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in creator/contributor: "MARTIN, STEPHEN J."  
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Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance

Description: A method, using a quartz crystal microbalance, to obtain simultaneous measurement of solid mass accumulation and changes in liquid density-viscosity product. The simultaneous real-time measurements of electrical parameters yields that changes in surface mass can be differentiated from changes in solution properties. Two methods to obtain the admittance/frequency data are employed.
Date: December 31, 1991
Creator: Granstaff, Victoria E. & Martin, Stephen J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Equivalent-Circuit Model for the TSM Resonator with a Viscoelastic Layer

Description: This paper describes a new equivalent-circuit model for the thickness shear mode resonator with a surface viscoelastic layer operating near film resonance. The electrical impedance of the film is represented by a simple three-element parallel circuit containing a resistor, a capacitor, and an inductor. These elements describe the film's viscous power dissipation, elastic energy storage, and kinetic energy storage, respectively. Resonator response comparisons between this lumped-element model an… more
Date: September 16, 1999
Creator: Bandey, Helen L.; Cernosek, Richard W.; Hillman, A. R. & Martin, Stephen J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

An Examination of System Architectures for Distributing Sensor Data Via Ethernet Networks

Description: Application of the World Wide Web (WWW) for the transfer of sensor data from remote locations to laboratories and offices is a largely ignored application of the WWW. We have investigated several architectures for this application including simple web server/client architectures and variations of this approach. In addition, we have evaluated several commercial approaches and other techniques that have been investigated and are in the literature. Finally, we have provided conclusions based on th… more
Date: January 2001
Creator: Pfeifer, Kent B.; Cernosek, Richard W.; Martin, Stephen J.; Waldschmidt, R. L. & Rumpf, A. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Equivalent-Circuit Model for the Thickness-Shear Mode Resonator with a Viscoelastic Film Near Film Resonance

Description: We derive a lumped-element, equivalent-circuit model for the thickness shear mode (TSM) resonator with a viscoelastic film. This modified Butterworth-Van Dyke model includes in the motional branch a series LCR resonator, representing the quartz resonance, and a parallel LCR resonator, representing the film resonance. This model is valid in the vicinity of film resonance, which occurs when the acoustic phase shift across the film is an odd multiple of {pi}/2 radians. This model predicts accurate… more
Date: September 16, 1999
Creator: Bandey, Helen L.; Brown, Mark J.; Cernosek, Richard W.; Hillman, A. Robert & Martin, Stephen J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling the responses of TSM resonators under various loading conditions

Description: The authors developed a general model that describes the electrical responses of thickness shear mode resonators subject to a variety of surface conditions. The model incorporates a physically diverse set of single component loadings, including rigid solids, viscoelastic media, and fluids (Newtonian or Maxwellian). The model allows any number of these components to be combined in any configuration. Such multiple loadings are representative of a variety of physical situations encountered in elec… more
Date: March 1, 1999
Creator: BANDEY,HELEN L.; MARTIN,STEPHEN J.; CERNOSEK,RICHARD W. & HILLMAN,A. ROBERT
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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