Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

3.9K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
3.9K
Van de Graaff Generator01:15

Van de Graaff Generator

1.8K
Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
1.8K
Transformers01:26

Transformers

1.2K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.2K
Bridge rectifier01:24

Bridge rectifier

816
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
816
Generation of Three-Phase Voltage01:21

Generation of Three-Phase Voltage

468
A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
As the rotor...
468
Types Of Transformers01:16

Types Of Transformers

1.0K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.0K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Remote Super-Resolution Mapping of Wave Fields.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2025
Same author

Modulation of Point Spread Function for Super-Resolution Imaging.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2023
Same author

Ultrasound Concave 2-D Ring Array for Retinal Stimulation.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2023
Same author

Performance Enhanced Ultrasound Probe Tracking With a Hemispherical Marker Rigid Body.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control·2021
Same author

Fabrication of an Extremely Cheap Poly(3,4-ethylenedioxythiophene) Modified Pencil Lead Electrode for Effective Hydroquinone Sensing.

Polymers·2021
Same author

Synthesis of MOF525/PEDOT Composites as Microelectrodes for Electrochemical Sensing of Dopamine.

Polymers·2020

Video Experimental Relacionado

Updated: Sep 10, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

21.9K

Producción de haces de Bessel con un transformador de RF

Jian-Yu Lu

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
    |August 21, 2025
    PubMed
    Resumen

    Los investigadores desarrollaron un nuevo método para crear haces de Bessel de banda ancha utilizando un único amplificador de potencia de radiofrecuencia (RF), reduciendo el tamaño y la potencia para aplicaciones avanzadas de imágenes de ultrasonido.

    Área de la Ciencia:

    • Acústica y fenómenos de ondas
    • Tecnología de imágenes médicas
    • Ciencias de los materiales

    Sus antecedentes:

    • Los haces de Bessel ofrecen una propagación libre de difracción y una gran profundidad de campo, ideales para diversas aplicaciones.
    • La generación tradicional de haces de Bessel de ultrasonido requiere sistemas de amplificadores múltiples voluminosos e intensivos en energía, lo que limita las aplicaciones portátiles.

    Objetivo del estudio:

    • Desarrollar un método compacto y eficiente para la generación de haces de Bessel de banda ancha para aplicaciones de ultrasonido.
    • Para permitir aplicaciones de haz de Bessel en imágenes médicas portátiles y imágenes de súper resolución.

    Principales métodos:

    • Utilizó un único amplificador de potencia de radiofrecuencia (RF) de alto voltaje y un transformador RF personalizado.

    Más Videos Relacionados

    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
    10:42

    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

    Published on: May 3, 2019

    6.9K
    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    11.6K

    Videos de Experimentos Relacionados

    Last Updated: Sep 10, 2025

    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
    12:14

    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

    Published on: August 12, 2013

    21.9K
    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
    10:42

    Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

    Published on: May 3, 2019

    6.9K
    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

    Published on: July 12, 2017

    11.6K
  • Utilizó un transductor de anillo de banda ancha de 10 anillos de 2,5 MHz hecho de un compuesto de cerámica y polímero PZT.
  • Impulso generado de haces de Bessel en agua a aproximadamente +/-90 V.

    • Principales resultados:

    • Logró rayos de Bessel de pulso comparables a los de múltiples amplificadores, simulaciones y teoría.
    • Se ha demostrado una anchura de haz de -6 dB de aproximadamente 2,53 mm (longitudes de onda 4,22).
    • Se obtuvo una profundidad de campo significativa de aproximadamente 216 mm (360 longitudes de onda).

    Conclusiones:

    • El nuevo método reduce significativamente el tamaño, el peso y el consumo de energía de los sistemas de generación de haz de Bessel.
    • Este avance facilita la integración de los haces de Bessel en los dispositivos de ultrasonido portátiles.
    • Potencial demostrado para imágenes en 3D y en varios planos utilizando rayos de Bessel con un reflector escaneado.