Method and apparatus to calibrate intensity and determine fringe

Details Method and apparatus to calibrate intensity and determine fringe Method and apparatus to calibrate intensity and determine fringe

1993-12-21

1995-10-10

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356359, G01B 902

Patent

active

054575346

ABSTRACT:
The apparatus and method for measuring a small spacing down to contact uses an interferometric fringe intensity calibration to calibrate maximum and minimum intensity of two or more monochromatic or quasi-monochromatic interference patterns caused by a spacing between two articles, one of which is transparent. The intensity calibration is done by measuring maximum and minimum fringe intensity of each color while altering the spacing by at least 1/4 of the wavelength of the light or other electromagnetic radiation being used. The calibration by changing spacing allows the fringe order to be calculated for each wavelength of the radiation being used. This calibration procedure allows the maximum and minimum intensity of the radiation to be known, as well as the fringe order of the interference patterns to be calculated. With the maximum and minimum intensities and the fringe orders known, the spacing is readily calculated from interferometric theory.

REFERENCES:
patent: 4293224 (1981-10-01), Gaston et al.
patent: 4593368 (1986-06-01), Fridge et al.
patent: 4627733 (1986-12-01), Wada
patent: 4630926 (1986-12-01), Tanaka et al.
patent: 4639139 (1987-01-01), Wyant et al.
patent: 4650330 (1987-03-01), Fujita
patent: 4832489 (1989-05-01), Wyant et al.
patent: 4931630 (1990-06-01), Cohen et al.
patent: 4948251 (1990-08-01), Kondo
patent: 5028136 (1992-07-01), Murarka et al.
patent: 5101111 (1992-03-01), Kondo
patent: 5218424 (1993-06-01), Sommargren
patent: 5285252 (1994-02-01), Vareille et al.
G. L. Best et al.; "Precise Optical Measurements of Slider Dynamics"; IEEE Transactions on Magnetics, vol. MAG-22, No. 5, Sep. 1986, pp. 1017-1018.
T. Ohkubo et al.; "Accurate Measurement of Gas-lubricated Slider Bearing Separation Using Visible Laser Interferometry"; Journal of Tribology Transactions of the ASME, Oct. 1987, pp. 1-6.
D. L. Lipschutz; "Dynamic Measurement of Small Separations by a Light Interference Method"; IEEE: Proceedings of the International Conference on Magnetic Recording, London, Jul. 1964, pp. 87-90.
W. N. Hansen; "Electric Fields Produced by the Propagation of Plane Coherent Electromagnetic Radiation in a Stratified Medium"; Journal of the Optical Society of America, vol. 58, No. 3, Mar. 1968, pp. 380-390.
K. Tanaka et al.; "Measurements of Transient Motion of Magnetic Disk Slider"; IEEE Transactions on Magnetics, vol. MAG-20, No. 5, Sep. 1984, pp. 924-926.
J. M. Fleischer et al.; "Infrared Laser Interferometer for Measuring Air-Bearing Separation"; IBM J. Res. Develop., Nov. 1974, pp. 529-533.
A. Nigam; "A Visible Laser Interferometer for Air Bearing Separation Measurement to Submicron Accuracy"; Journal of Lubrication Technology, Transactions for the ASME; vol. 104, Jan. 1982, pp. 60-65.
Y. Mizoshita et al., "Dynamic Characteristics of a Magnetic Head Slider"; IEEE Transactions on Magnetics; vol. MAG-21, No. 5, Sep. 1985, pp. 1509-1511.
C. Lin; "Techniques for the Measurement of Air--Bearing Separation--A Review"; IEEE Transactions on Magnetics, vol. MAG-9, No. 4, Dec. 1973, pp. 673-677.
C. Lin et al.; "An Application of White Light Interferometry in Thin Film Measurements"; IBM J. Res. Dev. May 1972, pp. 269-276.
G. L. Best; "Comparison of Optical and Capacitive Measurements of Slider Dynamics"; IEEE Transactions on Magnetics, vol. MAG-23, No. 5, Sep. 1987, pp. 3453-3455.
S. Yamamoto et al.,; "Real Time Observation of Head--To--Medium Interface in Flexible Perpendicular Magnetic Recording Disc System"; publication and date unknown.
Sales Brochure; ProQuip FM8801; publication date unknown.
Sales Brochure; PPL Automatic Digital Flying Height Tester; publication date unknown.
Y. Mizoshita et al.; "Dynamic Characteristics of a Magnetic Head Slider"; IEEE Transactions on Magnetics, vol. MAG-21, No. 5, Sep. 1985, pp. 1509-1511.
M. Mizukawa et al.; "Study on Spherical Foil Bearing"; Bulletin of JSME, vol. 28, No. 243, Sep. 1985, pp. 2105-2111.
Sales Brochure; Dynamic Flying Height Tester; Phase Metrics; 6 pages; publication date unknown.
C. Lacey et al.; "A New Method for Measuring Flying Height Dynamically"; Phase Metrics; 1992, pp. 1-16.

Affiliated with

Also associated with

Rating

Method and apparatus to calibrate intensity and determine fringe does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus to calibrate intensity and determine fringe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus to calibrate intensity and determine fringe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2314023