RCU10 real-time quadrature compensator
Compensation systems for real-time quadrature positional feedback.
When any laser interferometer system is used in a non-vacuum environment, some form of environmental compensation is required to maintain accuracy under varying environmental conditions. The principle of interferometry is dependent on the wavelength of the laser light, a figure which fractionally varies depending on the refractive index of the air through which it travels.
Environmental changes of ±1 °C in air temperature, ±3.3 mbar in air pressure, or 50% variance in relative humidity would generate a 1 ppm variance in laser wavelength and resulting measurements.
The input and output parameters for an RCU10 unit are configured with the Renishaw Configuration Software (RCU-CS). This can be downloaded from the link at the bottom of this page.
Features and benefits
- Accuracy – refractive index compensation for laser encoders using air pressure and temperature sensors, improves accuracy to within ±1 ppm.
- Yield enhancement – thermal expansion compensation of workpiece and machine structures, using material temperature sensors, dramatically improves process repeatability.
- Flexibility – RCU10 can also be used for compensation with many other laser and scale encoders that provide digital quadrature feedback signals.
|Refractive index compensation
Material expansion compensation
|Digital – RS422 quadrature
Analogue – 1 Vpp sine / cosine
|Digital – variable to 10 nm
Analogue – variable to 20 µm
|Up to 5 m/s
* plus the greater of 3 input counts and 1 output count for digital outputs and a further velocity dependant error for some analogue outputs.
A number of optional extras are also available for use with the RCU10 real-time quadrature compensation unit.
|Serial / USB adaptor
|Sensor distribution box
|Armoured sensor cable (5 m length)
|Air temperature transmitter
|Material temperature transmitter