Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1997-02-07
1998-09-08
Kim, Robert
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356360, G01B 902
Patent
active
058052844
ABSTRACT:
An efficient method and apparatus for taking the data needed for a glide test; the data includes measuring flying height of a slider over a regular rotating disk and measuring piezoelectric contact with the disk. An optical system provides a beam of light. To measure the flying height, part of the beam of light is reflected from a surface of the transparent slider. Another portion of the beam is reflected from the surface of a rotating disk. The two beams are transferred through an optical system and imaged onto a CCD camera which converts the separation of intensity maxima or intensity minima into information regarding the air gap separating the slider and the disk. A piezoelectric sensor on the slider measures slider contact with the disk. A processor combines data from the piezoelectric sensor with data from the CCD camera to measure disk asperities.
REFERENCES:
patent: 5457534 (1995-10-01), Lacey et al.
patent: 5504571 (1996-04-01), Eckerman et al.
patent: 5581021 (1996-12-01), Flechsig et al.
Kim Robert
Phase Metrics, Inc.
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