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elanya at 09:16pm on 20/09/2004
elanya at 09:16pm on 20/09/2004I just wanted to share this all with you, so you will understand why I *love* this theory class so muc!
Magnetic Tape Recording
One of the new graphic recorder developments is the ability to record sonar data on magnetic tape and then play it back again on the graphic recorder. This presented a number of interesting and difficult technical challenges. The graphic recorder helix drum is a high inertia load for the helix motor which turns the drum. It is also a load with widely varying torque and a large spread in the speeds required for the different sonar ranges. Yet the drum must turn at a precision constant rate in order to keep the quality of the sonar images. We used a printed circuit motor, an optical tachometer, and a precision crystal oscillator as a frequency source combined with a highly sophisticated phase-lock loop and a special power driver for the motor....
1998 Klein, M. "New Capabilities ofr Side-Scan Sonar" in Maritime Arcaheology: A Reader of Substantive and Theoretical Contributions. Babits and Tilburg, Plenum Press, New York.
Magnetic Tape Recording
One of the new graphic recorder developments is the ability to record sonar data on magnetic tape and then play it back again on the graphic recorder. This presented a number of interesting and difficult technical challenges. The graphic recorder helix drum is a high inertia load for the helix motor which turns the drum. It is also a load with widely varying torque and a large spread in the speeds required for the different sonar ranges. Yet the drum must turn at a precision constant rate in order to keep the quality of the sonar images. We used a printed circuit motor, an optical tachometer, and a precision crystal oscillator as a frequency source combined with a highly sophisticated phase-lock loop and a special power driver for the motor....
1998 Klein, M. "New Capabilities ofr Side-Scan Sonar" in Maritime Arcaheology: A Reader of Substantive and Theoretical Contributions. Babits and Tilburg, Plenum Press, New York.
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Well, I can mostly follow it, it is just that this is supposed to be a *theory* class that gets me.
I have no idea what a tachometer is though. Optical or otherwise.
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Cool stuff, but you're right. Not all that theoretical in some respects.
What f00dave said. It's that thing on your dash that measures RPMs for your car, for example. Optical just means it uses optics to do the measurement.