Bullet Sensors & Transducers e-Digest, Vol. 129, Issue 6, June 2011: Product News

    (ISSN 1726-5479)



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World's First Absolute Fiber Optic Position Sensor with EMI Immunity, Lightning Resistance and 13-Bit Resolution



Newbury Park, CA USA - The Model MR330 series position sensor is an innovative all-optical design immune to any electro-magnetic interference such as lightening, radiation, magnetic fields and other harsh environmental conditions. The fiber optic aspect of the sensor also makes it perfectly suited for long distance position sensing over hundreds of meters without being affected by ground loop problems.


"The uniqueness of the system is that the sensor is entirely passive - meaning that there are no electronic components whatsoever in the unit, " says Robert Rickenbach, Chief Engineer for Micronor. "The result is that the sensor can be directly deployed in extreme environments where conventional electronic encoders have distinct limitations."


The new absolute FOPS uses a novel 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 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 a precise position readout. The sensor requires no electrical power and houses no electronic components whatsoever.


The MR330's accuracy and EMI immunity make it an ideal sensor for applications that require precise motion control and position measurement in challenging environments: oil rigs, satellite antennas, solar panel arrays, actuator systems, transportation systems, steel mills and medical instrumentation. The sensor is also classified as a "simple apparatus" and meets ATEX requirements for use in mines and other hazardous environments. The sensor's immunity to lightning make it especially suited for outdoor applications such as wind turbines and antennas.


This innovative product measures absolute angular position from 0 to 360 with 13-bit (8192 count) resolution at speeds exceeding 2500 rpm. System firmware also tracks turns up to 12-bits (4096 revolutions).


A complete system consists of the MR332 Passive Sensor, and MR330 Controller which interconnect via a duplex fiber optic link. The fiber cable used is readily available industry standard 62.5/125m multimode fiber with Duplex LC connections. The controller is powered by 24 VDC and features multiple built-in interfaces and protocols for position read-out making it compatible with most any motion systems. The Model MR330-1 SSI Controller offers SSI, USB, RS485 Serial, Modbus RTU, two analog outputs (4-20 mA and 10 V) and two digital set points.


The debut of the MR330 series absolute position sensor complements Micronor's existing MR310 series incremental fiber optic encoder system. Micronor's newly expanded range of fiber optic rotary sensors ensures the right solution is available for those applications where conventional electronics-based encoder or resolver performance falls short.



About Micronor


Since 1968, Micronor has been a leading global supplier of automation and motion control products for industrial applications as well as military, aerospace, medical and other harsh/hazardous environments. Products include fiber optic sensors, encoders, resolvers, rotary limit switches, motorized potentiometers, pulse generator, and custom engineered feedback and control units. Micronor has facilities in California-USA and Switzerland.





Dennis Horwitz

Vice President, Sales & Marketing

Micronor Inc.

750 Mitchell Road

Newbury Park, CA

91320 USA

Tel.: +1-805-499-0114, fax: +1-805-499-6585

E-mail: dennis@micronor.com

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