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Title: Interfacial force sensor with force-feedback control

Abstract

A new interfacial force microscope capable of measuring the forces between two surfaces over the entire range of surface separations, up to contact, has been developed. The design is centered around a differential capacitance displacement sensor where the common capacitor plate is supported by torsion bars. A force-feedback control system balances the interfacial forces at the sensor, maintaining the common capacitor plate at its rest position. This control eliminates the instability which occurs with the conventional cantilever-based force sensors when the attractive force gradient exceeds the mechanical stiffness of the cantilever. The ability to measure interfacial forces at surface separations smaller than this instability point using the feedback control is demonstrated. 11 refs., 3 figs.

Authors:
; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
Sponsoring Org.:
DOE/DP
OSTI Identifier:
6226235
Report Number(s):
SAND-90-2558C; CONF-901244-3
ON: DE91004897
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: 1990 international electron device conference, San Francisco, CA (USA), 10-12 Dec 1990
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 47 OTHER INSTRUMENTATION; SURFACE FORCES; MEASURING METHODS; CAPACITORS; CONTROL SYSTEMS; DESIGN; FEEDBACK; INTERFACES; MEASURING INSTRUMENTS; MICROSCOPES; PERFORMANCE TESTING; ELECTRICAL EQUIPMENT; EQUIPMENT; TESTING; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-); 440800 - Miscellaneous Instrumentation- (1990-)

Citation Formats

Joyce, S A, Houston, J E, and Smith, B K. Interfacial force sensor with force-feedback control. United States: N. p., 1990. Web.
Joyce, S A, Houston, J E, & Smith, B K. Interfacial force sensor with force-feedback control. United States.
Joyce, S A, Houston, J E, and Smith, B K. 1990. "Interfacial force sensor with force-feedback control". United States. https://www.osti.gov/servlets/purl/6226235.
@article{osti_6226235,
title = {Interfacial force sensor with force-feedback control},
author = {Joyce, S A and Houston, J E and Smith, B K},
abstractNote = {A new interfacial force microscope capable of measuring the forces between two surfaces over the entire range of surface separations, up to contact, has been developed. The design is centered around a differential capacitance displacement sensor where the common capacitor plate is supported by torsion bars. A force-feedback control system balances the interfacial forces at the sensor, maintaining the common capacitor plate at its rest position. This control eliminates the instability which occurs with the conventional cantilever-based force sensors when the attractive force gradient exceeds the mechanical stiffness of the cantilever. The ability to measure interfacial forces at surface separations smaller than this instability point using the feedback control is demonstrated. 11 refs., 3 figs.},
doi = {},
url = {https://www.osti.gov/biblio/6226235}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}

Conference:
Other availability
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