56
Measurement Types
The MViQ system supports four types of measurement: 3D Phase,
3D Stereo,Stereo, and Comparison.
Type
Advantages
Considerations
3D Phase
Over stereo or comparison measurements:
• Optical tip used to view and measure.
• Range Finder calculates proximity
to a given surface as an aide to
measurement.
• Full screen view.
• More accurate depth measurements.
• Cross-section profile view and measure
• Does not require surface detail
• The surface need not be perpendicular
to the tip.
• 3D point cloud view
• OTA serial number automatic recognition.
• The system cannot measure moving
parts.
• Must measure highly reflective
surfaces at an angle.
• Only available on 6.1 mm probes
3D Stereo
Over stereo
• Split screen 2D + 3D point cloud view for
simpler assessment of measurement
quality.
• Reduced measurement variation.
• Supports Depth Profile measurements.
Over 3D Phase
• Less sensitive to probe movement during
capture.
• May perform better on shiny or concave
surfaces.
• Available on all probe diameters.
• Same split live image as stereo.
• Requires surface detail to generate
3D data.
• May not perform as well as stereo
on highly irregular discontinuous
surfaces.
• Uses same OTA's as Stereo.
Stereo
Over comparison measurements:
• More accurate.
• No known reference is needed.
• Can measure depth.
• The surface does not need to be
perpendicular to the probe view.
The system may be unable to position
the matching cursors accurately
with any of these conditions in the
measurement area: insufficient detail,
repeating patterns, glare, or smooth,
straight lines to measure along.
In some cases, you can eliminate
the problem by repositioning
the probe tip and adjusting the
Brightness and/or Dark Boost.
Comparison
Over stereo measurements:
• Use the probe headguard or any other tip
optic.
• Measure with probe tip farther away.
• Measure large objects.
• Check approximate size of many items
quickly
• Distortion Correction allows for
measurement across the entire scene..
• Less accurate than stereo
measurements.
• Known references may not be
present and may be difficult to
deliver to the measurement site.
• Measurement surface must be
nearly perpendicular to the probe
view for an accurate measurement.
Measurement OTA's
Note: 3DPM OTA's are automatically identified by the system. Stereo OTA's must
be manually selected prior to making a stereo measurement. Although 3D
Stereo and Stereo use the same stereo OTA's, they require different factory
calibration processes and calibration data. They also utilize different processing
to determine 3D coordinates for measurement.
Unlike standard OTA's, Stereo, 3D Stereo, and 3D Phase OTA's are factory-
calibrated for use with specific probes and will not measure accurately with
other probes. These OTA's are matched to probes by the serial numbers
identified on each OTA and each probe label. Calibration data is stored in
memory in the probe, allowing the probe to be used with different handsets.
Notes:
-To ensure measurement accuracy, verify the OTA's accuracy each time it
is installed and at the end of a measurement event. Refer to
Appendix E
for
verification procedures.
-The installed OTA must be identified before making Stereo measurements.
Click
here to view stereo tip identification procedure
.
To ensure that no mechanical damage has degraded their accuracy, verify
measurement OTA's each time you use them. See Verifying Measurement
OTA's in
Appendix E.
To learn which OTA's are available for each measurement
technique, see the Optical Tip Table in
Appendix B.
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