The Micronor MR330 Series fiber optic absolute position sensor system from Micronor (Newbury Park, CA) features 14-bit single-turn resolution. Rotary sensors are offered in two models: Standard MR332 and MRI Safe MR338. The absolute rotary encoder measures absolute angular position from 0° to 360° via programmable 13-bit (8,192 count) or 14-bit (13,950 count) resolution at speeds exceeding 2500 rpm. System firmware also tracks turns up to 12 bits (4096 revolutions). The controller features multiple built-in interfaces: SSI, USB, RS485 Serial, Modbus RTU, two analog outputs (4-20mA and ±10V), and two digital set points.

The position sensor is an all-optical design that resists electromagnetic interference such as lightning, radiation, magnetic fields, and other harsh environmental conditions. It uses an optical technique embedded in a passive sensor and active controller connected by a duplex fiber optic link. The controller transmits a burst of light to the code disk in the sensor that 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 position readout. The sensor requires no electrical power and houses no electronic components.

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Motion Control & Automation Technology Magazine

This article first appeared in the June, 2014 issue of Motion Control & Automation Technology Magazine.

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