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HA0373T Rev Ck May 2017
Chapter 4
4.2.6
Sensor Data Precision
The precision of the beam alignment data for a sensor is dependent on the beam size,
beam geometry, and beam power density characteristics. Given a beam size and
geometry that fits within the recommended diameter of the sensor, a zero value for
both the X and Y difference signals indicates the beam is centered with respect to
power density (i.e. the center of power) which may not be the geometric center of the
beam.
Apart from beam alignment, the actual beam position relative to true alignment can only
be determined if the beam size, beam geometry, and beam power density gradient are
well understood. Beam alignment is best achieved for a stable circular beam with a
diameter as stated above, and a uniform power density over the beam area.
4.2.7
Temperature Considerations
The operating temperature must be between 10 to 40°C. For best resolution, the
temperature should be kept at or below 25°C. Thermal gradients across the detector
will cause position errors and should be avoided.
