Apparatus and methods for maintaining a substantially constant t

Details Apparatus and methods for maintaining a substantially constant t Apparatus and methods for maintaining a substantially constant t

1996-11-21

1998-05-19

Dombroske, George M.

Measuring and testing

Surface and cutting edge testing

374 5, 374 7, 374120, 374137, 374141, 374164, G01N 2572, B23Q 1709

Patent

active

057538034

ABSTRACT:
Apparatus and methods for improved thermal proximity imaging are provided. A data storage medium surface is moved relative to a sensor, in one embodiment a magnetoresistive read/write element. Topographical variations on the storage medium induce temperature changes in the sensor. These temperature changes are monitored to detect the location and nature (e.g., height) of the topographical variations on the medium surface. A feedback circuit using an impedance bridge is disclosed for sensing instantaneous changes in the temperature of the sensor, correcting for the changes and, therefore, keeping the temperature of the sensor substantially constant. By keeping the temperature of the sensor constant, the topographical variations can be detected without any adverse impacts of the surrounding thermal environment on the detection response time.

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