32
•
Camera Operation
Linea CLHS Series Camera
Camera Control
Parameter
Description
Internal Line
Rate
Camera line rate in a range from 300 Hz up to 71 kHz.
This feature is only available when the camera is in Internal Mode (free
running): that is, the line trigger is disabled (
Trigger Mode
off).
Exposure Time
Source
Set the operation mode for the camera’s exposure. Trigger Width is only
available when Trigger Mode is enabled.
Trigger
Width
Uses the width of the current line trigger signal pulse to
control the exposure duration.
Timed
The exposure duration time is set using the Exposure Time
feature and the exposure starts with the Line Start event.
Exposure Time
Sets the exposure time (in microseconds). Exposure Time Source feature
must be set to Timed.
Internal Programmable Exposure
The camera in the Internal Programmable Exposure mode is the default free- running mode with
the external trigger off and internal exposure control. This mode is not synchronized to an external
signal. Line rate is the dominant factor when adjusting the line rate or exposure time. When setting
the line rate exposure time will decrease (if necessary) to accommodate the new line rate. When
adjusting the exposure time the range is limited by the line rate and has the following features:
•
The
Trigger Source
feature (see I/O Control category) selects an internal signal as trigger.
•
Programmable internal trigger, where the maximum line rate limit is related to the
Exposure
Time
feature.
•
Exposure duration is user programmable (exposure maximum is dependent on the line rate).
Minimum exposure (in µs) is model dependent.
Programmable Exposure
1
Programmable Exposure
1
Programmable Line Time
> 2
µ
s
Programmable Exposure
1
Sensor Readout
2
Sensor Readout
2
Sensor Readout
2
LVAL delay
3
LVAL
1.
Exposure time > 4
µ
s
2.
Sensor readout ti
µ
e = 2
0
.8
µ
s
3.
LVAL delay
=
41
µ
s
To calculate the maximum line rate:
Maximum line rate
=
1
(
𝑒𝑥𝑝𝑜𝑠𝑢𝑟𝑒
𝑡𝑖𝑚𝑒+𝑙𝑜𝑤
𝑡𝑖𝑚𝑒∗
)
*Exposure time must be greater than 4
µ
s, and low time greater than greater than 2
µ
s (16k
model)