Occupancy Soloutions

 

Edmond Electronics Applications Guide

ISP 30060 issue 1

PEOPLE COUNTER APPLICATION NOTE

Key Principles:

• Hot Bodies emit Infra-Red (IR) Radiation.
• Heat behaves like light;optical principles apply.
• Invisible to the human eye.
• Moving Hot bodies detected.
• Stationary bodies not detected.
• Hot bodies visible even in complete darkness.

IRISYS Technology:

• 16x16 Array of Passive IR (PIR) Detectors.
• Moving Persons seen as ‘Hot Blobs’.
• Static Background not seen.
• Insensitive to light level variation.
• IR transmission through mist & fog.
• IR not transmitted through glass.
• Universally Applicable when carefully installed

The Field of View

What the Counter ‘Sees’

Outputs

• Relays Click & Count only increments when a target crosses selected line & exits scene .
• RS232 data output; Count & Array Data output to allow scene visualisation .
• LEDs flash when target crosses selected line, as an aid to installation .
  

The Principles of Detector Installation

• Visualise the detector as describing a 60 ° solid pyramid in space.
• Detection Square on Floor ≡ Mounting Height (i.e. width=height) for estimation purposes.
• Ensure a Clear Field of View.
• Ensure space for target to be detected before count line is crossed for initialisation.
• Operation limited to moving targets (not queues or static scenes).
• Counting efficiency decreases at high crowd densities (which may fill the scene).
• Mounting height range 2.5-4.5m . (May be less than 4.5m in poor environmental conditions).
• Ensure a static background (Avoid tops of escalators or areas of modulated sunlight).
• Avoid Obstructions which mask the approach & avoid doors which open in to the scene.

Example Screen of occupacy Front End