3D Laser Scanning Technology.
A common misconception about 3D laser scanning
I think you’ll agree with me when I say 3D laser scanning, all that comes to mind is barcode scanning or x-ray body scan at the airport. The best part is when people go as far as to say that laser scanning is radioactive and it is best to stay a mile away from the scanner.
I agree it does look like alien technology, but in fact the laser scanner is a combination of electronics and precision optics plus and years of experience all built into a robust, portable unit. 3D laser scanning creates a digital representation of a physical object in the form of a point cloud which can later be converted into a 3D model.
What is 3D laser scanning?
In simple terms, 3D laser scanning is a non-invasive and non-destructive method to collect measurement data. It captures the shape of physical objects, buildings, infrastructure, etc. using pulses of laser light. As the scanning is in progress, it stores the measured points in files called point clouds. The laser light is able to capture any free-form shape within its range, to a surprising level of fine detail.
3D laser scanning is an ideal alternative for capturing the exact shape and size of an object as compared to the traditional method of hand measurements and CAD drawing. 3D laser scanning is able to improve the engineering and design process by speeding up measurement tasks and reducing or eliminating data collection errors.
3D laser scanners are commonly used for on-site surveying of topography, internal and external building structure, piping, conduit and equipment. They can also be used to audit material inventories. How is this useful for auditing? Let me explain in an example. Dirt and loose materials are hard to measure due to their free-form shape. In the past, measurements were usually done with estimations using height, width and length. Using 3D laser scanning however, we are able to accurately capture the shape of the dirt pile in a 3D model and calculate the volume to a more precise degree. The accuracy of this process makes it suitable for volume calculation of stockpile inventory and auditing purposes.
Why do 3D laser scanning?
Here’s the deal:
- Low cost
- Low time of data acquisition.
- Saves time and money.
- Full and accurate 3D representation of the objects which can be used for measurement.
- Point clouds that can be used for CAD modelling.
- 2D plans and 3D models that are compatible with standard CAD software such as AutoCAD.
- Easy 2D and 3D documentation for engineers, B.I.M coordinators and architects.
- Scanning allows reconstruction of complex structural elements.
- Easy conversion of laser scanning into ORTHOPHOTOS.
- Volume calculation for materials that do not have a regular geometric shape.
- Point clouds can be converted into the appropriate format to be used for inspection or reverse engineering.
Once 3D laser scanning produces 3D model, what can I do with a 3D model
I would assume that if you are reading this, you would like to know more about 3D models. As the saying goes, if a picture is worth a thousand words, a 3D model is worth a thousand pictures. How is that? Well, a 3D model is a digital representation of the object or area. Since it is in digital form, its exact shape and size can be understood in ways not possible otherwise. That’s not all. The 3D model can be modified to make a new product or repair an existing design to accurately reproduce the object by other means such as milling technologies, water jet cutting, rapid prototyping or 3D printing. Or course if you do not want to do any of these things, you can just scan and keep the 3D model for safekeeping as documentation for future reference , knowing that all of the intricate details of the part will never be lost should be part be destroyed. The sky and your imagination is the limit as to what you can do once the object is in its digital form.
Just a thought and a small example here, facial structure can be scanned and the 3D model can be modified to your taste before the actual plastic surgery is done. The best part is, it is probably cheaper, safer and less painful, because going under the knife can be painful to rectify an error. What about the eyes? Some lasers are eye-safe.
Limitations? How big can I go? How small can I go? Lightings? Specific settings?
Great news! With different laser scanners, we are able to scan huge factories to tiny parts and everything in between. Examples of scanning we have done range from the interior and exterior of a State Capitol, monuments, churches and power plants to things as small as a coin, internal parts of expensive watches such as Rolex, separate parts of guns and even dental braces. We are also able to scan complex organic surfaces such as lotus textures.
As to settings, our scanner is able to scan indoors and outdoors, bright or dark areas, and at a wide range of temperature differences. Different scanners are used depending on the fine details required. Our scanners are portable, therefore we are able to scan at the client's location. But usually if it is small enough, clients are encouraged to ship the item to our nearest office. This is because our offices are better equipped and have better setup to scan things quickly.