Glossary

AFI

AFI is short for "accordion fringe interferometry" the name given to the technique of measuring 3D objects with a volumetric interference illumination pattern.

Baseline

Distance between source and receiver for AFI 5000P and AFI 5000S systems.

Baseline calibration

A calibration that determines the parameters that locate the source in the receiver CSYST.

Calibration

A comparison of a measurement system or artifact to a standard of lower uncertainty which quantifies deviations and REPORTS them or makes ADJUSTMENTS to reduce them.

CCD

CCD is short for "charge coupled device." A CCD is one type of digital camera chip that records illumination intensity. AFI measurement systems use a CCD camera to record the laser fringe pattern as it illuminates a target object.

Characteristic

Any distinct, quantifiable attribute of a product, process or service.

CMM

CMM is short for "coordinate measuring machine." CMMs are the workhorse of the measurement industry. They employ a highly sensitive probe tip mounted on precision motors to physically touch objects to measure 3D coordinates. Maximum measurement speed is approximately 60 points/minute.

Coordinate system (CSYST)

A Cartesian grid in which the location of geometric features can be resolved.

Crossbar

The cylinder that connects the AFI 5000P's source and receiver.

Filter

DPI software: Filters take point clouds as inputs and transform them into some output. The process is not reversible like a mask.

Image

The output of the receiver is a two dimensional image.

Mask

DPI software: A mask takes point clouds and uses or unuses individual points according to some rule. Masks and filters are distinguished from one another in the following way: masks are reversible and filters generally are not.

Metrology

The science of measurement. Rulers, tape measures, protractors, CMMs, laser trackers and ladar systems are examples of metrological devices. Generally assumed to refer to high accuracy measurements.

Nominal

Pertaining to the intended or designed model or characteristics of an object.

Plate

Mounting plate associated with a crossbar.

Ring light

Light that surrounds the lens of the receiver used for the purpose of illuminating photogrammetry targets and calibration artifacts.

Pose

Position and orientation.

Receiver

The device used to capture images of a scene.

Scale bar

An artifact used by the AFI 5000P subsystems to calibrate the distance between scanned features.

Source

The device used to project fringe patterns on the object to be scanned.

Stitch

Process used to join two or more scanner views of a scene into a single view.