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Fiber Optic Sensors

Photonics Spectra
Jun 2014
Micronor Inc.Request Info
 
Micronor Inc. has introduced the Model MR330 fiber optic absolute position sensor with an all-optical design immune to electromagnetic interference (EMI) such as lightning, radiation and magnetic fields. The fiber optic aspect of the sensor makes it suited for long-distance position sensing over hundreds of meters without being affected by ground loop problems.

The sensor 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, 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.

The MR330’s accuracy and EMI immunity make it suitable for use in 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 classified as a “simple apparatus” and meets ATEX requirements for use in mines and other hazardous environments. Its immunity to lightning makes it suited for outdoor applications such as wind turbines and antennas.

It measures absolute angular position from 0° to 360° with 13-bit (8192 count) resolution at speeds ≥2500 rpm. The fiber cable used is industry-standard 62.5-/125-µm multimode fiber with duplex LC connections. The controller is powered by a 24-VDC supply and features multiple built-in interfaces and protocols for position readout, making it compatible with most motion systems.

The controller’s powerful embedded processor and firmware offer an extended set of built-in functions, and the Model MR330-1 SSI controller offers SSI, USB, RS-485 Serial, Modbus RTU, two analog outputs (4 to 20 mA and ±10 V) and two digital set points.

Special versions can be engineered for radiation environments, MRI applications and OEM product integration.


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