Tutorial 13 - Flame Detection Multi-Point Method


Detect3D Fire and Gas Mapping Tutorial 13 Cover


This tutorial will go over the Multi-Point Method for flame detector positioning.


The Multi-Point Method provides an alternative technique for calculating coverage. Instead of the zone being filled with points in space, it is instead filled with a group multi-point region (MP Region) defined to a set size. The MP Region can be used to represent the size of fire you want to detect, however other applications are also possible. The coverage of the MP Region is determined by the number of points within the MP Region that are visible to the detector. Just like for the point method, the MP Region may be out of range of the detector or obscured by CAD objects.


The amount of the MP Region visible to the detector determines its coverage. The amount of the MP Region required to be visible to the detector depends on how far away it is from the detector. It is assumed that 100% of the MP Region must be visible at the detector’s maximum range, but this number reduces based on the inverse square law. Thus, at half the maximum range of the detector, only 25% of the MP Region is required to be visible. Please refer to the Multi-Point Method vs Point Cloud Method section and the Inverse Square Law Tutorial for more information on how this is calculated.


The advantage of the Multi-Point Method is that it reduces very small areas of zero coverage that can appear when using the Point Method. For example, if the target fire size is 1ft x 1ft, then zero coverage areas in the Point Method that are 0.1 ft (as an example) are not really zero coverage because the fire is larger than that region. By contrast, these very small zero coverage areas would be eliminated by the Multi-Point Method.


In general, coverage is improved by using the Multi-Point Method, however there are cases where the reverse is true.


If you have any questions about the Multi-Point Method, please email us at info@insightnumerics.com



Learning objects for this tutorial include how to:

  • Apply the Multi-Point Method to a zone in Detect3D

  • View resulting coverage results from the Multi-Point Method

  • Add and view isovolumes for zero coverage areas when using the Multi-Point Method


Files used in this tutorial:


Contents of Tutorial 13: