MR-Sensors

Where do you use MR-sensors?

MR-sensors, evaluation electronics and magnetic scales from Sensitec are in use everywhere, where movement is being controlled and steered, where paths, angles, positions, electric or magnetic fields are measured and detected.

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What is the MR effect?

The MagnetoResistive Effect, "MR-Effect", has been known for 150 years. However, its use in sensor applications was first made practically possible through the development of thin-film technology some 30 years ago.

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You will find us

… at the following exhibitions and fairs.

Our exhibition team is looking forward to presenting you our new products and innovations and to giving you technical advice for your individual measuring application.

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Camera Technology

Professional film cameras are used in all weathers and in all places – even at the top of Mount Everest. At the same time the camera must be light and must withstand rough handling. This places special demands on the sensors used to measure position or angle, which are particularly well fulfilled by MR-based sensors.

Typical Applications:

  • Integrated angle measurement system for objective
  • Rotary encoder for camera swivelling head

APPLICATION EXAMPLE: RECORDING OF APERTURE, FOCUS AND ZOOM SETTINGS OF AN OBJECTIVE

Requirements

Information regarding aperture, focus and zoom settings must be stored on the film for subsequent processing, e.g. for digital intermediate or CGI. To store this information a special encoder is needed within the objective.

Key Specifications

Period:
1 mm incremental track
Coding:
The reference and objective information is stored on a 2nd track
Accuracy:
< 2°
Resolution:
10 µm
Temperature range:
-20 °C up to +120 °C

Solution from Sensitec

A sensor of the AL600 family with FIX PITCH design with 1 mm pitch and an angle sensor of the AA700 family with FREE PITCH design for scanning the code track are used. A flexible polymer-bonded ferrite scale is used as the measurement scale.

Why use MR sensor technology?

  • Simple assembly and adjustment
  • No further calibration necessary after final assembly
  • A and B signals with 90° phase shift are generated by a single sensor element
  • Incremental and code track sensor are mounted on a single board
  • Measuring distance is only dependent on the length of the scale