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in creator/contributor: "Cernosek, Richard W."

open access

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

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: Article

Partner: UNT Libraries Government Documents Department

open access

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

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: 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

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: Article

Partner: UNT Libraries Government Documents Department

open access

Love-Wave Biosensors Using Cross-Linked Polymer Waveguides on LiTaO{sub 3} Substrates

The design and performance of Love-wave sensors using cross-linked poly-(methyl methacrylate) waveguides of thickness of 0.3--3.2 {micro}m on LiTaO{sub 3} substrates are described. It is found that this layer-substrate combination provides sufficient waveguidance, and electrical isolation of the IDTs from the liquid environment to achieve low acoustic loss and distortion. In bio-sensing experiments, mass sensitivity up to 1,420 Hz/(ng/mm{sup 2}) is demonstrated.

Date: July 13, 2000

Creator: BENDER,FLORIAN; CERNOSEK,RICHARD W. & JOSSE,F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Detection of Volatile Organics Using a Surface Acoustic Wave Array System

A chemical sensing system based on arrays of surface acoustic wave (SAW) delay lines has been developed for identification and quantification of volatile organic compounds (VOCs). The individual SAW chemical sensors consist of interdigital transducers patterned on the surface of an ST-cut quartz substrate to launch and detect the acoustic waves and a thin film coating in the SAW propagation path to perturb the acoustic wave velocity and attenuation during analyte sorption. A diverse set of mate… more

Date: October 14, 1999

Creator: Anderson, Lawrence F.; Bartholomew, John W.; Cernosek, Richard W.; Colburn, Christopher W.; Crooks, R. M.; Martinez, R. F. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Modeling the responses of TSM resonators under various loading conditions

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: Report

Partner: UNT Libraries Government Documents Department