I'm a navigation engineer, so I often have to deal with gyroscopes and their measurements. Out of curiosity, I've decided to build one myself and will give it a try with a Fiber Optics Gyroscope (FOG), which is a Sagnac Interferometer that consists of a laser, optical fiber coil, a beam splitter and a detector.
The basic idea is that the beam from the laser is split into two parts that enter the coil from the opposite sides. They travel through the coil until they meet and interfere in the splitter and then reach the detector. Since the interference ranges from destructive (zero output) to constructive (double the amplitude of a half beam), a large dynamic range detector is needed. Also, being able to sample it at least 10Hz (preferably even more) is desired.
I've looked into sensors like:
which could be an easy option, since it does amplification and AD conversion internally. Just its max frequency is 10Hz, which is on the lower side of what I want. Also the sensor itself is very small, thus the alignment between the laser and the sensor could be problematic. Some laboratory sensors like this have much larger sensing diameters (5-7 mm), thus would like to find something bigger as well. The laser I am using has 635nm wavelength, thus silicon based sensors is not a problem.
So, I am seeking for an advice on what kind of sensor suits the most here for this type of application taking into account the high dynamic range, sensitivity and preferably linearity (although this will probably depend on the measurement circuit).
Thanks for help! (and sorry if smth is wrong - this is my first post :))