I have a very serious problem regarding my walk through gate.
I have opted it as final year project at university.
I am using BFO technology for metal detection and making a walk through gate with 6 zones.
For that purpose i made 6 detector circuits of BFO. The detector circuits are working quite fine independently and detect copper piece (PCB) of 4 square inches at about 10 inches but...the problem is that when i mount the coils on the gate (wooden frame) and make them work together they do not work. If at all i tune them with a lot care they do not cover more than 2 or 3 inches range and also gave small beep after some seconds. First i thought that the problem was with the power supply since it was common for the six zones. I changed the power supply and made six different power supplies for the six detectors. They still give no response.
Now what i conclude is that when i mount the coils together on the gate their magnetic fields interact in a way to cause this problem.
Can anyone please guide me how to mount the coils so that they may work together and not interfere. The width of my gate is 2.5 feet. Coil specs are diameter:9 inches, SWG: 21 , turns: 16. First i used dia: 9 inches, SWG 26, turns 35 but that was not letting me tune properly.
Can any body tell me how this SWG , Diamwter and turns affect the range of detection.
Do i need to change the coil design so that they may not interact or i need to shield my coils some way. Please please help some one.
Following is how i have attached the coils. kindly some1 guide me if its the right way!
I have opted it as final year project at university.
I am using BFO technology for metal detection and making a walk through gate with 6 zones.
For that purpose i made 6 detector circuits of BFO. The detector circuits are working quite fine independently and detect copper piece (PCB) of 4 square inches at about 10 inches but...the problem is that when i mount the coils on the gate (wooden frame) and make them work together they do not work. If at all i tune them with a lot care they do not cover more than 2 or 3 inches range and also gave small beep after some seconds. First i thought that the problem was with the power supply since it was common for the six zones. I changed the power supply and made six different power supplies for the six detectors. They still give no response.
Now what i conclude is that when i mount the coils together on the gate their magnetic fields interact in a way to cause this problem.
Can anyone please guide me how to mount the coils so that they may work together and not interfere. The width of my gate is 2.5 feet. Coil specs are diameter:9 inches, SWG: 21 , turns: 16. First i used dia: 9 inches, SWG 26, turns 35 but that was not letting me tune properly.
Can any body tell me how this SWG , Diamwter and turns affect the range of detection.
Do i need to change the coil design so that they may not interact or i need to shield my coils some way. Please please help some one.
Following is how i have attached the coils. kindly some1 guide me if its the right way!
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