ULTRASONIC MEASUREMENT AND CONTROL OF SURFACE ROUGHNESS

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$50,000.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
7518
Agency Tracking Number:
7518
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
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
THOMAS S JONES
() -
Business Contact:
() -
Research Institute:
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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