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The rudimental airborne molecular contaminants (AMCs) will obviously reduce the lifetime of the lens widely used in the high peak power laser system. An inline AMCs sensor based on the optical microfiber (OM) is here proposed. When the AMCs adhere on the profile of sensing OM, the covering film would disturb the evanescent field transmitted out of the OM, and an additional loss would occur due to the absorptive attribution of the AMCs. The relationship between the thickness of the covering film and the additional loss is numerically calculated.

Digital open-loop fiber-optic gyroscope detection scheme based on sinusoidal phase modulation is introduced. A novel implementation of the detection scheme is developed with digital signal processor (DSP) and field programmable gate array (FPGA). The design and implementation of the detection system are discussed. Timing control and open-loop signal preprocessing are realized in FPGA. Rotation rate calculation is finished in DSP. Experiments result shows that good performances have been achieved and the implementation scheme is of great practical value.