A differential fiber optic gyroscope (FOG) driven by two broadband light sources with different wavelengths was demonstrated theoretically and experimentally, and bias drift and angle random walk both can be reduced considerably due to common-mode error cancellation. A 3-component fiber optic rotational seismometer based on the differential FOG was developed and successfully applied in rotational seismic observation.
A new system of observing and measuring magnetic domain is designed in this paper. The system includes three parts - the principal part of observing and measuring the magnetic domain, the crate controller and the computer used to control
the whole system. The principal part consists of x-y scanner, z scanner, digital source meter, ion blower, optical
microscope, and giant magnetic resistor (GMR) magnetic head. The GMR magnetic head in this system can be intact
after a long-time running in the ordinary laboratory by taking some measures of eliminating electrostatic discharge
(ESD). We successfully observed the magnetic domain written in a nanomagnetic material and measured the size of the
magnetic domain by use of the new system. The system is very simple and inexpensive, and it has high resolution and
signal-to-noise.
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