Received Light Waveform And Measurements - Fastus LS Series User Manual

5.4.4

Received Light Waveform and Measurements

The heights of all the parts where the laser strikes the target are measured from the waveform. The
waveform is a vertical graph of the reflected light of the laser.
The following two settings are related to the recognition of the received light waveform. Normally you do not
have to change these settings.
Threshold
z z
If the amount of light of a part of the received light waveform is less than or equal to this setting value,
that part of the waveform triggers alarm (no measured value).
The unit is the received light amount (in 256 levels).
If you specify a value that is too high, the number of areas where measurement is not possible will
increase.
If you specify a value that is too low, noise components will also be measured, which may lead to
unstable measurements.
[1] The peak of the received light
waveform is greater than or equal
to the light amount threshold.
Light amount threshold
Measurement is possible.
Reject level
z z
Sets the range to measure when measuring the peak position of the received light waveform.
Use the reject level to specify what the lower percentage of the received light waveform to ignore during
calculations.
If you specify a value that is too high, the measured value may be unstable due to the surface status.
If you specify a value that is too low, diffuse-reflected light and noise will be measured, which may lead
to unstable measured values.
Ramco National
((Level of the received light
waveform) + 1)/128
Figure: Determining the area to use in calculations
800-280-6933 | nsales@ramcoi.com
[2] The peak of the received light
waveform is less than the light
amount threshold.
Alarm
This range is used in the
measurement calculation.
Camera Settings
5-15
www.Optex-Ramco.com