07751062 cites 6 patents.

A method for optical flying height measurement, and a flying height tester. The method the method comprises the steps of aligning a first slider and a second slider adjacent a transparent disk; varying a rotational speed of the disk relative to the first slider whereby a spacing between the first slider and the disk changes; measuring changes in a first reflected light intensity caused by interference of a light signal portion reflected from the first slider and a light signal portion reflected from a surface of the disk, wherein the rotational speed is varied over a range such that one maximum and minimum intensities pair is measured in the reflected light intensity; measuring a second reflected light intensity caused by interference of a light signal portion reflected from the second slider and a light signal portion reflected from a surface of the disk at a fixed rotational speed between the disk and the second slider; and calculate a flying height of the second slider using the measured maximum and minimum intensities pair and the measured second reflected light intensity.

Title
Optical flying height measurement and calibration with dual sliders
Application Number
12/97224
Publication Number
7751062 (B2)
Application Date
December 12, 2006
Publication Date
July 6, 2010
Inventor
Ka Wei Ng
Singapore
SG
Zhimin Yuan
Singapore
SG
Bo Liu
Singapore
SG
Agent
Greenberg Traurig
Franklin D Ubell
Assignee
Agency for Science Technology and Research
SG
IPC
G01B 9/02
View Original Source