Fiber-optic absolute position sensor is MRI-compatible

-August 26, 2013

The MR338 fiber-optic position sensor from Micronor provides absolute angular measurement from 0° to 360° with 13-bit (8192-count) resolution and multiturn tracking to 12 bits (4096 turns) for use in MRI (magnetic resonance imaging) and similar applications where transparency to high electromagnetic fields is required. A duplex multimode fiber-optic link connects the passive MR338 nonmetallic sensor to Micronor’s active MR330 controller installed outside the MRI area. The MR338 sensor requires no electrical power and houses no electronic components.

Long-distance sensing without interference at up to 300 meters is possible with the absolute rotary encoder system. The MR330 controller transmits a burst of light to the code disk in the sensor, which modulates the spectral components of the light based on angular position. Position information is imprinted in the optical spectrum of the light and guided back to the controller for precise position readout. Built-in controller interfaces include SSI, USB, RS-485, RS-232, Modbus, digital, and analog.

MR338 datasheet


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