Discussion
Consider the following pairs of sensor and operating principle:
Ring laser gyro - Frequency difference between counter-rotating beams
Fibre optic gyro - Phase shift in light travelling opposite ways around a coil
Rate integrating gyro - Output proportional to angle turned through
Flux valve - Sensing rotation rate by precession
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
The first three describe their devices correctly: the ring laser gyro senses the frequency difference between counter-rotating beams, the fibre optic gyro the phase shift around a coil, and a rate integrating gyro gives an output proportional to the angle turned through.
The fourth is wrong. A flux valve senses the earth's magnetic field to provide a north reference for a gyro-stabilised compass system - a magnetic device with no rotation sensing and no precession involved.
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