want to know about sensor output

See the sensor manufacturer's datasheet for the device.

Sounds like you are referring to a Hall Effect sensor.

Have a look at this website

You have a rotary proximity sensor. Most of these devices are connected to a PLC. If you do not understand what you are looking at, don't monkey around with it. Your boss will not be pleased with the result.

Question not clear rephrase your question

You can use a counter or frequency measurement device to get data of the shaft turning. A proximity sensor will have a pulse of 24V or similar (depending on power voltage). That can go to the "isolated input" of a device like I-7080 http://www.icpdas-usa.com/products.php?PID=139 . Then a computer or PLC can read the quantity of revolutions or speed of the shaft.

If you have a magnet on the shaft, what you have is probably an "inductive pick-up", not a proximity sensor. An inductive pick-up is basically a coil of wire. When the magnet is right over the end of the coil, the magnetic flux passing through it is high. When the magnet is well away from the coil, the flux in it is small. A voltage will be "induced" [hence the name "inductive pick-up"] in the coil while the flux is changing, due to the movement of the magnet attached to the shaft. Its magnitude will be proportional to : Number of coil turns x rate of change of flux. Therefore peak voltage will be directly proportional to shaft rotation rate. Output waveform is basically a pulse, of a "bell" section shape when drawn on a voltage against time graph.