NDLI: Design and Use of a Laser Interferometer for Ultrasonic Bonding Studies

Content Provider	IEEE Xplore Digital Library
Author	Martin, Byron D.
Copyright Year	1976
Description	Author affiliation: IBM System Products Division, East Fishkill, Hopewell Junction, New York 12533 (Martin, Byron D.)
Abstract	An in-line laser interferometer was developed to study motions during ultrasonic bonding. The interferometer consists of a 2 milliwatt He-Ne laser with output mirrors at both ends, a lens with adjustment apparatus, and a photodiode detector. The detector output is displayed on an oscilloscope. The lens permits the beam to be focussed to a spot diameter less than 25 micrometers. The beam is focussed on a periodically moving target which results in a fringe pattern displayed on the oscilloscope. Peak-to-peak displacements up to 50 micrometers have been measured with an accuracy of ± 25 nanometers. The fringe pattern observed may be described in terms of a Michelson interferometer. The experimentally observed fringe pattern corresponds exactly to the theoretical plot using the Michelson interferometer. Peak-to-peak displacements are determined by counting the number of fringes on the oscilloscope.
Starting Page	82
Ending Page	85
File Size	4845326
Page Count	4
File Format	PDF
ISSN	07350791
DOI	10.1109/IRPS.1976.362725
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1976-04-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical design Bonding Laser beams Motion measurement Ultrasonic variables measurement Oscilloscopes Optical beam splitting Wires Length measurement Mirrors
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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