{"title":"SAW RF Spectrum Analyzer/Channelizer Using a Focusing, Phased Array Transducer","authors":"R. Brooks, J. Wilcox","doi":"10.1109/ULTSYM.1985.198484","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198484","url":null,"abstract":"The principle of Fourier t ransformation by wave diffraction has been demonstrated using surface acoustic waves. The input RF signal d rives a phased array of SAW interdigital transducers that act like a curved diffraction grating to focus and angularly disperse the generated acoustic waves with frequency. An array of output t ransducers partitions t he dispersed signal spectrum into contiguous narrow bands. The approach is novel and has a number of significant features. The device is passive, linear, and bidirectional, and preserves phase information. S idelobes and spurious signals can be suppressed by amplitude w eighting the input transducer elements and using mode selective output transducers. Several experimental devices has been constructed on LiNb03. These were evaluated electrically and with a scanning laser probe.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134496686","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":"Influence of Material Texture and Ionic Substitutions in Piezoceramics on the Resonance Frequency Dispersion Diagrams of Narrow-Strip Elements. Application to Multielement Ultrasonic Transducers","authors":"R. H. Coursant, P. Eyraud, L. Eyraud","doi":"10.1109/ULTSYM.1985.198583","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198583","url":null,"abstract":"An analysis of the influence of second order mate- rial differentiations on the resonance frequency dispersion diagrams of narrow-strip piezoceramic elements has been made. Some types of lead zircono- titanate piezoceramics and some types of modified lead titanate piezoceramics were considered with textures corresponding to natural sintering or to under-load hot-pressing and with weak or strong simultaneous ionic substitutions. The analysis turns on the comparison of the tensorial characteristics and/or the comparison between effective parameters derived from the resonance frequency dispersion diagrams. Considering high frequency applications, a 10 MHz linear array made from an under-load hot- pressed piezoceramic is described.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133165533","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":"Tissue Characterization from the Angular and Frequency Dependence of Ultrasonic Scattering","authors":"R. Waag","doi":"10.1109/ULTSYM.1985.198625","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198625","url":null,"abstract":"","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133485399","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":"Characterization of Ferrimagnetic Garnets for MSW-Optical Diffraction","authors":"A. Craig, John N. Lee, C. Wey, J. Barak","doi":"10.1109/ULTSYM.1985.198499","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198499","url":null,"abstract":"Bragg diffraction of guided optical waves by magnetostatic waves (MSWs) in thin film garnets will prospectively provide devices for signal processing at frequencies up to 20 GHz. Presently, advances in device performance are limited by low diffraction efficiency and by optical and MSW absorption. Use of improved garnet materials can circumvent these barriers. The materials properties required are: high Faraday rotation and low optical absorption and scattering, and low MSW absorption (i.e., low ferrimagnetic resonance linewidth). These garnet properties can be most critically influenced by substitutional constituents in the film composition. A coordinated effort for optimization of garnet materials for MSW and optical propagation and interaction has been pursued, employing measurement of ferrimagnetic resonance linewidth, saturation magnetization, Faraday rotation, and optical absorption.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133419045","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":"Automatic Calibration and Assessment of Thickness Mode Piezoelectric Transducers","authors":"G. Hayward","doi":"10.1109/ULTSYM.1985.198601","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198601","url":null,"abstract":"automatic measurement system which may be implemented on a microprocessor. The technique is based on the transient analysis of the time domain voltage step response of a thickness mode device. Such a transient technique is amenable to automation and if configured p roperly can provide accurate, repeatable and reliable results over a wide range of transducer configurations. This work describes the theoretical development and hardware instrumentation of a system required for the automated measurement of thickness mode piezoelectric transducer constants. The method is based on a transient analysis of the transducer voltaqe s tep response in the t ime domain. Important d evice parameters such as static capacitance, coupling coefficient, piezoelectric charge constant, mechanical resonant frequency, bulk velocity, specific acoustic impedance, absolute permittivity and mechanical stiffness in the thickness direction may be obtained from a single measurement and results are a ccurate to within * 5%.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123966955","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":"Velocity Dispersion Caused by Pore-Pressure Equilibration in Fluid-Saturated Porous Media","authors":"K. Winkler","doi":"10.1109/ULTSYM.1985.198672","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198672","url":null,"abstract":"The standard Biot theory for acoustic wave propagation in fluid-saturated porous media involves a pore-fluid pressure that is averaged over many pore volumes. This approximation is quite reasonable at low frequencies and in many synthetic materials. In certain types of materials at high frequencies (e.g. rocks at ultrasonic frequencies) the assumption of uniform pore-fluid pressure is not valid. The resulting flow of pore fluid causes acoustic velocities to vary with frequency. We show how the magnitude of this dispersion can be calculated from experimental ultrasonic data.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127980175","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":"Wideband Chirp-Transform Adaptive Filter","authors":"R. Arsenault","doi":"10.1109/ULTSYM.1985.198486","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198486","url":null,"abstract":"Abstract : A wideband chirp-transform adaptive-filter system is described that is capable of providing both spectral monitoring and the excision of multiple narrowband signals. The 80-MHz-bandwidth system processes a wideband continuous 300-MHz center-frequency input signal in 10-microsec. segments, using two identical subsystems to achieve 100-percent duty cycle. Spectral analysis is achieved with a multiply-convolve-(multiply) configuration in the forward section of each subsystem. Spectral components can then be excised by time gating of the forward transforms. Subsequently, inverse-transform sections employing a (multiply)-convolve-multiply configuration recreate 12.5-microsec-long segments of the filtered time-domain signal. Using a principle described previously, these output segments from the two subsystems are overlapped by 25 percent and combined coherently in order to cancel artifacts introduced by the input segmentation. The coherence required is of the order of 7 ps between adjacent segments and is obtained by using the reflective array compressors bilaterally so that both subsystems share common devices. The system provides one 100-kHz-resolution spectrum every 1-microsec at a delay of 20 microsecs. The overall signal delay of the adaptive filter is 40 microsec. Dynamic range in excess of 30 dB has been achieved. Excision of frequency subbands as narrow as 400 kHz by up to 30 dB will be described.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129304163","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 Measurements for Detecting Damage on Agricultural Products","authors":"B. Upchurch, E. S. Furgason, G. Miles, F. Hess","doi":"10.1109/ULTSYM.1985.198662","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198662","url":null,"abstract":"The use of ultrasonic measurements for distinguishing between bruised and unbruised apple tissue is presented. When an apple is damaged, the cells distort, and if the elastic limit of the cell wall has been exceeded, they rupture. Scanning electron micrographs showing the differences within the intercellular spaces between damaged and undamaged apple tissue are presented. The undamaged tissues contain a larger percentage of air spaces than the samples from damaged areas. This change in the tissue may be detected using ultrasonic transducers.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116851337","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":"Temperature Compensated ZnO/SiO2/Si Thin Film Resonator for VHF Voltage Controlled Oscillator","authors":"Y. Miyasaka, S. Hoshino, S. Takahashi","doi":"10.1109/ULTSYM.1985.198530","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198530","url":null,"abstract":"A new temperature compensated thin film resonator, consisting of a ZnO/SiOz/Si triple layer membrane, has been developed for application in a VHF voltage controlled oscillator (VCO). A t a 150 to 170 MI-Iz frequency range, resonators having desirable characteristics, such a s 40 ohms or less resonance resistance, 5 ppml\"C or less temperature coefficient and 70 to 90 capacitance ratio, have been realized. A Colpitts VCO was constructed for use a t 160 hlIIz, using the ZnOISiOz/Si resonator and a varactor diode. A 340 ppm frequency deviation has been obtained versus a control voltage change from 0 to 4 V: which is in good agreement with the equivalent circuit analysis.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117264730","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":"A Residue Number System for Wideband Acousto-Optic Spectrum Analysis","authors":"J. Pellegrino, Brian M. Sadler, S. Casey","doi":"10.1109/ULTSYM.1985.198537","DOIUrl":"https://doi.org/10.1109/ULTSYM.1985.198537","url":null,"abstract":"An architecture is presented which performs extremely wideband acousto-optic (AO) spectrum analysis using rf-preprocessing and smart, rapid postprocessing circuitry based on residue number theory. For k channels each with % resolution elements, where the %'s are relatively prime, the total number of possible resolution elements is given by IIm . The total rf bandwidth is folded into nk banis each % elements wide, and outputs of the k channels from the spectrum analyzer are compared to determine the frequency and intensity of signals within the system aperture. Current hardware performs A0 spectrum analysis over a 50MHz bandwidth with 25 kHz resolution. bbdifications to this hardware extends the bandwidth to a practical limit of approximately 300 MHz, maintaining the 25-kHz system resolution. Other systems are proposed for wider bandwidths, a nd the potential performance parameters for these systems are examined. The performance depends primarily on the choice of moduli T, the number of moduli k, and the number of bands nk.","PeriodicalId":240321,"journal":{"name":"IEEE 1985 Ultrasonics Symposium","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114402082","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}