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The type of magnetometer I have the plans for are a differential proton precession magnetometer. The "sensors" are 2 inductors wound around 2 bottles filled with distilled water. The coils are energized to align the protons, and then the coils are de-energized. The coils are then switched into an oscillator circuit. If there is no magnetic anomaly, then you will just hear a steady decaying tone. If there is a pertibation in the magnetic field, the coil closest to the pertibation will very ever so slightly in inductance and you will get a beat frequency between the two. The sensitivity is a function of the spacing of the coils and in the case of marine use, these are usually towed in a tow fish configuration. To increase the spacing, Dalton suggests using a tow fish in addition to a surface mounted coil on the boat. These types of magnetometers are generally much more sensitive than fluxgate. If you have anymore questions, I will have to dig up my documentation. >>Posted on 21 Oct 1996 at 12:24:52 by Alan D. Secor > >>Harold, I purchased a set of plans from the address below but have not yet > >>built it. One of many projects for this winter, including building an ROV >>and finishing up a 1 ATM 2-man sub I have. Anyway, the plans are very similar >>to M.L. Dalton's design. He usually has a booth at DEMA. (Dalton that is). > >May I ask what they use for sensor and what range (distance from >the sensor) the device in question has ? > >Thanks, >John >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > -- Al Secor secor@bt*.ib*.co* ARS: WA3PWX SSI/PDIC Instructor DCSI5828 PDIC10750
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