical fingers to adjust to the size and shape of an object that they encounter.
The goal, is to improve the ability of robots to grasp objects in unstructured human environments.
The video
Wind turbines
Wind Turbines uses proximity sensors to determine the best direction to which it should be adjusted to get maximum wind possible
AdvantagesThey are very accurate compared to other technologies
Have high switching rate
Can work in harsh environmental condition
Minesweeper A robot to sweep over an object and collect EF information from it.
The algorithm then compares, in near real time, this data to a series of prerecorded signals that describe various shapes, sizes, and orientations of the object.
When the algorithm finds a reasonably certain match, it adjusts the robotic fingers so that they can grasp the object.
Disadvantages
It can detect only metallic targets
Operating range may be limited