Lidar is a revolutionary technology that can map an area with an impressive level of detail, including the ability to see through walls, trees, and other obstacles. But can it really penetrate walls? Here we'll explore the current technologies and their capabilities to see or penetrate walls. Sonar is not effective at penetrating walls made of solid objects because sound waves don't travel well through the vibrating particles that make up solid objects. Radar can't see through walls with real accuracy because rays propagate when they hit solid objects, which can lead to false positives.
In addition, walls can absorb radar waves depending on the material they are made of. Radio waves aren't effective at seeing through walls because they spread in all directions when they hit solid objects, making it difficult to see an image. In addition, radio waves easily bounce off substances such as metal and glass, making it difficult to distinguish what is an object and what is part of the background. Lidar, or Detection and Range of Light, emits pulsed laser light that is then reflected on objects. The system calculates the time it takes for lasers to rebound to determine a distance based on the speed of light.
No, you can't see through walls with thermal images. Thermography works by detecting the infrared radiation emitted by objects and converting the signal into a thermal image, where different temperatures are represented with different colors or shades of gray. A thermal or infrared camera will only be able to detect the heat from the wall, not what's actually behind it. Therefore, if something were inside the wall, such as a lack of insulation, and caused a large enough temperature difference, it would be picked up by a thermal camera. No, X-rays can't see through walls at all.
That's not how technology works. Now that we know all the technologies that can't see through walls, let's look at something that's being developed and has the most potential. Range-R radar devices are the closest to being able to see through walls. Range-R radar devices identify a person's location based on sound waves that bounce off a handheld device. They can see the sounds produced by the movement of a person through a wall because ultra-low frequency radio frequency waves are reflected by any object in their path, but the device only measures the distance and not what is beyond it.
The Range-R has also been criticized about whether or not it violates Fourth Amendment rights, since it can detect what is happening inside homes if the police are standing outside with the device. Radar devices, such as the Range-R, are the closest to being able to pass through walls, but they still lack what is normally imagined when people think of seeing through walls. The only way to see the inside of a structure with a wall is if someone on the other side opens a door, window, or goes outside. So for now we have to rely on good old fashioned human vision. Sometimes a pulse of light doesn't reflect off a thing. As in the case of trees, a pulse of light could have multiple returns.
LiDAR systems can record information from the top of the awning, through the awning to the ground. This makes LiDAR valuable for interpreting the structure of the forest and the shape of the trees. Similarly, the radar can detect a glass wall or door, while the Lidar will “see through them”. This makes radar a perfect sensor for robotics that operate in sports stadiums. No, thermal cameras can't see through walls, at least not like in movies.
The walls are generally thick enough and insulated enough to block any infrared radiation from the other side. If you point a thermal camera at a wall, it will detect the heat from the wall, not what's behind it. However, if something inside the wall causes a sufficient temperature difference, a thermal imaging camera will be able to detect it on the wall surface. Building maintenance professionals often use thermal imaging cameras to detect problems such as water leaks or lack of insulation without having to tear down walls to assess the problem.
Therese Reinsch: When LiDAR systems collect data in point cloud form all LiDAR data points are not ranked as to what they are affecting. So where do you find LiDAR data? Here's a list of 6 free LiDAR data sources, so you can start your search.
Standard LIDAR technologyis also not suitable for applications where there is water since the water absorbs the LIDAR signal.
In conclusion, while current technologies cannot penetrate walls with real accuracy or clarity yet, there is potential for future development in this area. Range-R radar devices are currently leading this development and may soon be able to provide us with more accurate images from behind solid objects. For now though we must rely on good old fashioned human vision when looking for answers beyond our walls.