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Author

Boaz Lissak

Bio: Boaz Lissak is an academic researcher from Tel Aviv University. The author has contributed to research in topics: Fiber Bragg grating & Long-period fiber grating. The author has an hindex of 6, co-authored 11 publications receiving 282 citations.

Papers
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Journal ArticleDOI
TL;DR: A novel, sensitive, simple, and robust strain interrogation technique is analyzed and experimentally tested, which achieves high dynamic strain sensitivity of 45 picostrain/ radicalHz rms at 3 kHz.
Abstract: A novel, sensitive, simple, and robust strain interrogation technique is analyzed and experimentally tested. By locking a laser wavelength to the midreflection wavelength of a standard fiber Bragg grating and measuring the error signal, we achieve high dynamic strain sensitivity of 45 picostrain/Hz rms at 3 kHz, where the dominant noise in the experiment is the laser frequency noise.

132 citations

Journal ArticleDOI
TL;DR: In this article, a novel and highly sensitive static strain interrogation technique is demonstrated, where the sensing element is a fiber-Bragg grating (FBG) and the light source is a frequency-locked diode laser.
Abstract: Novel and highly sensitive static strain interrogation technique is demonstrated, where the sensing element is a fiber-Bragg grating (FBG) and the light source is a frequency-locked diode laser. Locking the laser frequency to the center of an absorption line (atomic line of potassium in our experiment) eliminates the slow frequency drift of the laser. The stabilized laser source is used to measure low frequency ("static") strain, with a sensitivity of 1.2 nanostrain//spl radic/Hz rms at 1.5 Hz.

101 citations

Journal ArticleDOI
TL;DR: The effects of hard apertures on the transversal mode distribution and the output near and far field distributions are investigated both theoretically and experimentally.
Abstract: The effects of hard apertures on the transversal mode distribution and the output near and far field distributions are investigated both theoretically and experimentally. Wavefronts propagating in different directions inside a CO2 laser cavity were measured at the same plane and found to have different transversal amplitude profiles. The influence of intracavity aperture’s location and diameter on the near field distribution and far field beam quality were measured and calculated. Quantitative figures of merit are introduced to evaluate the departure of the transversal mode patterns from ideal Gaussians.

23 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented an analytical approach based on approximating the field inside the resonator by a truncated expansion in Gauss-Laguerre modes and performed further investigation of this configuration by using a Fox and Li type code which was recently applied to the analysis of a laser resonator with internal circular aperture.
Abstract: An optical resonator with holes on-axis for applications in a FEL oscillator was recently proposed by Pantell et al. [Nucl. Instr. and Meth. A296 (1990) 638]. These authors presented an analytical approach based on approximating the field inside the resonator by a truncated expansion in Gauss-Laguerre modes. We perform further investigation of this configuration by using a Fox and Li type code which was recently applied to the analysis of a laser resonator with internal circular aperture. This numerical approach allows us to check the range of validity of Pantell's solutions, the parameters for which they constitute the lowest-loss mode and to map the transverse profile of the mode at different planes inside the resonator.

14 citations

Proceedings ArticleDOI
18 Jun 1998
TL;DR: In this article, the wavelength of a single longitudinal mode laser is tuned to the mid-reflection wavelength of the FBG and the reflected light is measured using a photodetector.
Abstract: higher resolution and sensitivity can be attained using lasers with lower frequencynoise, e.g. diode-pumped solid-state lasers. Furthermore, since the strain signal directly altersthe optical power reflected from the FBG, it can be electronically demodulated.The principle of operation is the following: The wavelength of a single longitudinal mode laseris tuned to the mid-reflection wavelength of a FBG and the reflected light is measured using aphotodetector, see Fig. 1 .

11 citations


Cited by
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Journal ArticleDOI
TL;DR: This work presents an overview of progress and developments in the field of fiber optic sensor technology, highlighting the major issues underpinning recent research and illustrating a number of important applications and key areas of effective Fiber optic sensor development.
Abstract: This work presents an overview of progress and developments in the field of fiber optic sensor technology, highlighting the major issues underpinning recent research and illustrating a number of important applications and key areas of effective fiber optic sensor development.

823 citations

BookDOI
01 Jan 2001
TL;DR: Smart technology for textiles and clothing as discussed by the authors is an overview and review of smart textile composites integrated with fibre optic sensors. But it is not a comprehensive review of the entire literature.
Abstract: Smart technology for textiles and clothing - an overview and review. Electrically active polymer materials: application of non-ionic polymer gel and elastomers for artificial muscles. Heat storage and thermo-regulated textiles and clothing. Thermally sensitive materials. Cross-linked polyol fibrous substrates as multifunctional and multi-use intelligent materials. Stimuli-responsive interpenetrating polymer network hydrogels composed of poly(vinyl alcohol) and poly(acrylic acid. Permeation control through stimuli-responsive polymer membrane prepared by plasma and radiation grafting techniques. Mechanical properties of fibre Bragg gratings. Optical responses of FBG sensors under deformations. Smart textile composites integrated with fibre optic sensors. Hollow fibre membranes for gas separation. Embroidery and smart textiles. Adaptive and responsive textile structures (ARTS. Wearable technology for snow clothing. Bio-processing for smart textiles and clothing. Tailor-made intelligent polymers for biomedical applications. Textile scaffolds in tissue engineering.

251 citations

Journal ArticleDOI
TL;DR: Preliminary experimental results carried out with a perturbation frequency up to 98 Hz demonstrate the validity of the proposed dynamic strain measurements in optical fibers based on the stimulated Brillouin scattering interaction between two counterpropagating optical pulses.
Abstract: We present a technique for dynamic strain measurements in optical fibers based on the stimulated Brillouin scattering interaction between two counterpropagating optical pulses. The technique allows for a high sampling rate and permits to addressing dynamically and randomly the position at which vibration is measured. Preliminary experimental results carried out with a perturbation frequency up to 98 Hz demonstrate the validity of the proposed technique.

224 citations

Journal ArticleDOI
19 Nov 2010-Science
TL;DR: Strain measurements are reported at the 10−13ε-Hz–1/2 level using a fiber Bragg-grating resonator with a diode-laser source that is stabilized against a quartz-disciplined optical frequency comb, thus approaching detection limits set by thermodynamic phase fluctuations in the fiber.
Abstract: The measurement of relative displacements and deformations is important in many fields such as structural engineering, aerospace, geophysics, and nanotechnology. Optical-fiber sensors have become key tools for strain measurements, with sensitivity limits ranging between 10(-9) and 10(-6)e hertz (Hz)(-1/2) (where e is the fractional length change). We report on strain measurements at the 10(-13)e-Hz(-1/2) level using a fiber Bragg-grating resonator with a diode-laser source that is stabilized against a quartz-disciplined optical frequency comb, thus approaching detection limits set by thermodynamic phase fluctuations in the fiber. This scheme may provide a route to a new generation of strain sensors that is entirely based on fiber-optic systems, which are aimed at measuring fundamental physical quantities; for example, in gyroscopes, accelerometers, and gravity experiments.

203 citations

Journal ArticleDOI
TL;DR: In this article, a novel fiber optical fiber-magnetic sensor based on magnetic fluid was proposed in which the stable nanoparticles Fe3O4 magnetic fluid is synthesized firstly; the Fe 3O4 magnetometer was injected in capillaries containing etched fiber Bragg grating (FBG) as sensing element.

149 citations