J. S. Schoenwald - Storming Media

MAR 89

38 pages

Authors: J. S. Schoenwald; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

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We describe the design, development, and performance of a microbend fiber optical domain reflectometry (OTDR) based distributed strains sensor. A test bed has been developed to evaluate and compare this system to conventional discrete strain gauge sensors. The test bed consists of an aluminum cantilever beam to which have been attached several pairs of strain gauges (for reference) and several microbend transducers. A single standard multi-mode optical fiber is threaded ...

exploiting solid state ultrasonic motors for robotics

Authors: J. S. Schoenwald; P. M. Beckham; r. a. rattner; b. vanderlip; b. e. shi

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in this paper, we have described the design and implementation of a small parallel jaw gripper driven by a resonant structure ultrasonic motor. the motor is capable of generating 10 oz of force in linear motion and has a static holding force greater than 10 oz in the power off state due to the high friction nature of the design. the manipulator designed to exploit these properties is a precision ...

STRATEGIES FOR ROBOTIC SENSING USING ACOUSTICS

OCT 85

Authors: J. S. Schoenwald

robotics is an acknowledged critical component of present and future manufacturing methods. the competitive drive for still higher productivity is pressing robotics technology to provide machine intelligence capable of accurate, real-time adaptive behavior. sensing is considered a major component of machine intelligence. for manufacturing, repair and maintenance, a sense of touch, proximity and depth perception, traditionally considered uniquely human activities, are among the key requirements for any machine to emulate ...

Acoustic Imaging Systems (for Robotic Object Acquisition)

MAR 85

Authors: J. M. Richardson; J. F. Martin; K. A. Marsh; J. S. Schoenwald; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER

The long-term objective of the effort is to establish successful approaches for 3D acoustic imaging of dense solid objects in air to provide the information required for acquisition and manipulation of these objects by a robotic system. The objective of this first year's work was to achieve and demonstrate the determination of the external geometry (shape) of such objects with a fixed sparse array of sensors, without the aid of ...

ACOUSTIC IMAGING OF SOLID OBJECTS IN AIR USING A SMALL SET OF TRANSDUCERS

NOV 84

Authors: J. M. Richardson; K. A. Marsh; J. S. Schoenwald; J. F. Martin

we describe an algorithm that enables 3-dimensional acoustic imaging of simple objects in air using an array containing only a small number of transducers. each transducer provides a pulse-echo measurement in an appropriate incident direction. our probabilistic imaging procedure uses entire waveforms (i.e., they are not limited to simple time-of-flight measurement), and are based on the kirchhoff approximation together with the assumption that the scatterer is a rigid body. we ...

AN OPTICAL BOLT HOLE SCANNER

AUG 83

Authors: r. c. addison; J. S. Schoenwald

this paper describes an optical bolt hole scanning instrument built to examine a specimen containing a fatigue crack. the results, while not conclusive, establish that cracks of 0.015 in. length and less can be detected. (author/ntiac)

ACOUSTIC SCANNING FOR ROBOTIC RANGE SENSING AND OBJECT PATTERN RECOGNITION

OCT 82

Authors: J. S. Schoenwald; J. F. Martin; L. A. Ahlberg

intelligent task automation (i.e. robotics) requires comprehensive sensory data to guide manipulators in executing assembly and inspection processes. parallel sensor data processing can provide data compression and speed the scene analysis/controller decision task. acoustic scanning provides information about plane surface orientation, ranging and surface curvature not as readily obtained with optical image analysis techniques. in addition, acoustic scanning does not encounter false signal information due to specular reflection (hot spots) ...

uhf surface acoustic wave resonators

NOV 74

Authors: E. J. Staples; J. S. Schoenwald; r. c. rosenfeld; c. s. hartmann

surface acoustic wave (saw) filters have found widespread usage in the uhf frequency range, however, such usage has heretofore been confined to bandpass filtering via acoustic transmission from one transducer to another. a new surface wave device--the saw crystal resonator--is reported in this paper. utilizing photolithographic fabrication techniques and a planar geometry, crystal resonator technology may now be extended throughout the entire uhf frequency range. the surface wave crystal resonator ...

surface wave cavity and resonator characteristics-vhf to l-band

NOV 74

Authors: J. S. Schoenwald; r. c. rosenfeld; E. J. Staples

an equivalent circuit model representation of a surface acoustic wave resonator is described. a variety of devices are evaluated and found to be in excellent quantitative agreement with the model. yz linbo3 saw resonators with q's exceeding 3000 and similarly on quartz with q's in excess of 9000 have been achieved at frequencies ranging from 38 mhz to 860 mhz. electrostatic probe measurements determine the nature of the resonant cavity ...