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MRI compatible absolute rotary encoder with 13-bit resolution

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article image Micronor MR330 series absolute encoder system

Micronor introduces a new fibre optic absolute rotary encoder featuring 13-bit resolution and designed for use in functional MRI research, MRI training phantoms, EMC test facilities and various challenging electromagnetic environments where EMF and RF transparency is required.

The world's first commercially available MRI-compatible fibre optic absolute rotary encoder system, the all-optical, non-metallic MR338 passive sensor provides precision absolute angular measurement from 0° to 360° with 13-bit resolution and 12-bit multi-turn tracking. A duplex multimode fibre optic link connects the passive MR338 sensor to the active MR330 controller module installed outside the MRI area. 

The Micronor MR330 series absolute encoder system uses an innovative patented optical technique. The controller transmits a burst of light to the code disk in the sensor, which accurately modulates the spectral components of the light based on angular position. The position information is imprinted in the optical spectrum of the light and guided back to the controller for precise position readout. The sensor requires no electrical power and houses no electronic components. 

Model MR330-1 SSI controller's powerful embedded processor and firmware offer performance plus extended set of built-in functions and interfaces not available with resolvers or conventional electronics-based encoders. Built-in interfaces include SSI, USB, RS485, RS232, Modbus RTU, programmable digital set points and analogue outputs (4-20mA and ±10V). The DIN-rail mount module operates from 24 VDC and supports encoder links extending up to 2500 metres. 

Complementing Micronor's MR328 MRI incremental rotary encoder introduced three years ago, the MR338 MRI absolute position sensor is ideal for MRI applications requiring precision monitoring of absolute angular position. The MR328 incremental encoder provides 360ppr resolution and A/B quadrature (pulse) outputs for monitoring speed and relative position tracking requirements. 

Linear encoders are currently in development.

Micronor is represented in Australia by Quality in Control .

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