Laser encoder interfaces
Flexible laser interfaces for high resolution applications.
RPI20 parallel interface
The RPI20 converts 1 Vpp analogue quadrature signals from an RLE laser interferometer encoder system to provide ultra-high resolution (4096x interpolation) positional feedback in a parallel word format.
Features and benefits
- High resolution – up to 4096x interpolation of analogue quadrature signals
- Multi-axis solutions – availability of seven axis capability from one bus.
- Fast communications – with an input bandwidth of <6.5 MHz and a 36-bit parallel format output
- High accuracy – low SDE contribution (±0.5 nm)
Optional dual axis VME host board to enable to the RPI20 to be used in VME system architectures.
Specifications
| Resolution | 38.6 picometres (plane mirror system) 77.2 picometres (retroreflector system) |
| Maximum velocity | 1 m/s (plane mirror system) 2 m/s (retroreflector system) |
| Output signal | 36-bit parallel word |
| PMI | PMI | RRI | RRI | |
| Velocity | <50 mm/s | <1 m/s | <100 mm/s | <2 m/s |
| SDE* | 0.5 nm | 2 nm | 1 nm | 4 nm |
*Non-linearity error
RPI20 parallel interface
