Proximity Sensors in Metal Detector gate

[faraznizamani]

I want to use an "inductive proximity sensor" for metal detector gate, but the problem is its range is (generally) under 50mm (2 inches), is there any way I can increase its range?
or is there any alternate sensor or way to detect the metal ?


Thank you.

Faraz Nizamani

 

[berkeman]

I want to use an "inductive proximity sensor" for metal detector gate, but the problem is its range is (generally) under 50mm (2 inches), is there any way I can increase its range?
or is there any alternate sensor or way to detect the metal ?


Thank you.

Faraz Nizamani

Do you mean a walk-through metal detector, like those used at courthouses and airports?

http://science.howstuffworks.com/airport-security3.htm

.

 

[Mike_In_Plano]

Do you mean an inductive sensor to tell when a vehicle is overhead? They sale those to apartment complexes and for traffic light controllers.

 

[faraznizamani]

@berkeman: Yes .. a walk-through metal detector