Browse Prior Art Database

Polar Graphing on a Cartesian Recorder

IP.com Disclosure Number: IPCOM000044400D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Wheeler, GL: AUTHOR

Abstract

A fixture is provided to receive a magnetic element 2 such as a magnetic roll, for development or cleaning in an electrophotographic process. It is desired to generate a polar plot of the magnetic field strength around this roll. The fixture consists of a suitable drive, such as a motor 1 to rotate the magnetic element 2 at an appropriate speed for graphing. Directly attached to the magnetic element is an angle encoding potentiometer 6 producing two outputs, sin R and cos R, where R is the angle of rotation. Also provided is means to position the sensing probe 3 relative to the magnetic element. The gaussmeter 4 provides an output proportional to the sensed magnetic field strength, with the magnetic polarity being indicated by the gaussmeter output polarity.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 73% of the total text.

Page 1 of 2

Polar Graphing on a Cartesian Recorder

A fixture is provided to receive a magnetic element 2 such as a magnetic roll, for development or cleaning in an electrophotographic process. It is desired to generate a polar plot of the magnetic field strength around this roll. The fixture consists of a suitable drive, such as a motor 1 to rotate the magnetic element 2 at an appropriate speed for graphing. Directly attached to the magnetic element is an angle encoding potentiometer 6 producing two outputs, sin R and cos R, where R is the angle of rotation. Also provided is means to position the sensing probe 3 relative to the magnetic element. The gaussmeter 4 provides an output proportional to the sensed magnetic field strength, with the magnetic polarity being indicated by the gaussmeter output polarity. This signal is linear rectified
(5) to extract the magnitude and remove the sign. This magnitude is one element of the polar coordinate and the second element is the mechanical angle. The polar coordinates are applied to the encoding potentiometer. An inverse magnitude is automatically generated by inverter 7 and the potentiometer for plotting in the third and fourth quadrants. To use a cartesian recorder the polar coordinates must be converted to cartesian coordinates according to the equations: X=M cos R and Y=M sin R, where X and Y are the cartesian coordinates, and M and R are the magnitude and angle of the polar coordinates. The potentiometer 6, as applied here, is...