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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.
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.
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.
Medical Technology
MR-based sensors are used in a wide variety of applications in medical equipment. Position sensors are used to measure distance or position in optical devices, such as microscopes, while field measurement sensors are used in new diagnostic applications such as biosensors or in laboratory automation equipment.
Typical Applications
- Linear encoder for optical biometry
- Diagnostic device for cancer detection Linear encoder for micro-manipulator of a microscope
APPLICATION EXAMPLE: Linear encoder for ophthalmological device
Requirements
The measuring device is used to make measurements between the lens and cornea of the eye when treating cataracts.
Key Specifications
- Stroke:
- 40 mm
- Resolution:
- 2 µm
- Accuracy:
- ± 5 µm
- Linear speed:
- 0.2 m/sec
Solution from Sensitec
- A PURE WAVE sensor of the AL600 family with pitch length 0.5 mm is used to scan the incremental track of a hard ferrite measurement scale
- A digital hall sensor is used for the reference signal
- An interpolation circuit provides a resolution of 248 pulses, representing a linear resolution of better than 2 µm
Why use MR sensor technology?
- Simple adjustment
- No further calibration necessary after final assembly
- No mechanical wear in the measurement system
- Quasi-absolute position signal by means of the index track
- Service signals on a second connector for easier assembly