Exposure Control By Light Source Strobe - Dalsa Linea HS Series Manual

Responsivity and noise performance can be assessed using a stationary plain white target under
bright field illumination or by using no target for rear bright field illumination.
To accurately evaluate the camera's responsivity and noise performance it is important that the
camera setup is representative of the system configuration.
The ideal test setup meets the following conditions:
 The lens is in focus, at the desired magnification, and with the desired aperture.
 The illumination intensity is equal to that of the Automatic Optical Inspection (AOI) system
and is aligned with the camera's field of view.
 The camera is operated with an exposure time that will allow the maximum line rate of the
system to be achieved. The camera's internal line rate generator and exposure control can
be used for a stationary target.

Exposure Control by Light Source Strobe

Relevant Features: outputLineSource, outputLinePulseDelay, outputLinePulseDuration, LineInverter
Note: TDI sensors do not have exposure control built into the sensor. The pixels are continuously
converting photons to electrons. For the first 678 ns after the falling edge of EXSYNC, the sensor is
sampling the reset level. Then, for the next 889 ns, it transfers the charge out of the pixel. During
this time it is still converting photons to electrons. If you are using strobe lights, you may want to
delay them coming on until after the charge transfer is complete—i.e., after 1.567 µs.
Using the GPIO controls the camera can be set up to strobe a light source effectively giving
exposure control.
Camera Trigger
Sensor Trigger
Duration of Sensor Exposure
Output Line 3, 4, 5 or 6
The trigger signal entering the camera is routed to the sensor and also to each of the output
control features.
Each line can be delayed relative to each other line using the ExposureDelay feature.
Camera Performance and Features
Output Strobe Control Example
Trigger Delay
Output
Duration
Output
Delay
Figure 10 Strobe Timing

31