Magnetic Sensors
Magnetic Sensors
(OP)
The current project I am working on has run into some issues with a magnetic environment sensor. I was wondering if anyone had some tips that might point me in the right direction to help solve this. We have a simple magnetic sensor that is roughly 1" in diameter and about 1" long. It is composed of a magnet with a copper wire coiled around it, potted into a metallic housing. The copper wire runs to 2 pins that leave the housing. The sensor is used to detect a change in environment. This particular environment is a metallic barrel which the sensor travels down and exits from. The sensor travels down the barrel at a high velocity. Flux is constant as the sensor moves within the barrel, when it exits, a change in flux occurs. This induces EMF in the sensor coil that produces a voltage. This voltages passes to a circuit that detects the voltage. The problem we are having is that the sensor is generating too low of a voltage. We are trying to determine what factors determine the voltage that is generated and what we need to do to increase this voltage. The reason I'm asking is that I can't seem to find any sources that have information in this specific area. The sensor is traveling at roughly 700 m/s and there seems to be very little information out there on high speed flux change. The major factors that determine the voltage I know of include: Magnetic Strength, Sensor Velocity, Air Gap, Sensor Resistance, and Sensor Coil Inductance. Other than barrel design, what might be altered to increase the voltage?
Brian
Pro/E Mechanical Design & Checking
Aerospace and Defense
Florida, USA





RE: Magnetic Sensors
RE: Magnetic Sensors
How long is the pipe/cable?
Why not send a Hall effect sensor down?
TTFN
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RE: Magnetic Sensors
Stronger magnet - increased voltage
Higher velocity - increased voltage
Smaller air gap - increased voltage
Sensor resistance and coil inductance as it relates to the number of turns, more turns - increased voltage
Lower temperature - increased voltage
And try this link:
http:/
RE: Magnetic Sensors
The barrel is roughly 30ft and the environment in the barrel is such that a Hall Effect Sensor would probably not survive.
Brian
Pro/E Mechanical Design & Checking
Aerospace and Defense
Florida, USA
RE: Magnetic Sensors
Given the structure, one might think that it has a resonant frequency, and an excitation at that frequency would show the greatest impedance change.
TTFN
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RE: Magnetic Sensors
TTFN
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RE: Magnetic Sensors
Thanks for your all your inputs.
Brian
Pro/E Mechanical Design & Checking
Aerospace and Defense
Florida, USA
RE: Magnetic Sensors
RE: Magnetic Sensors
Brian
Pro/E Mechanical Design & Checking
Aerospace and Defense
Florida, USA
RE: Magnetic Sensors
TTFN
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