Questions related to Laser Scanning
We want to estimate the canopy volume of trees by 3D mapping using the LiDAR sensors. Please suggest low-cost LiDAR sensors available in India for 3D mapping.
Below are the few which are known to me. Which devices have you used to acquire building Point Clouds? What technology does the device use? I think many researchers are looking for choices of devices for their various projects and this post can help them to put the list on the table.
- Ipad Pro 2020
- Google Tango
- ZED Cam
I am adding below the Suggested Choices by respondents:
- Geo SLAM - ZEB Go
- FARO Freestyle 3D hand scanner
- Dotproduct DPI-10
For antimicrobial evaluation of antibiotics-releasing scaffolds against the biofilm, we have planned to perform live/dead bacterial assay to be observed under confocal laser scanning microscopy. However, if the microorganism is an obligate anaerobe, we assume that it will be difficult to use this method, as the bacterial cells may die on exposure to air during observation under confocal laser scanning microscope.
Can anyone suggest some modification of this method or any other protocol to be followed in case of such obligate anaerobes?
Hello everyone, I am modeling an AM process called SLM, on which a laser scan a powder bed in order to build a part. I am currently having problem with the phase-transformation phenomena (from powder, to liquid and finally solid), since a lot of work done on the field are using different approaches and mostly of them are not in my scope (modeling crystalline micro-structure formation and liquid flow). I already have a lot of data for temperature dependent properties (thermal conductivity, heat capacity, coeff. of expansion, etc).
Since I want to account for temperature distribution and thermal strains, which method would be advisable and would be quickly to implement?
I have read about account for the solid or liquid fraction into the enthalpy formulation, but I don't know which subroutine or how to implement it.
I am trying to image and quantify bacterial cells on muscles using confocal laser scanning microscope. But I am having trouble quantifying the bacteria as the stains that I used ( live/dead staining) also stains the muscle fibres.
Can anyone recommend a stain that would only stain bacterial cells ? Thank you
I am eager to know what is the procedure in software like Catia, Cloud Compare, Geomagic or etc, that remove noise from Point Clouds(PCs); especially when the PCs does not contain RGB or intensity information and it just contains 3-D coordinates of points. (e.g.PCs are obtained from laser scanner. )
Thanks in advance
3D Laser scanning (also known as LiDAR – Light Detection And Ranging) combines a laser rangefinder with controlled steering of laser beams
Building Information Modeling (BIM) is an intelligent 3D model-based process that gives architecture, engineering, and construction (AEC) professionals the insight and tools to more efficiently plan, design, construct, and manage buildings and infrastructure.
Please see question above. Thanks for your response.
I have a laser scan from 1M barrel reservoir tank which was in service for 20 years. This led to some spatial dislocation in some points of the tank which demands FEM analysis for the sake of FFS (Fit For Service). Therefore, I have to define spatial displacement for the tank which leads to stress. Then, I want to put the liquid inside and see if the tank can tolerate the pressure or not!
now the question is here:
How can I define the new location of the nodes?
Thanks a Million
while working on distortion simulation of SLM process in Simufact additive i figure out that there is no way to relate the scanning pattern and laser power and laser scanning speed in the software package , how can i incorporate these among the simufact additive simulation?
We have deposited amorphous germanium thin films on silicon using evaporation. This was followed by pulsed laser annealing using Nd: YaG laser. Above threshold intensity, it was observed that the amorphous germanium recrystallizes as crystalline germanium. However surface ripples and a pattern of lines was observed on the surface that were aligned 55 degrees to the laser scan direction.
I am working on terrestrial LiDAR modelling and simulation, and I was wondering how to prepare the correct model of LiDAR rotation. I don't understand how laser scanning pattern looks like. I know that most of the 3D sensor has 360 degree horizontal FOV and about 27 degree vertical FOV but I don't know how to connect these two things. Based on pulse rate and rotation rate I calculated degree between pulses but only in XY plane (horizontal scanning). How to add also vertical scanning? Could you give me some examples of scanning pattern and how to simulate LiDAR scanning based on LiDAR's parameters?
i need the exact protocol for preparing the rhodamine B dye
to concentration of 0.1% and the quanitity needed for mixing 0.1% of rhodamine B dye to root canal sealer to examine it under conofocal laser scanning microscope (NIkon,Japan)
also is the dye altering the flow and setting time of the root canal sealer ?
this is all information i have about Rhodamine B dye
Rhodamine B from sigma aldrich
Synonym: Basic Violet 10, Brilliant Pink B, Rhodamine O, Tetraethylrhodamine
mp 210-211 (dec.)(lit.) solubility H2O: 1 mg/mL absorption extinction/542-554 nm, methanol 104500-115800
and i will use Sure Seal bioceramic root canal sealer from Sure Dent, Korea
and AH Plus from Dentsply
I am involved in a project for the measuring of a mold internal volume.
It is divided in two parts and we want to find the capacity of the closed.
In order to do this we actually scan the two components with laser scanning and obtain the internal volume using a software .
We are looking for high precision method in order to compare our measure with a "reference", more precise, one.
Do you have any idea
Thank you in advance.
2 or 3 dimensional laser scanning are mostly done using photo-detectors to collect the reflected light and then using detection and plotting techniques. What are the most conventional or suitable photo-detectors?
Is it possible to have different point densities within a point cloud file of a large area? If so, which parameters play role in it?
Also, does it matter if the point cloud is created from image photogrammetry or airborne laser scanning (ALS)?
I have been using frontal lobe slice of 3–5 mo. old mice with its thickness of 300μm for intracellular Ca2+ measurement over confocal laser-scanning microscope [Zeiss LSM 700.] Fluorophore of choice is Indo 1-AM as its capability to penetrate cell membrane through bath loading (Tank et al. 1992).
I design protocol of loading is as follows: slice incubated in 1ml Ca2+-free ACSF (5μM Indo 1-AM) at 37ºC for 30 mins, subsequently, washed gently with 3ml of the same solution. The slice carbogenized throughout the process.
I gain, however, very weak fluoresced spots throughout the slice in ocular observation but no signal detected in the software (as in the figure.) I am unsure the laser (405nm) is incapable of penetrating with the thickness employed.
Any suggestions are welcomed and appreciated.
My sample is spherical shape silica gel. Every time I scan, it drifted. But for my research I need same area scan for several times. then I want to analyse the differences. Detail of my scanning:
Scan area 5 mircro by 5 micro
Operating mode: tapping
Simulating a moving laser for Laser Sintering process
I have used local cylindrical co ordinate system for locating center of laser on powder bed.
However the energy distribution in laser spot depends upon distance of node from the center of laser spot.
for every load step I need to calculate distance of each node from center and the compare it with laser dimension for application of heat
Can any body write a sample code for this purpose or any hint for how to do this?(any other approach is also welcome)
I am looking at understanding the way intensity data is collected and processed by the GLS-2000 scanner. From my understanding of intensity, as a representation of target reflectance, the value for intensity should decrease with the increase in distance and similarly with the increase in incidence angle.
So at 10m you might expect to have a higher intensity value than at 30m because more of the energy from the emitted laser pulse has returned to the scanner at 10m, and at 30m the value would be lower as the laser has lost power over the increased distance. Similarly with increasing angles less laser light is reflected back so the value for intensity decreases as the angle increases.
This has proven true in my testing with the GLS-2000 in the case of increasing angles. But it is not the case with increasing range. Which is what I want to better understand.
Do you know why it would be the case that the intensity values are higher at greater distances? Is the scanner performing some sort of scaling or normalization of the intensity data? I know that some instruments have automatic gain control and other such processes that can alter the intensity values. Do you know if the GLS-2000 scanner does anything like this?
Similarly I know that some software packages (like AutoDesk ReCap, and Trimble RealWorks) perform their own normalization and corrections to intensity. I am using Scan Master to process my data. Do you know if Scan Master is performing additional scaling or changes to intensity?
And is there any way that I can look at or interrogate the raw data from the scanner before bringing it into Scan Master? I have tried looking at the raw data but it is all in code that I don't understand.
Answers to any of these questions would be appreciated.
In your opinion what would be the optimum optical scanner for elliptical scanning trajectories (general elliptical, i.e. from line to circular in different sizes).
Which current solutions would you suggest for compact and fast response scanners (1KHz) other than e.g. classical salvo scanners?
Thank you in advance.
I am using the Topcon GLS-2000 laser scanner. The recorded intensity values from this instrument do not follow the typical trends of intensity. Whereby intensity should decrease as range to the target increases.
In the case of the Topcon GLS-2000 laser scanner the intensity values are increasing as the range to the target increases.
Why is this the case?
I believe it may be as a result of a logarithmic amplifier being applied to the intensity returns by the GLS-2000 scanner but I am not certain. Would this explain the boosted intensity values at higher ranges?
Any relevant information on relating to this issue would be greatly appreciated.
i am interested in first how can fabricate the set up in which wire is moving at high speed ,and then by using laser scan micrometer how can measure the outside diameter of wire
I have recently found an image of a billet steel scanned with laser triangulation method. Image provided pretty entertaining test target for my image processing hobby but I obviously have no rights to use it in any professional or scientific way. Not to mention one image is not enough to do any meaningful research. That is why I am looking for a library of free or paid images with steel scans?
You can see the image under link below, Obr.1:
Thanks a lot!
I am looking for laser scanner for 2D measurement of profiles. The cost of the sensor no doubt depends on its specifications. So let's say for FOV < 20 cm, range < 40 cm, resolution < 1000 points.
What adjustments should i use to get proper pictures. Our confocal Laser Scanning microscope is the LSM 510 Meta from Zeiss, Germany.
Excitation/emission: 460/500 nm
My Problem is, that i am not sure if see background fluorescent or if these tiny dots are my particles.
These are my used parameters:
Laser: 488 (20%)
pinhole: 504 µm
Gain (Master) : 786
Digital Gain: -0,88
I am looking for information about using techniques other than typical surveying. I found publications about using airborne laser scanning, photogrammetry (also from UAV), but maybe there are some implemented solutions in program of monitoring of technical condition of levees. Links appreciated.
I have 2 different laser scanning systems observing the same target, and each system observes and records a full waveform 'intensity' profile. Profiles recorded by each system may be similar or different, based on a number of variables.
Given neither profile is likely to conform to any predefined distribution (i.e. Gaussian, Poisson, etc.), and that each profile has the same number of observations, what is the best way to quantify if they are statistically similar?
Hey I want to buy 3d printer for medical purpose (orthopedic implant manufacuring), in detail i want to say that printer may be used for student experimental purpose as well as research purpose.
1-Please suggest me which printer should I go for and what should be the material used for printing implant.
Is their any combo machine through which I can print implant for demo purpose as well as research purpose.
2- and what about laser sacnner which should be used for same implant scanning and bone sacnning.
suggest model by which i can scan the longest and widest human bone.
We are planing to use oil red 0 (OR0) in terms of showing which part of skin our microemulsions (ME) and ME based Gel formulations are being trapped by using laser scanning confocal microscope. Is there anybody can help us finding a protocol for this procedure?
Also, do you think it would have disadvantages using previously removed rat skin for this procedure as well?
Thank you very much in advance.
I am working of simulation for Selective Laser Melting(Additive Manufacturing). Simulation takes a powder layer of a metal typically of thickness 50um. Subsequently a laser beam (Gaussian ) scans a particular geometry. Powder melts to give molten metal and on cooling molten metal solidifies to metal that have different density(Implies solidified metal have different properties than initial powder taken). On starting I am simulating with spot laser scanning. I am having difficulty implicating how can we change properties of solidified metal while working with Heat transfer with Phase Change (Phase-1 Powder Phase-2 Molten) and solidified metal is having properties different then Phase 1 (There is basically volume shrinkage/density change between Phase-1-Powder and Solidified Metal)
Thank You in Advance :)
I have access to laser scans of tunnelsections before and after spraying the tunnel with shotcrete. Hence the first point cloud represents the geometry of the rock surfaces and the other point cloud represents the surfaces of the shotcrete.I would therefore like to use the pointcloud data to build a solid element to import in Abaqus for analysis.
I've tried to use programs such as VRMesh, Meshlab and Autocad and can easily create individual surfaces from the pointclouds, on for the rock surfaces and one for the shotcrete surface. I've so far been unable to join the surfaces to create a solid element. Booth surfaces are higly irregular so when i try to extrude one of the surfaces to create a solid element the geometry will clash into each other.
Any suggestion how to solve this problem?
I am using sick laser scanner to make a map of an environment. The scans are recorded with time information. But the co-ordinates and reference point is ambiguous and not fixed.
I have an idea which may achieve ultra-high speed 2D (even 3D) laser scanning with scan frequency upto 10GHz. It means that within time of 100ps the laser focal spot can be moved round a circle or just from one place to another and returned according to your design. But I don't know what it can be used for.
As far as I know, the scan frequency of existing laser scanning techniques can be only up to several MHz. If my idea can be achieved, it will be a great improvement. So who can tell me potential applications of such a technique? OCT, Lidar or Confocal laser scanning microscopy?
I am developing Obstacle Avoidance Algorithms for MAVs as a part of my Masters Thesis. Can you please help me how to model the Laser Range Finder/Scanner Model in MATLAB for this purpose. How does one simulate Obstacles and How does one detect them using this Laser range finder Model? I will be highly thankful to you for your help. Thanks. Regards
Murali Mohan Gade
I am looking for data description, links to data browsers including data collected by national institutions in other countries over the worlds.
What are their parameters?
How often they are collected usually?
Is there any official data browser?
For example, in Poland, LIDAR of whole country with an average density of 4p/m2 and 12 p/m2 (for big cities) has been almost collected (90%). Link to the availability of data (DSM, DTM, LAS datasets) http://skorowidze.codgik.gov.pl/nmt/
Aerial photos are obtained every 2-3 years for whole country with a resolution of 10 cm (for big cities) and 25 cm or 50 cm for agricultural regions (depending on the size of real-estates) Link:
I'll be grateful for the assistance and support information about situation in your countries.
We are planning to carry out some continuous landslide monitoring using a terrestrial laser scanner. We want to install the scanner in the field and leave it there for some months to carry out daily measurements.
Has anyone tried this before and can share some experiences? One thing that would be particularly interesting for me is how to protect the scanner (e.g. from vandalism).
Our initial plan was to use a small shed from the hardware store where we install a small hatch that can open and close by a simple garage door opener controlled by a timer clock. What do you think about this simple and cheap solution? Do you have any better ideas?
I am looking forward to your comments.