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Laser Triangulation Sensors. RF602 Series
RF602 [Revision 1.2.0] 28.01.2019
10. Configuration parameters
The nature of operation of the sensor depends on its configuration parameters,
which can be changed only by transmission of commands through serial port RS232 or
RS485. The basic parameters are as follows:
10.1. Time limit for integration
Intensity of the reflected radiation depends on the surface characteristics of the
object under control. Therefore, the output power of the laser and the time of integration of
radiation incident onto the CMOS-array are automatically adjusted to achieve the maximum
measurement accuracy.
Parameter "time limit for integration" specifies the maximum allowable time of
integration. If the radiation intensity received by the sensor is so small that no reasonable
result is obtained within the time of integration equal to the limiting value, the sensor
transmits a zero value.
Note 1
. The measurement frequency depends on the integration time of the
receiving array. The maximum frequency (9,4 kHz) is achieved for the integration time 106
s (minimum possible integration time is 3 s). As the integration time increases above
106 s, the result updating time reduces proportionally.
Note 2
. Increasing of this parameter expands the possibility of control of low-
reflecting (diffuse component) surfaces; at the same time this leads to reduction of
measurement frequency and increases the effects of exterior light (background) on the
measurement accuracy. Factory setting of the limiting time of integration is 3200 s.
Note 3
. Decreasing of this parameter lets to increase the measurement frequency,
but can decrease the measurement accuracy.
10.2. Sampling mode
This parameter specifies one of the two result sampling options in the case where
the sensor works in the data stream mode:
·
Time Sampling;
·
Trigger Sampling.
When
Time Sampling
is selected, the sensor automatically transmits the
measurement result via serial interface in accordance with the selected time interval
(sampling period).
When
Trigger Sampling
is selected, the sensor transmits the measurement result
when the external synchronization input (IN input of the sensor) is switched and taking
the
division factor
set into account.
10.3. Sampling period
If the Time Sampling mode is selected, the ‘sampling period’ parameter determines
the time interval in which the sensor will automatically transmit the measurement result. The
time interval value is set in increments of 1 s.
If the Trigger Sampling mode is selected, the ‘sampling period’ parameter
determines the division factor for the external synchronization input.
For example
, for the
parameter value equal to 100, data are transmitted through bit-serial interface when each
100th synchronizing pulse arrives at IN input of the sensor.
Note 1
. It should be noted that the ‘sampling mode’ and ‘sampling period’
parameters control only the transmission of data. The sensor operation algorithm is so built
that measurements are taken at a maximum possible rate determined by the integration
time period, the measurement results are sent to buffer and stored therein until a new result
