Question

For highly accurate incremental position measurement which one of the following systems is used?

• A. Ultrasonic devices
• B. Hall effect Sensors
• C. Microwave devices
• D. Light interference laser

Hint:

For sub-micron or nanometer-level positioning tasks, laser interferometry is the go-to solution due to its extremely high precision.

Answer 1

The Correct Option is D

Incremental position measurement requires very precise determination of small changes in position. Light interference laser systems, also known as laser interferometers, are widely recognized for delivering the highest levels of accuracy and resolution in such measurements.
They operate based on the principle of interference between two coherent light beams. A reference beam and a measurement beam are superimposed, and the resulting interference pattern is used to detect even nanometer-scale movements.
Let’s briefly evaluate the other options:
- Ultrasonic devices are used for distance and presence detection but lack the fine resolution required for incremental positioning.
- Hall effect sensors are used in magnetic field detection and rough proximity/position applications, but not for ultra-precise measurements.
- Microwave devices offer long-range detection but are unsuitable for high-accuracy incremental measurements.
Thus, light interference laser systems are the best choice for highly accurate, fine-scale incremental position measurement.