What is meant by Guided Wave?
guided wave: A wave having (a) energy concentrated near a boundary, or between substantially parallel boundaries, separating materials of different properties and (b) a direction of propagation effectively parallel to these boundaries. (
What does a waveguide do?
A waveguide is a structure that guides waves, such as electromagnetic waves or sound, with minimal loss of energy by restricting the transmission of energy to one direction.
What are guided waves give examples?
Lamb waves are guided waves traveling along thin plates, whereas Rayleigh waves are guided waves constrained to the surface. Guided waves can also exist in solid and hollow cylinders, as well as in shell structures.
What is the advantage of waveguide?
The main advantage is that waveguides support propagation with lower loss. The electric and magnetic fields, which are used for the transport of energy, are equal to zero in metal surfaces. Therefore, these fields are confined to the space within the waveguides walls.
How does a guided wave radar work?
Guided wave radar is based on microwave technology. The device sends a low energy microwave pulse down a probe. When the pulse hits the media, a significant proportion of the energy is reflected back up the probe to the device. The level is directly proportional to the time-domain reflectometry.
What is guided wave propagation?
Guided wave testing (GWT) is a non-destructive evaluation method. The method employs acoustic waves that propagate along an elongated structure while guided by its boundaries. This allows the waves to travel a long distance with little loss in energy.
What is a waveguide made of?
Waveguide materials Typically waveguide is made of brass, copper, silver, aluminum, or any metal that has low bulk resistivity. It is possible to use metals with poor conductivity characteristics, if the interior walls are properly plated. It is even possible to make plastic waveguide!
How does a waveguide get damaged?
If you are not handling the microwave with care, the waveguide will break. The waveguide is brittle so it can be broken by dishes that are roughly placed inside of the oven. Although you can use a microwave oven without a waveguide, it should be replaced before continuing use of the oven.
What are the types of waveguide?
Types of Waveguides
- Rectangular waveguide.
- Circular waveguide.
- Elliptical waveguide.
- Single-ridged waveguide.
- Double-ridged waveguide.
What are the modes in waveguide?
Waveguide mode stands for a unique distribution of transverse and longitudinal components of the electric and magnetic fields. There are two types of waveguide modes that can propagate in the waveguides: TE (Transverse Electric) and TM (Transverse Magnetic).
What is the disadvantages of waveguide?
Drawbacks or disadvantages of Waveguide ➨It is not suitable for operations at lower frequencies due to increased dimensions. ➨It is very bulky in size and weight. ➨It is not economical. ➨TEM mode of propagation is not possible in the waveguide.
What is the difference between radar and guided wave radar level transmitter?
Guided Wave Radar (GWR) uses a probe to measure to guide high frequency, electromagnetic waves as they travel down from a transmitter to the media being measured. Non-Contacting Radar sends down an electromagnetic wave through the air, it then reflects off the media and returns back to the device.
What is guided wave (GW) testing?
Guided Wave (GW) testing on the other hand is a technique in which the ultrasonic waves propagate through the boundaries of a structure, and these boundaries actively affect the mode of propagation. Unlike bulk waves, there could be hundreds of guided wave modes with different velocities and frequencies on a given structure.
What is the principle of operation of a waveguide?
Principle of operation. Waves propagate in all directions in open space as spherical waves. The power of the wave falls with the distance R from the source as the square of the distance (inverse square law). A waveguide confines the wave to propagate in one dimension, so that, under ideal conditions, the wave loses no power while propagating.
What are the benefits of guided waves?
The benefits of guided waves can include: 100% coverage throughout the thickness of the structure Inspection over long distances from a single probe position Ability to inspect hidden and inaccessible regions of structures as well as structures under water, coatings, insulation, and concrete
What types of structures can be guided wave inspected?
Guidedwave offers a wide variety of technologies for guided wave inspection of plates/shells, pipes, tubes, storage tanks, and many other structures. Explore the other Knowledge and Product sections to learn more, or contact a Guidedwave engineer. Many engineered structures can act as natural waveguides for guided wave applications.