- Master-axis accuracy: <0.6 microradian (<0.12 arc-second)
- Minimum incremental step: 0.035 microradian (0.007 arc-second)
- Angular measurement uncertainty: <0.73 microradian, k=2 (<0.15 arc-second expanded uncertainty, k=2)
Aerotech’s Angle and Rotary Calibration system, the µARC, sets a new industry standard of performance for angle and rotary device calibrations requiring long-term stability and angular accuracy of <1 microradian (0.2 arc-second).
The system was designed for applications requiring ultra-precision measurement capability with step sizes ranging from less than 0.1 microradian to continuous rotation. Applications include calibration of angle encoders, sensors, indexing tables, polygons and optical prisms. Electro-optic imaging sensors such as IR cameras, satellite imagers and spectrometers can be rotated on this device relative to a collimated target to test sensor properties such as field of view, pixel resolution and lens distortion.
The entire instrument is built on a precision granite machine structure that is isolated from the machine base and floor through passive air isolation. A custom enclosure isolates the system from air turbulence, high-frequency thermal fluctuations and ambient light. System electronics are packaged in a way to keep heat and electrical noise away from the sensitive measurement areas.
Air-Bearing Rotary Master Axis
At the heart of the µARC system is the ABRT-400 – a large rotary air-bearing axis with nanometer-level error motion performance. This high-accuracy air-bearing master axis is constructed of steel to closely match the CTE of the surrounding granite structure. The air bearing is equipped with a non-influencing rotary union and slip ring to pass vacuum or air and electrical service to the device under test. The ABRT-400 can be used as the angular standard in high-accuracy measuring machines, x-ray diffraction, protein crystallography or high-precision machining applications.
The µARC system is controlled by Aerotech’s A3200 motion controller. A customized menu-driven interface provides the user with easy control of the test procedure and plot/report generation, shifting focus to the performance of the Device-Under-Test (DUT) instead of machine operation. The system can be easily programmed to perform multiple unidirectional or bidirectional test cycles and can capture position data at rates up to 8 kHz during motion to correlate position or velocity versus a DUT output.
Angle and Rotary Device Calibrator Specifications
|Accuracy||0.12 arc sec|
|Repeatability||0.08 arc sec|
|Axial Error Motion (Synchronous)||<50 nm|
|Radial Error Motion (Synchronous)||<75 nm|
|Tilt Error Motion (Synchronous)||<0.1 arc sec|
|Axial Error Motion (Asynchronous)||<10 nm|
|Radial Error Motion (Asynchronous)||<10 nm|
|Tilt Error Motion (Asynchronous)||0.01 arc sec|
|Load Capacity Axial||200 kg|
|Load Capacity Radial||50 kg|