Maximum Line Speed and Exposure Time Calculations
Product Reference Guide
133
Maximum Line Speed and Exposure Time Calculations
The
Exposure Time
(or Shutter) parameter defines the time during which the
image will be exposed to the reader sensor to be acquired. This parameter
depends heavily on the environmental conditions (external lighting system,
image contrast etc.).
In general, a longer time corresponds to a lighter image but is susceptible to
blurring due to the code movement; a shorter exposure time corresponds to a
darker image.
NOTE
Assuming:
• X: Code Resolution (mm)
• T
exp
: Exposure Time (s)
• LS: Line Speed (mm/s)
The essential condition to avoid blurring effects between two adjacent elements
in a dynamic reading application is:
LS
T
exp
X
The maximum (theoretical) line speed LS can be calculated as follows:
X / T
exp (min)
= LS
(max)
T
exp
(min)
is the minimum
Exposure Time
value obtainable for the specific
application. It can be evaluated in static reading conditions and depends on the
Matrix reader model selected for the application (internal lighting system, optical
lens, reading distance) and on any external lighting system. It may also depend
on code printing quality, and reader position.
Example:
A Matrix 300N using:
Internal Lighting Mode = Very High Power Strobe
Exposure Time = 100
s
Code Resolution (X) = 0.254 mm (10 mils)
has a maximum line speed of:
0.254 (mm) / 0.0001 (s) = 2540 mm/s
The following considerations must be applied only when the internal lighting system
and 2D codes are used. The Maximum line speed allowed for linear codes or postal
code reading applications heavily depends on the direction of symbol movement.
When the direction of movement is parallel to the elements of the code, the maxi-
mum speed is greater.
Summary of Contents for Matrix 300N
Page 1: ...Matrix 300N Product Reference Guide Image Based Reader...
Page 72: ...Installation 56 Matrix 300N Figure 28 Mounting Bracket Overall Dimensions mm inch...
Page 91: ...Inputs Product Reference Guide 75 Figure 48 NPN External Trigger Using Matrix 300N Power...
Page 153: ...Reader Configuration Product Reference Guide 137 Figure 84 Decoding Results OK...
Page 180: ...ID NET Master ID NET Slave 1 ID NET Slave 1 Software Configuration 164 Matrix 300N...
Page 182: ...Software Configuration 166 Matrix 300N Open the cloned application job...
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