公开(公告)号：AU750725B2

公开(公告)日：2002-07-25

申请号：AU8569598

申请日：1998-07-15

Applicant: STEVENS INST TECHNOLOGY

Inventor： DONSKOY DIMITRI M ,  SUTIN ALEXANDER M

IPC: F41H11/12 ,  G01N29/00 ,  G01N29/11 ,  G01N29/28 ,  G01N29/40 ,  G01N29/46 ,  G01N29/48 ,  G01S13/88 ,  G01S15/02 ,  G01S15/04 ,  G01S15/88 ,  G01V1/00 ,  G01V3/12

Abstract: A device (10) which employs an acoustic signal having one or more frequencies for penetrating into ground, water, or sediments and vibrating a compliant buried object (8) is provided. When these acoustic signals encounter an acoustically compliant object (8) such as a mine, the acoustic signals vibrate the compliant object (8), leading to a vibration of the compliant object (8) against the boundaries of the surrounding medium such as ground sediment, creating a nonlinear distortion of the probing signal including the generation of harmonics and acoustic waves with combination frequencies (nonlinear signals). These nonlinear vibrating signals are received from the surface by a sensor (20). The amplitude of the measured nonlinear signals indicates the presence of an acoustically compliant object (8) such as a mine. The present invention also relates to a method and apparatus which emits an electromagnetic RF probing signal and acoustic or vibration signal (modulating signal), detects the reflected electromagnetic signal from the buried object (8), and processes the received signal, identifying the modulation caused by vibration.

公开(公告)号：AU4322402A

公开(公告)日：2002-06-24

申请号：AU4322402

申请日：2001-11-16

Applicant: STEVENS INST TECHNOLOGY

Inventor： DONSKOY DIMITRI ,  SHEPPARD KEITH

IPC: B06B1/02 ,  B06B1/06 ,  G10K11/34

Abstract: A large aperture, high spatial resolution vibration and acoustic sensing device is provided. The sensor is capable of directional resolution of acoustic sources in gaseous, liquid, and solid media, and can be employed as a directional microphone or a directional hydrophone. The sensor can also be used as a high-resolution vibration displacement sensor. The device is formed of thin films comprising two electret layers and a compliant intermediate layer disposed therebetween. Conductive coatings disposed on the electret layers can be patterned and etched to provide a plurality of discrete sensing elements, forming a directional array. The sensor can be transparent, thereby allowing usage as a large area microphone disposed on top of a computer screen, video monitor, windows, or walls.

公开(公告)号：CA2383350A1

公开(公告)日：2001-03-01

申请号：CA2383350

申请日：2000-08-23

Applicant: STEVENS INST TECHNOLOGY

Inventor： SEDUNOV NIKOLAY ,  WHITTAKER EDWARD A ,  DONSKOY DIMITRI

IPC: G01H9/00 ,  G01N29/24 ,  G01N29/34 ,  G01N29/44 ,  G01N29/50 ,  G01B9/02 ,  G01H13/00 ,  G01N29/12

Abstract: A method and apparatus (10) is provided which employs phase or amplitude modulated electromagnetic probing waves (20) (in optical or microwave frequency ranges or both) emitted toward a vibrating object (8). The optical and/or microwave probing signals (20) remotely irradiate an object (8) of interest. The object (8) reflects and/or scatters the probing wave (20) towa rd a receiver (22). The reflected/scattered modulated signal (24) is received with a remote sensor (receiver) (22). Vibration causes additional phase modulation to the probing wave (20). At the receiving end, the signal is demodulated to extract and analyze the vibration waveform (26, 28). The present invention can be utilized for nondestructive testing, monitoring of technological processes, structural integrity, noise and vibration control, mine detection, etc.

公开(公告)号：AU2572299A

公开(公告)日：1999-08-16

申请号：AU2572299

申请日：1999-01-29

Applicant: STEVENS INST TECHNOLOGY

Inventor： DONSKOY DIMITRI M ,  SUTIN ALEXANDER M

IPC: G01N29/04 ,  G01N29/12 ,  G01H13/00 ,  G01H9/00

Abstract: The invention relates to a method and apparatus for nondestructive testing and evaluation of materials and mechanical structures to determine their integrity reducing contact-type flaws such as cracks, fractures, delamination, unbondings, etc. and also presence of ice on a structure. The invention employs an ultrasonic probing signal and a low frequency vibration applied to a structure tested. In a structure without flaws or ice, these signals propagate independently without any interaction. If the structure contains a defect or ice thereon, the vibration varies the contact area of the defect or ice/structure interface, modulating the phase and amplitude of the higher frequency ultrasonic probing signal passing through the structure. In the frequency domain the result of this modulation manifests itself as sideband spectral components with respect to frequency of the probe wave. This can be considered as a new signal generated by a defect, so that the defect can be detected more easily when such a signal is observed. There are three modes of detection including, vibro-modulation, impact-modulation and self-modulation. The location of defects can be determined in two modes. In a first mode defect is located by moving the low frequency signal about the structure and triggering the high frequency signal immediately after the low frequency signal. Defects can be located in a second mode with a sequence of short burst high frequency signal and a signal-processing algorithm which selects the sequences reflected from various areas of the tested structure. A defect can be quantitatively analyzed by sweeping the high frequency signal over a defined frequency range and measuring, averaging and normalizing the amplitudes of the side bands.

公开(公告)号：CA2319478A1

公开(公告)日：1999-08-05

申请号：CA2319478

申请日：1999-01-29

Applicant: STEVENS INST TECHNOLOGY

Inventor： SUTIN ALEXANDER M ,  DONSKOY DIMITRI M

IPC: G01N29/04 ,  G01N29/12 ,  G01H9/00 ,  G01H13/00

Abstract: The invention relates to a method and apparatus for nondestructive testing and evaluation of materials and mechanical structures to determine their integrity reducing contact-type flaws and presence of ice on a structure. The invention employs an ultrasonic probing signal (30) and a low frequency vibration (20) applied to a structure (8) tested. In a structure without flaws or ice, these signals propagate independently without any interaction. If the structure contains a defect or ice thereon, the vibration varies the contact area of the defect or ice/structure interface, modulating the phase and amplitude of the higher frequency ultrasonic probing signal passing through the structure (8). In the frequency domain the result of this modulation manifests itself as sideband spectral components with respect to frequency of the probe wave. This can be considered as a new signal generated by a defect, so that the defect can be detected more easily when such a signal is observed.

公开(公告)号：CA2296510C

公开(公告)日：2006-02-07

申请号：CA2296510

申请日：1998-07-15

Applicant: STEVENS INST TECHNOLOGY

Inventor： SUTIN ALEXANDER M ,  DONSKOY DIMITRI M

IPC: G01V3/00 ,  F41H11/12 ,  G01N29/00 ,  G01N29/11 ,  G01N29/28 ,  G01N29/40 ,  G01N29/46 ,  G01N29/48 ,  G01S13/06 ,  G01S13/32 ,  G01S13/88 ,  G01S15/02 ,  G01S15/04 ,  G01S15/74 ,  G01S15/88 ,  G01V1/00 ,  G01V3/12

Abstract: A device (10) which employs an acoustic signal having one or more frequencies for penetrating into ground, water, or sediments and vibrating a compliant buried object (8) is provided. When these acoustic signals encounter an acoustically compliant object (8) such as a mine, the acoustic signals vibrate the compliant object (8), leading to a vibration of the compliant object (8) against the boundaries of the surrounding medium such as ground sediment, creating a nonlinear distortion of the probing signal including the generation of harmonics and acoustic waves with combination frequencies (nonlinear signals). These nonlinear vibrating signals are received from the surface by a sensor (20). The amplitude of the measured nonlinear signals indicates the presence of an acoustically compliant object (8) such as a mine. The present invention also relates to a method and apparatus which emits an electromagnetic RF probing signal and acoustic or vibration signal (modulating signal), detects the reflected electromagnetic signal from the buried object (8), and processes the received signal, identifying the modulation caused by vibration.

公开(公告)号：MXPA02005991A

公开(公告)日：2004-04-05

申请号：MXPA02005991

申请日：2000-12-15

Applicant: STEVENS INST TECHNOLOGY

Inventor： KORFIATIS GEORGE P

IPC: B01J19/08 ,  H05H1/24 ,  F41B6/00 ,  G01N21/73

Abstract: Se describe un reactor de plasma (100) que incluye una primera dielectrica (115) que tiene por lo menos un capilar (146) definido a traves de la misma, y un electrodo segmentado (140) incluyendo una pluralidad de segmentos de electrodo (140), cada segmento de electrodo (140) esta dispuesto cerca de un capilar asociado (146). El reactor 100 puede incluir un segundo electrodo (120) y una dielectrica con las primera y segunda dielectricas (115) separadas a una distancia predeterminada para formar un canal (125) entre ellas, en donde el plasma que sale de los capilares (146) en l a primera dielectrica (115) es descargado. El fluido que ser tratado se hace pasar a traves del canal (125) y queda expuesto a la descarga del plasma. El fluido que sera tratado puede ser expuesto a la descarga de plasma tanto en los capilares (146) como en el canal (125) entre las dos dielectricas (115). El reactor de plasma (100) tiene una amplia variedad de aplicaciones, tales como la destruccion de contaminantes en un fluido, la generacion de ozono, el pre- tratamiento de aire para modificar o mejorar la combustion, y la destruccion de varios compuestos organicos, y limpieza de la superficie de objetos.

公开(公告)号：CA2462614A1

公开(公告)日：2003-08-07

申请号：CA2462614

申请日：2002-11-04

Applicant: PLASMASOL CORP ,  STEVENS INST TECHNOLOGY

Inventor： CROWE RICHARD ,  BABKO-MALYL SERGEI ,  KORFIATIS GEORGE P

IPC: A61L2/00 ,  A61L2/14 ,  A61L9/16 ,  A61L9/22 ,  B03C3/017 ,  F24F3/16 ,  H01T19/00 ,  H05H1/24

Abstract: A sterilization and decontamination system in which a non-thermal plasma discharge device is disposed upstream of a suspension media (e.g., a filter, electrostatic precipitator, carbon bed). The plasma discharge device generat es a plasma that is emitted through apertures (e.g., capillaries or slits) in t he primary dielectric. Plasma generated active sterilizing species when exposed to contaminants or undesirable particulate matter is able to deactivate or reduce such matter in contaminated fluid stream and/or on objects. Thus, the undesirable contaminants in the fluid to be treated are first reduced during their exposure to the plasma generated active sterilizing species in the plasma region of the discharge device. Furthermore, the plasma generated active sterilizing species are carried downstream to suspension media and up on contact therewith deactivate the contaminants collected on the suspension media itself. Advantageously, the suspension media may be cleansed in situ. To increase the sterilization efficicency an additive, free or carrier gas (e.g ., alcohol, water, dry air) may be injected into the apertures defined in the primary dielectric. These additives increase the concentration of plasma generated active sterilizing agents while reducing the byproduct of generate d undesirable ozone pollutants. Downstream of the filter the fluid stream may be further treated by being exposed to a catalyst media or additional suspensio n media to further reduce the amount of undesirable particulate matter.

公开(公告)号：CA2221873A1

公开(公告)日：1997-01-09

申请号：CA2221873

申请日：1996-06-20

Applicant: STEVENS INST TECHNOLOGY

Inventor： DONSKOY DIMITRI

IPC: A61B5/103

公开(公告)号：DE202014101512U1

公开(公告)日：2014-07-07

申请号：DE202014101512

申请日：2014-03-31

Applicant: STEVENS INST TECHNOLOGY

IPC: G09B5/06

Abstract: Automatisierte Unterrichts-Vorrichtung, um Nutzer in Problemlösungstechniken zu unterrichten, wobei die Vorrichtung folgendes aufweist: einen Computer mit einprogrammierter Unterrichts-Software, die ausgelegt ist, ein Problem, das als Problemstellung dargestellt ist, einem Nutzer darzustellen und dem Nutzer zu ermöglichen, das Problem zu lösen, wobei der Computer die Problemstellung dem Nutzer unter programmatischer Kontrolle auf einem Bildschirm darstellt, wobei der Computer einen Eingabemechanismus aufweist, der dem Nutzer ermöglicht, einen Teil der Problemstellung auszuwählen, wobei das Programm dem Nutzer ermöglicht, Aktionen bezüglich des ausgewählten Teils auszuführen, die zu einer Verarbeitung des ausgewählten Teils führen, und wobei das Programm ausgelegt ist, einen darauf folgenden Zustand des ausgewählten Teils als veränderte Problemstellung auf dem Bildschirm darzustellen, wobei die Problemstellung und die veränderte Problemstellung Knotenpunkte auf einem durch den Nutzer definierten Lösungsweg darstellen, wobei der programmierte Computer ausgelegt ist, dem Nutzer zu ermöglichen, Problemstellungen auszuwählen und zu bearbeiten, bis der Nutzer anzeigt, dass er den Nutzerspezifischen Lösungsweg abgeschlossen hat, wobei der Computer Zugang zu gespeicherten Daten hat, welche die Problemstellung beinhalten und zu Daten hat, welche einen richtigen Problemlösungsweg definieren und die zumindest einen Knotenpunkt zusätzlich zu der Problemstellung aufweisen, und wobei der Computer die Aktionen, die vom Nutzer bei dem Versuch der Lösung des Problems ausgeführt wurden überprüft, und auswertet, ob die Aktionen richtig oder falsch waren.