The MAST Laboratory has one Krypton Coordinate Measuring Machine (CMM) system. The system consists of a camera, infrared Light Emitting Diodes (LEDs), and control hardware and software. Through triangulation, the system can calculate the 3D positions of up to 128 LEDs (MAST currently has 100 LEDs) in the camera’s 13.1 m³ field of view. Data sampling and archiving of the CMM system are synchronized with the DAQ system using TTL signals. The CMM system can be used to perform as-built verifications of specimens, generate metadata associated with sensor locations, and measure 3D displacements of the structural surface. MAST staff recommends that the user not solely rely on the Krypton system and take redundant data using a different type of sensor for important data.
CMM Manufacturer Specifications (units are shown in metric):
- Noise (1σ): 0.01 mm
- Field-of-view: 13.1 m³ distributed into three accuracy zones as shown in the following figure.
| Zone I | Zone II | Zone III | |
|---|---|---|---|
| Volumetric Accuracy | 90 μm + 10 μm/m | 90 μm + 25 μm/m | 190 μm + 25 μm/m |
| Single‑Point Accuracy | 60 μm + 7 μm/m | 60 μm + 17 μm/m | 130 μm + 17 μm/m |