Acousto-Optics and Applications最新文献

{"title":"Acousto-optic switch for telecommunication networks","authors":"J. Sapriel, V. Molchanov, G. Aubin, S. Gosselin","doi":"10.1117/12.612841","DOIUrl":"https://doi.org/10.1117/12.612841","url":null,"abstract":"A detailed description of multichannel Bragg cells and their insertion in a versatile crossbar optical switch architecture is presented here. The cells utilize for the first time an acousto-optic scattering geometry in GaAs which displays advantageous characteristics in the design of a telecommunication spatial switch: low crosstalk and access delay, insensitivity to optical polarization, relatively low insertion losses.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"5828 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128754218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-excited 100-GHz localized acoustic modes in Au/V nanolayer structures","authors":"M. Aleksiejuk, T. Baczewski, B. Bonello, F. Rejmund","doi":"10.1117/12.612779","DOIUrl":"https://doi.org/10.1117/12.612779","url":null,"abstract":"This work presents analysis of localized acoustic modes using theory given by B. Djafari-Rouchani et al. and Rytov model of elastic waves propagation in periodical medium. Localized modes were considered for Au/V nanostructures. Experimentally Au/V nanostructures on MgO substrate with period 120-240 Å were studied. Changes of light reflectivity coefficient of these nanostructures caused by femtosecond laser beam excitation were measured. Analysis of experimental results of reflectivity dependence on delay time of probe beam was made over the range up to 150 ps. The dependences of localized modes frequency on thickness of nanostructure bilayers were obtained. Measured frequencies of localized modes remain in agreement to the theoretical values.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133729460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic properties of EMG-605 magnetic liquid","authors":"T. Hornowski","doi":"10.1117/12.612810","DOIUrl":"https://doi.org/10.1117/12.612810","url":null,"abstract":"The study of ultrasonic properties of water-based magnetic fluid EMG-605 is presented. The measurements of velocity and attenuation of ultrasound were carried out as a function of temperature, frequency, magnetic field strength and the angle between the wave and the direction of magnetic liquid. The model takes into account mutual interaction of magnetic clusters giving skeleton’s stiffness and interaction of clusters with free liquid producing attenuation and dispersion of waves for transversally isotropic system. A good agreement between experimental data and the predictions of theoretical model was obtained.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116125470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The pressure distribution for biharmonic transmitting array: theoretical study","authors":"A. Baranowska","doi":"10.1117/12.612809","DOIUrl":"https://doi.org/10.1117/12.612809","url":null,"abstract":"The aim of the paper is theoretical analysis of the finite amplitude waves interaction problem for the biharmonic transmitting array. We assume that the array consists of 16 circular pistons of the same dimensions that regrouped in two sections. Two different arrangements of radiating elements were considered. In this situation the radiating surface is non-continuous without axial symmetry. The mathematical model was built on the basis of the Khokhlov - Zabolotskaya - Kuznetsov (KZK) equation. To solve the problem the finite-difference method was applied. On-axis pressure amplitude for different frequency waves as a function of distance from the source, transverse pressure distribution of these waves at fixed distances from the source and pressure amplitude distribution for them at fixed planes were examined. Especially changes of normalized pressure amplitude for difference frequency were studied. The paper presents mathematical model and some results of theoretical investigations obtained for different values of source parameters.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126899829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The diffraction of ultrasound on corrugated surfaces and its possible application for surface wave stimulation","authors":"N. Declercq, R. Briers, J. Degrieck, O. Leroy","doi":"10.1117/12.612845","DOIUrl":"https://doi.org/10.1117/12.612845","url":null,"abstract":"This paper describes some achievements in the field of the diffraction of ultrasound on corrugated surfaces. Both single and double corrugated surfaces are considered. A demonstration of the capability of the inhomogeneous wave theory to simulate backward displacement of ultrasonic bounded beams (observed by Breazeale and Torbett, Appl. Phys. Let. 29(8), 456-458, 1976) has been demonstrated very recently [Nico F. Declercq, Joris Degrieck, Rudy Briers, Oswald Leroy, Appl. Phys. Let. 82(15), 2533-2534, 2003]. The current report applies the theory of the diffraction of inhomogeneous waves and shows how this theory is capable of simulating, explaining and understanding the experiments mentioned above. The theory reveals the existence of leaky Scholte - Stoneley waves, which is a novel phenomenon that was first reported from a theoretical point of view [Nico F. Declercq, Joris Degrieck, Rudy Briers, Oswald Leroy, J. Acoust. Soc. Am. 112(5), 2414, 2002] and was shortly after discovered experimentally [A.A. Teklu, M.A. Breazeale, J. Acoust. Soc. Am. 113(4), 2283-2284, 2003]. Moreover, the present paper shows that the classical Fourier decomposition of bounded beams is unable to simulate the backward beam displacement. This work also elucidates the nature of Wood anomalies in Diffraction spectra. Furthermore, it is known that singly corrugated surfaces have the ability to stimulate surface acoustic waves by means of diffraction. However, this diffraction occurs in a single plane. Sound impinging a doubly corrugated surface is scattered in many directions. Therefore, such surfaces possess the ability to generate surface waves in many directions, depending on the corrugation and depending on the frequency. Numerical simulation is possible if continuity of stress and strain is considered. The present paper reports advanced numerical simulations based on all physical parameters of the system and shows what surface waves are generated, under what conditions and under what angle. Such a device may be used to send surfaces in directions that are determined by their frequency.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129022954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feedback vibration control of circular plate interacting with fluid using piezoceramic controllers","authors":"L. Leniowska","doi":"10.1117/12.612808","DOIUrl":"https://doi.org/10.1117/12.612808","url":null,"abstract":"Active control of vibration suppression of a circular fluid-loaded plate is analytically studied. The purpose of this theoretical work is to present a general model of the response of a thin circular plate mounted to a frame with a metal collar. The model is based upon the geometry and properties of an experimental set-up consisting of a hard-walled cylinder with a thin plate at one end. The plate is excited on one side by a uniform periodic force with constant amplitude and radiating into free space. The system equations are formulated taking into account the coupling effect between structure and acoustic medium. The control problem lies in using piezoceramic actuators working in pair to control theory is then applied to the system model using a linear quadratic regulator (LQR). The feedback control is realized via circular piezoelectric ceramic elements glued to the central part of the plate.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"5828 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129008996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Schlieren photography as a great tool to study wave diffraction at the end of a plate","authors":"N. Declercq, A. Teklu, M. Breazeale, J. Degrieck, O. Leroy","doi":"10.1117/12.612764","DOIUrl":"https://doi.org/10.1117/12.612764","url":null,"abstract":"A study by means of the Schlieren technique for visualization of ultrasonic beams, has revealed that when leaky Rayleigh waves, propagating along the horizontal edge of a thick, fluid loaded solid plate, are scattered at the extremity of the plate, they travel around the corner and start leaking into the liquid along the Rayleigh angle measured from the normal to the vertical edge of the plate. Furthermore the study reveals that leaky Rayleigh waves are stimulated by the border of an incident ultrasonic bounded beam, more than by the interior of the beam. Comparison with an earlier work shows that the characteristics of the scattering of leaky Rayleigh waves at the edge of the plate is very different from that of Scholte - Stoneley waves.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116761267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zipf's law in photoacoustics, in nature, and in society","authors":"S. Egerev, A. Fokin","doi":"10.1117/12.614587","DOIUrl":"https://doi.org/10.1117/12.614587","url":null,"abstract":"Regularities in some complex systems can sometimes be expressed in terms of simple laws. A peculiar regularity is identified concerning photoacoustic (optoacoustic) phenomena. In particular, the acoustic signals following phase transitions in liquid irradiated by laser pulses are distributed by magnitude according to the Zjif’s law. This power law distribution describes many man made and naturally occurring phenomena, including city sizes, incomes, word frequencies, and earthquake magnitudes. This law suggests connection with anomalous decay, i.e. it implies that small occurrences are extremely common, whereas large instances are extremely rare. We use this law for signal processing in the course of optoacoustic diagnostics of diluted suspensions. The irradiation of an inhomogeneous liquid sample with a long train of short laser pulses and subsequent recording of a histogram of the magnitudes of the acoustic responses can serve as a diagnostic tool for various applications. The absorption of an incident light by a suspended particle may cause a cavitation event. The random cavitation events also obey the Zipf’s law, this fact being used for detection of individual particles.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126830135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The ultrasonic radiation mode theory","authors":"N. Declercq, R. Briers, O. Leroy, G. Shkerdin, J. Degrieck","doi":"10.1117/12.612784","DOIUrl":"https://doi.org/10.1117/12.612784","url":null,"abstract":"This paper describes a short history of the radiation mode theory (RMT) in ultrasonics. The RMT originates from electromagnetism where it has proved to be very efficient in the field of wave guides and discontinuities. In ultrasonics the RMT made its entrance only a decade ago and has already proved to be very efficient in describing the interaction of sound with discontinuities such as a step on a plate, a liquid wedge, the extremity of a plate and much more. It is likely that the development of the RMT for 2D isotropic media has come almost to an end. This papers lists some of the results obtained so far. Further extensions to more complicated media re to be expected the coming decade.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127617603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fiber direction determination in composites by means of Schlieren photography","authors":"N. Declercq, A. Teklu, M. Breazeale, R. Hasse, J. Degrieck, O. Leroy","doi":"10.1117/12.612767","DOIUrl":"https://doi.org/10.1117/12.612767","url":null,"abstract":"After a short description of the Ultrasonic Polar Scan Technique for characterizing composites, the paper describes and experimental method, based on the combination of Schlieren photography and a wide bounded ultrasonic beam of frequency 10 MHz, used to detect the fiber direction in composites. Experiments are described on unidirectional and fabric fiber reinforced composites. This method is not based on Lamb wave phenomena, which can be complicated for interpretation by NDT engineers, but rather is based on relatively simple principles, i.e. inhomogeneity and symmetry of composites.","PeriodicalId":405317,"journal":{"name":"Acousto-Optics and Applications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121418287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}