Fiber optic detection of laser generated ultrasound for materials characterization

by Andrew Michael Davis

Publisher: National Library of Canada in Ottawa

Written in English
Published: Downloads: 92
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Edition Notes

Thesis (M.A.Sc.)--University of Toronto, 1993.

SeriesCanadian theses = Thèses canadiennes
The Physical Object
FormatMicroform
Pagination2 microfiches : negative.
ID Numbers
Open LibraryOL15100756M
ISBN 100315835419
OCLC/WorldCa31286778

Measurement by Laser Generated Ultrasound of Both Stiffness Coefficients and Viscosities of an Isotropic Polymer Material Disbond Detection and Characterization Using Horizontally Polarized Shear Waves and EMAT Probes. Pages Laser Generated Lamb Waves in Composite Materials Using Embedded Fiber Optic Delivery System. Pages. Optical resolution photoacoustic microscopy (OR-PAM) provides high-resolution, label-free and non-invasive functional imaging for broad biomedical applications. Dual-polarized fiber laser sensors have high sensitivity, low noise, a miniature size, and excellent stability; thus, they have been used in acoustic detection in OR-PAM. Here, we review recent progress in fiber-laser-based ultrasound. Fiber optic sensors, medical imaging and inverse methods, and laser generation of ultrasound are covered as well. Physicians, technicians, researchers, and physical scientists will find the book insightful. Materials Characterization Photoacoustic techniques are a subset of ultrasonic methods wherein laser generated stress waves are used to obtain information about structural and material properties. In photoacoustic techniques, the ultrasound is typically also detected using non-contact optical detection, thereby enabling truly non-contact.

Development and Characterization of a Flat-Panel Detector-Based Microtomography System Abnormality of Ball Bearing with Ultrasonic Technique p Non-Destructive Evaluation Using Laser-Generated Ultrasonic Waves p A Study on the Characteristics of Surface Wave Induced by Phased Array Ut Optical Detection of Ultrasound, IEEE Trans. Silicon Tipped Fiber-Optic Sensor Platform We are developing high-speed and high-resolution temeprature sensors to characterize the ocean turbulance in oceanoghric research. Compared to silica, the material that makes the optical fiber, silicon has a thermo-optic coefficient 10 times higher and a thermal conductivity 60 time higher. Fiber-optic Based Heterodyne Interferometer for Noncontact Ultrasonic Determination of Acoustic Velocity and Attenuation in Materials Optical Parameter Effects on Laser Generated Ultrasound for Microstructure Characterization. Pages Nondestructive Characterization of Materials Book Subtitle Proceedings of the 3rd International. - fiber-optic laser ultrasound generator (FLUG) systems. We have used the fiber-optic ultrasound systems developed here for process monitoring. We have also used the generation and detection systems for detection of simulated flaws. Technology transfer of a system that was partially developed under this grant was accomplished through.

It currently utilizes one optical fiber for delivery of a high power laser pulse and another for collection of the LIBS signal. In most applications a nm Nd:YAG laser is launched into an excitation optical fiber and focused on the sample at the distal end. This results in the formation of . [2] Ultrafast Fabry-Perot fiber optic pressure sensors for multimedia blast event measurements, Vol. 8, Iss. 3, Apr. 4, [1] High-efficiency optical ultrasound generation using one-pot synthesized polydimethylsiloxane-gold nanoparticle nanocomposite, Vol. 7, Iss. 10, Oct. 5, Journal Papers (go to conference papers): Detection of laser generated ultrasound with a conjugate interferometer scheme", (). Development of intrinsic fibre optic evanescent-wave sensor for in-situ cure monitoring of polymeric materials. Piezoelectric devices used for production and echo detection of acoustic waves in the macroscopic scale are too rigid in order to resolve signals within time scales of a few picoseconds and corresponding frequencies of THz. In , researchers at Brown University proposed the use of laser-generated ultrasound for film thickness.

Fiber optic detection of laser generated ultrasound for materials characterization by Andrew Michael Davis Download PDF EPUB FB2

Other materials have been studied for the optically generated ultrasound purpose, including carbon nanotubes and polyimide. By mixing carbon nanotubes within PDMS, Baac et al. observed a strong ultrasound generation when excited by a pulsed laser.It has been reported that the efficiency was 18 times better than using a chromium film and 5 times better than using gold Cited by: Four fiber optic ultrasound generation elements with different fiber lengths (1, 5, 9, 13 m or 1, 5, 5, 1 m) were used to build the ultrasound phased array generator.

Abstract: A method is proposed to stabilize an intrinsic fiber optic Fabry-Perot interferometric sensor embedded in a solid material for the purpose of detecting ultrasound.

Without stabilization the interferometer drifts out of quadrature due to the presence of low-frequency dynamic strains. Stabilization is achieved by using active homodyne stabilization which tunes the laser frequency to. The fiber optic ultrasound generation element converts laser pulse energy beamed on to photoabsorption material into sound wave.

The fabrication of the fiber optic ultrasound generation element was published in. Fiber optic ultrasound phased array generator designCited by: 2.

We demonstrate a side-polished fiber-optic ultrasound sensor (SPFS) with a broad frequency bandwidth (dc–46 MHz at 6-dB reduction) and a wide amplitude detection range from several kPa to MPa.

It also exhibits a high acoustic sensitivity Fiber optic detection of laser generated ultrasound for materials characterization book mV/MPa with a signal-to-noise ratio of 35 dB and a noise-equivalent pressure of kPa (over 1 Author: Jeongmin Heo, Kyu-Tae Lee, Ryun Kyung Kim, Hyoung Won Baac.

The phenomenon of photoacoustic effect has been known for many years, but its investigation and application had to wait until the development of proper laser sources, sensitive and broadband ultrasound detection technologies, fast data acquisition and processing capabilities [].The peculiar and effective characteristic of photoacoustics is the combination of the advantages of optical.

Photoacoustic imaging 1,2,3,4 employs laser-generated ultrasound to provide images of absorbing soft-tissue structures. It provides greater penetration depths than purely optical. Laser-generated ultrasound (LGUS) technique is an effective way to resolve these issues. devices mounted on the tip of an optical fiber, whereas acousto-optical detection is performed in a.

Chen, S.-L. Review of Laser-Generated Ultrasound Transmitters and Their Applications to All-Optical Ultrasound Transducers and Imaging. Appl. Sci. 7, 25 (). A new fiber-optic force sensor based on optical beam deflection for the investigation of the mechanical effects during laser–metal interaction underwater is developed.

This sensor is applied to detect the laser-induced plasma ablation force and liquid-jet impact during the cavitation bubble collapse near a solid boundary when a Q-switched.

This paper presents the design, fabrication and characterization of a broadband miniature fiber optic ultrasound generator based on photoacoustic (PA) ultrasound generation principle for biomedical ultrasound imaging and ultrasound non-destructive test (NDT) applications.

A novel PA generation material, gold nanocomposite, was synthesized by directly reducing gold nanoparticles within. A beam-steering C-scan system for laser generation and detection of ultrasound in opaque solids has been developed.

For ultrasound detection, the system uses a confocal Fabry-Perot interferometer that is stabilized at its high-sensitivity point by implementing a novel procedure that does not require a reference beam.

This stabilization procedure effectively compensates for slowly varying (up. Ultrasonic detection of surface acoustic waves has been shown to have important applications in determining microstructural properties, inspection of materials for quality control and for detection of flaws in materials.

Several laser generated optical techniques have been shown to be highly sensitive for the detection of ultrasound [1]. Photoacoustic ultrasound excitation has great potential in structural nondestructive testing and applications for medical treatments as a promising alternative to electrical ultrasound.

This study proposes and demonstrates a multipoint optical fiber laser-ultrasonic transducer system, wherein the fiber-optic ultrasonic transducer is fabricated by a coreless fiber segment&#x;s fusion with. 25 September Generation and detection of broadband laser generated ultrasound from low-power laser sources.

Broadband Lamb-wave measurements for materials characterization Proceedings of SPIE (July 21 ) Proceedings of SPIE (May 31 ) The detection of ultrasound using fibre optic sensors Proceedings of SPIE (July 02 Non-contact damage detection in composite laminates using laser-generated ultrasound Jakub Mrówka1, Jakub Spytek1, Łukasz Pieczonka1, Łukasz Ambroziński1 1 AGH University of Science and Technology, Krakow; *corresponding author, E-mail: @ Abstract The laser-based techniques possess multiple unique.

A broadband all-optical ultrasound transducer has been designed, fabricated, and evaluated for high-frequency ultrasound imaging. The device consists of a 2-D gold nanostructure imprinted on top of a glass substrate, followed by a 3 μm PDMS layer and a 30 nm gold layer.A laser pulse at the resonance wavelength of the gold nanostructure is focused onto the surface for ultrasound generation.

Laser Sources for Generation of Ultrasound James W. Wagner Department of Materials Science and Engineering Johns Hopkins University Baltimore, MD Abstract Two laser systems have been built and used to demonstrate enhancements beyond current technology used for laser-based generation and detection of ultrasound.

The first system. Furthermore, LGUS in conjunction with optical detection of ultrasound allows all-optical ultrasound imaging (i.e., ultrasound is generated and received optically).

The all-optical platform offers unique advantages in providing high-resolution information and in facilitating the construction of miniature probes for endoscopic ultrasound. A new approach is presented for ultrasonic detection of small surface-breaking and subsurface cracks using laser-based techniques.

This approach does not monitor the interaction of a generated ultrasonic wave with a flaw, as in the case of traditional pitch-catch or pulse-echo methods, but rather monitors the changes in the generated ultrasonic signal as the laser source passes over.

Ultrasound Characterization and Imaging: Ultrasound was generated with pulsed laser light, with a pulse width of 2 ns and a wavelength of nm (SPOT‐10‐‐, Elforlight, UK).

The pulse energy delivered to the coating was μJ, with a corresponding fluence of mJ cm −2. In this work the response of an embedded fiber optic Fabry–Perot ultrasound sensor has been investigated.

Calculations were performed that model the fiber as a cylindrical elastic inclusion subjected to obliquely incident harmonic plane waves. The phase shift of the light traveling in the fiber was calculated along the principal strain axes as a function of ultrasonic frequency and incident.

The velocity of a sound wave traveling in a medium is proportional to the medium’s temperature. The fiber optic ultrasonic sensing system was applied to measure the change of the velocity of sound. A fiber optic ultrasonic generator and a Fabry-Perot fiber sensor were used as the signal generator and receiver, respectively.

Light launched from a nm Nd:YAG nanosecond laser (Surelite I, Continuum) traveling through a / μm optical fiber was shone onto the black PDMS and the ultrasonic signal was thus generated. Figure 1 shows an ultrasonic signal that was generated by the fiber optic ultrasonic generator.

A method and apparatus for generating and detecting ultrasound on a workpiece utilizing a long pulse laser. A modulated pulsed laser beam is directed at the workpiece. The pulse duration is defined to be the time of propagation of ultrasound from a generation location to a flaw or discontinuity to be detected within the workpiece and then to a detection location, or, the time of propagation of.

Abstract: An all-optical ultrasound probe for vascular tissue imaging was developed. Ultrasound was generated by pulsed laser illumination of a functionalized carbon nanotube composite coating on the end face of an optical fiber.

Ultrasound was detected with a Fabry-Pérot (FP) cavity on the end face of an adjacent optical fiber. Fiber-optic biosensors typically use a light transmittable, tapered fiber to send excitation laser light to the detection surface and receive emitted fluorescent light.

The fluorescent light excited by an evanescent wave generated by the laser is quantitatively related to fluorophor-labeled biomolecules immobilized on the fiber surface.

Won Young Choi, Hyeong Geun Jo, Soo Won Kwon, Young Hun Kim, Joo Young Pyun, Kwan Kyu Park, Multipoint-Detection Strain Sensor with a Single Electrode Using Optical Ultrasound Generated by Carbon Nanotubes, Sensors, /s, 19, 18, (), ().

We demonstrate a side-polished fiber-optic ultrasound sensor (SPFS) with a broad frequency bandwidth (dc–46 MHz at 6-dB reduction) and a wide amplitude detection range from several kPa to MPa.

It also exhibits a high acoustic sensitivity of mV/MPa with a signal-to-noise ratio of 35 dB and a noise-equivalent pressure of kPa (over 1–50 MHz bandwidth) measured at 7-MHz frequency.

Cong Du, Jones Owusu Twumasi, Xu Guo, Jingcheng Zhou, Qixiang Tang, Nan Wu, Tzuyang Yu, Xingwei Wang,”Fiber Optic Multiplexing Ultrasound Detection of Rebar in Concrete“, Conference on Lasers and Electro-Optics Pacific Rim, 31 July - 4 Aug,Sands Expo and Convention Center, Singapore, 31 July - 4 Aug.

power pulsed laser to generate ultrasound. PACS: +n, +z Keywords: laser ultrasonics; material characterization; nondestructive technique 1. Introduction Acoustic, acousto-optic (AO), and electro-optic (EO) devices were under research in Brazil since the years [1]-[3].

The aim of such effort was the laser control and applications. Multichannel optical-fibre heterodyne interferometer for ultrasound detection of partial discharges in power transformers.

J E Posada, J A Garcia-Souto and J Rubio-Serrano. Published 24 July • IOP Publishing Ltd Measurement Science and Technology, Vol Number 9. In this study a theoretical framework for calculating the acoustic response of optical fiber-based ultrasound sensors is presented.

The acoustic response is evaluated for optical fibers with several layers of coating assuming a harmonic point source with arbitrary position and frequency. First, the fiber is acoustically modeled by a layered cylinder on which spherical waves are impinged.