U. Minoni et al., OPTICAL INTERFEROMETER USING A HIGH-BIREFRINGENCE OPTICAL-FIBER, IEEE transactions on instrumentation and measurement, 42(2), 1993, pp. 231-233
The paper presents a prototype of a new displacement measuring system
based on an optical interferometer using a polarization-maintaining op
tical fiber. The proposed configuration makes it possible to separate
the laser head and the detectors from the actual interferometer (i.e.,
the measuring head). In this way, the interferometric head can be min
iaturized and used to gauge targets which are difficult to access. The
resolution provided by the electronic fringe counter is equal to lamb
da/8 (approximately 80 nm), and the overall accuracy is 1 mum over a m
easuring range of 20 mm.