ZapFREE® MRI Safe Linear Incremental Sensor
The MR343 series Fiber Optic Linear Incremental Position Sensor is an innovative all-optical, passive design which is immune to any electro-magnetic interferences such as magnetic fields, lightning and high voltages. The sensor’s non-metallic construction makes the sensor entirely MRI safe, being both immune and invisible to magnetic fields.
In operation, the MR343 Linear Position Sensor is optically connected to an MR340 Controller via a duplex multimode fiber optic link. An incremental film strip passes through the optical pick-up and the phase offset of two light beams create the classical A/B quadrature signals accessible via the controller interface.
As an incremental system, the absolute position must be set every time the system is powered up. To automate this process, Micronor has developed a special “homing” zone left or right of the film’s active area. In operation, the mechanical system starts up in the “homing” zone and moves towards the first line in the active area. This corresponds to the reference or index position on a conventional encoder. As the sensor moves into the active area, the counter can correctly track the absolute position.