Laser Scan
Laser Scan
laser Scan

 

Introduction

Highlighted terminology is explained at the bottom of the page.

We offer our clients the latest technological methods to both accurately and scientifically, analyse and record the collision environment, collision site road geometry, collision-involved vehicles, and any other collision-related objects through the use of 3D laser scanners.

3D lasers scanners are separated into contact and non-contact devices, with non-contact devices being used for forensic collision investigation. The non-contact 3D laser scanning devices CollisionExperts use are based on time-of-flight analysis. Time-of-flight 3D lasers scanners have large ranges with accuracies typically less than +/- 2 mm.

3D laser scanners collect millions of individual point measurements, which are then plotted within a single XYZ coordinate system to form a point cloud of the collision site or other object being modelled. Digital images taken by the 3D laser scanner are used to recreate colour. Multiple point clouds collected from different viewpoints combine using common features to create one 3D dataset.

Crucial to any collision reconstruction is the ability and opportunity of a forensic collision investigation to objectively analyse the collision site, collision-involved vehicles and all other associated objects.

Not only do the resultant 3D datasets allow a forensic collision investigator to accurately measure from any one of the millions of points to any other one, but they also facilitate with other investigative activities. Most importantly, we use 3D datasets to objectively analyse potential collision factors, road user and witness sightlines, points of possible perceptions, crush deformation, road gradient, crossfall and profile to name only a few. Furthermore, the 3D dataset facilitates the production of scientifically accurate visualisations of road user approach paths.

It is imperative that the approach paths, sightlines and all factors of the collision sequence are considered when forming judgements of road user actions in litigation.

Furthermore, the 3D datasets provide the most objective and accurate component parts for the production of our scale plans, collision simulations and forensic animations.

The further benefits of 3D laser scanning include:

We strongly suggest that all our clients benefit from 3D laser scanning to maximise the credibility of investigative reconstructions.

 

Method of Operation

Most time-of-flight 3D scanners use laser light to probe the collision site and any other items being modelled. A time-of-flight laser range finder determines the distance of the surface of an object by timing the round-trip time of a pulse of light. The 3D laser scanner emits a pulse of laser which reflects off the surface on an object and the time period before the reflected light is seen by a detector is measured. The travel distance of the light is calculated by knowing the speed of light and the round-trip time, which is twice the distance between the scanner and the surface of the object. The accuracy of time-of-flight 3D laser scanners is determined by how precisely they measure time; as an example, a time interval of 3.3 picoseconds is the time taken for light to travel 1 millimetre. The 3D laser scanner scans its entire field of view one point at a time by changing the range finder's direction of view to scan different points.

 

Fees & Lead Times

Our service level agreements for fees and lead times for our 3D laser scanning services vary due to the complexity of each case and any additional investigative services required.

This service is part of our all-inclusive investigative reconstruction package.

Please contact us to discuss your requirements.

 

Terminology

3D Laser Scanner - A device that analyses an object or environment to collect data on its shape.

Approach Path – The geometric description of the course over ground of the collision-involved vehicles, objects or persons during the pre-collision phase.

Collision Environment - The settings, surroundings and conditions concerning a collision site at the time of a collision.

Collision Factor – An event, circumstance or condition relating to a collision scenario.

Collision-Involved Vehicle – A vehicle directly related to a collision.

Collision Scenario – The circumstances of a collision.

Collision Sequence – The chronological sequence of events involving the collision-involved vehicles, objects or persons.

Collision Site - The geographical location of a collision scene.

Crossfall – The slope at right-angles to the alignment of any part of the carriageway.

Crush Deformation – Distortion of a vehicle from its original dimensions.

Dataset - A collection of related sets of information that is composed of separate elements but can be manipulated as a unit by a computer.

Gradient – The tangent of the angle a road forms relative to the horizontal road plane.

Point Cloud - A set of data points in space.

Point of Possible Perception – The place and time at which a normally attentive road user could have first perceived the hazardous situation.

Road Geometry – The geometric design of roads concerned with the positioning of the physical elements of it according to standards and constraints.

Road Profile – The longitudinal side view of the road geometry.

Road User Actions – The ongoing activities of a road user during the pre-collision phase.

Road Users – Persons on the road including drivers, vehicle riders, pedestrians or passengers.

Sightline - A visual axis for a normally unobstructed line of sight between an observer and a subject of interest.

 

 

our Services

All Inclusive Service Collision Accident

All-Inclusive Investigation
Consultancy

Consultancy
Collision Reconstruction Collision Accident

Investigative Reconstructions
Desktop Analysis Collision Accident

Desktop Analysis
Claim Validation

Claim Validations
Vehicle Examinations Collision Accident

Vehicle Examinations
Laser Scanning Collision Accident

3D Laser Scanning
Forensic Animations Collision Accident

Forensic Animations
CCTV Digital Video Analysis Collision Accident

Digital Video Analysis
Collision Site Analysis Collision Accident

Collision Site Analysis
UAV Collision Accident

UAV Aerial Imagery
Collision Accident Computer Simulations

Computer Simulations
Collision Accident Vehicle Forensics Infortainment

Vehicle Forensics
Collision Accident Crash Data Analysis

Crash Data Analysis
Collision Accident Light Bulb Analysis

Lamp Analysis
Collision Accident Seat Belts

Seat Belt Examinations
Incident Analysis

Incident Analysis
Collision Accident Photography

Site Photography
Collision Accident Scale Plan

Scale Plans
Collision Accident Report Validation

Report Confirmations
Research

Research