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LIDAR
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NASA Why? Files segment demonstrating how LIDAR works, and NASA's hopes for the future of hurricane prediction using the technology.
Hello, Dr. Brau?
00:00:00
Oh, hello. You must be one of the treehouse detectives.
00:00:03
I just spoke with Dr. D on the phone, and he said you were coming over.
00:00:06
We're trying to figure out how scientists can predict if a tropical storm will get bigger or smaller.
00:00:09
I definitely can help you with that.
00:00:14
We learned about LIDAR before, but we could use a review. Can you help us?
00:00:16
Certainly. LIDAR is an acronym that stands for Light Detection and Ranging.
00:00:21
It's a pulsating instrument that is used to probe the atmosphere.
00:00:25
Let's take a look now at how laser light scatters in the atmosphere.
00:00:29
You've seen a laser pointer before.
00:00:32
If you would pass the beam from the pointer through this plume from the vaporizer,
00:00:35
you'll see the scattering from the small particles, just like a LIDAR sees in the atmosphere.
00:00:39
Wow, this is neat.
00:00:44
And if you would imagine using a pulsed laser, we could see where the scattering is and how much is there,
00:00:46
much like a laser radar.
00:00:52
But how do you measure water vapor with a LIDAR?
00:00:54
Well, come on, let me show you.
00:00:57
Take a look at these two laser beams.
00:01:01
Now you can slide the container of colored water into the two beams and see what happens.
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The green laser light almost disappears.
00:01:11
Exactly. And by comparing the intensity and how much changes in the green light,
00:01:14
we can calculate how much dye is in the cell.
00:01:19
So you mean you can detect the amount of water vapor
00:01:22
by comparing how two laser lights change when water vapor is present?
00:01:25
Exactly. Let's go see a LIDAR that's flown around a hurricane.
00:01:29
This LIDAR system is called LASE.
00:01:36
LASE stands for LIDAR Atmospheric Sensing Experiment,
00:01:39
and it was designed to go onto a very high-altitude airplane.
00:01:43
When LASE is flown on an airplane around a hurricane,
00:01:47
we can make measurements of how much water vapor is flowing into the hurricane.
00:01:50
We learned that water vapor feeds the storm.
00:01:54
You're right. Water vapor is the primary energy source that drives the hurricane.
00:01:56
Why would NASA want to fly around hurricanes?
00:02:01
The information we gather with our experiments
00:02:04
should help us to better predict hurricane behavior.
00:02:06
And we hope to develop very small LIDAR systems
00:02:09
that can go on unmanned aerial vehicles, or UAVs, which are small model aircraft.
00:02:12
Why would you want to put LIDAR on such small planes?
00:02:18
Well, a UAV can fly around a hurricane for several days
00:02:21
and get the information we need to help better predict what the hurricane will do.
00:02:25
In the future, we hope to develop a LIDAR system to go into space to do the same thing.
00:02:30
Wow. That would be really awesome.
00:02:35
Thanks, Dr. Brouwer. You've been a big help.
00:02:37
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 410
- Fecha:
- 28 de mayo de 2007 - 15:33
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 02′ 40″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 480x360 píxeles
- Tamaño:
- 16.04 MBytes
