ULTRASONIC MEASUREMENT AND CONTROL OF SURFACE ROUGHNESS

Award Information
Agency: National Science Foundation
Branch: N/A
Contract: N/A
Agency Tracking Number: 7518
Amount: $50,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1988
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
15215 Shady Grove Road, Suite 203, Rockville, MD, 20850
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 THOMAS S JONES
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE AMPLITUDE OF ULTRASOUND REFLECTED OR SCATTERED FROM A SOLID SURFACE IN A FLUID DEPENDS ON THE RELATIVE ACOUSTIC IMPEDANCES OF THE MEDIA AND ALSO ON THE SURFACE ROUGHNESS OFTHE SOLID. A VERY SMOOTH SURFACE WILL TEND TO REFLECT A HIGHER ULTRASONIC AMPLITUDE THAN A ROUGH ONE. A ROUGH SURFACE WILL LEAD TO SIGNIFICANT SCATTER INTENSITY, MEASUREMENTS OF ULTRASONIC REFLECTIVITY AND SCATTER, THEREFORE, MAY BE USED TO DETERMINE SURFACE ROUGHNESS AND TO MONITOR ROUGHNESS WHILE A MATERIAL IS BEING MACHINED. THUS, ULTRASONIC MEASUREMENTS OFFER PROMISE FOR DYNAMIC (IN-PROCESS, REAL-TIME) MONITORING OF MACHINING PROCESSES TODETECT VARIATIONS IN SURFACE ROUGHNESS AND TO RELATE THE MEASUREMENTS TO WEAR OR BREAKAGE OF THE CUTTING TOOL. IN THIS PROGRAM WE PROPOSE TO MEASURE ULTRASONIC REFLECTION ANDSCATTER FROM METAL SURFACES WITH THREE DIFFERENT ROUGHNESS VALUES. THE MEASUREMENTS WILL BE DONE OVER A RANGE OF ULTRASONIC FREQUENCIES AND SCATTER ANGLES. THESE RESULTS WILL LEAD TO IMPROVED UNDERSTANDING AND A MODEL THAT WILL PROVIDE INSIGHT FOR THE DEVELOPMENT OF AN ULTRASONIC INSTRUMENT FOR DYNAMIC SURFACE ROUGHNESS MEASUREMENT AND FOR THE CONTROL OF MACHINING PROCESSES.

* Information listed above is at the time of submission. *

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