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    Re: Fluxgate compass /low end US vendor
    From: George Huxtable
    Date: 2002 Feb 1, 15:47 +0000

    Brian Whatcott says-
    >The low end of the market for a 3 axis magnetic sensor plus pitch and roll
    >detection is probably this board level OEM module from Precision Navigation
    >The tcm2-50  at  $770, still is not bargain priced - and the magnetic
    >sensors are not exactly flux gates, and the high dollar strap-down
    >rate-sensors and acceleration sensors are replaced by two "electrolytic"
    >inclinometers which read out pitch and roll to +/- 50 degrees, but this is
    >a step in the right direction, I'd think.
    George Huxtable replies-
    Now that Brian is referring to "the high dollar strap-down rate-sensors and
    acceleration sensors", it seems we are starting to agree about the
    components that are really needed to put together a good fluxmeter for
    surface use.
    But I doubt if the instrument he refers to will take us even part of the
    way there.
    I presume (and please, someone correct me if I have it wrong) that an
    "electrolytic" inclinometer uses a conductive liquid in a U-tube, with
    electrical (or capacitive) connections making up two arms of a Wheatstone
    bridge to detect departures from the level. Or something on those lines. If
    so, this has exactly the same limitations as any other gravity-sensor when
    it goes to sea. It's just as sensitive to the disturbances caused by the
    sea-state accelerations. It will do no better than a damped gimbal or
    pendulum or a 3-axis accelerometer.
    So I expect that this instrument will suffer from the same limitations as
    the others, in rough weather.
    George Huxtable.
    George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    Tel. 01865 820222 or (int.) +44 1865 820222.

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