A
Anonymous
Guest
Sorry to all for not engaging in the previous posts and questions on coils for detecting meteorites. Just been very busy on a design project. Reading through the posts, it looks like most of the points have been covered, so I will just add a little from my practical experience with big coils.
Mention was made of a detector called the Agritec. This was a detector specifically designed to mount on tractors and forage harvesters to give advance warning of any metal object in the grass that was likely to cause damage to the cutterheads in silage production. Small items were not a problem, but anything upwards of a 3/8in x 2in diameter bolt needed to be detected. The Agritec used a 5ft x 18in rectangular TX/RX coil with an identical secondary RX coil mounted above it, spaced about 1ft. The signal from the second coil was subtracted from the first, at the front end amplifier, to give low frequency noise cancelling. This was necessary because the coil array bobs up and down as the tractor is driven over a field and the induced emf
Mention was made of a detector called the Agritec. This was a detector specifically designed to mount on tractors and forage harvesters to give advance warning of any metal object in the grass that was likely to cause damage to the cutterheads in silage production. Small items were not a problem, but anything upwards of a 3/8in x 2in diameter bolt needed to be detected. The Agritec used a 5ft x 18in rectangular TX/RX coil with an identical secondary RX coil mounted above it, spaced about 1ft. The signal from the second coil was subtracted from the first, at the front end amplifier, to give low frequency noise cancelling. This was necessary because the coil array bobs up and down as the tractor is driven over a field and the induced emf