In this work, a new type of optical fiber pressure sensor based on Frequency Modulated Continuous Wave (FMCW) laser interference technology was designed and produced. The sensor consists of a diaphragm-type Fabry-Perot (F-P) cavity structure, which is made of 316L stainless steel with excellent elastic properties. The deformation of the diaphragm occurs under the gas pressure, which causes the length of the F-P cavity to change. The FMCW laser interference technique was employed to demodulate the change of cavity length. The experimental results show that the linearity of pressure and cavity length can reach 0.99993 whin the range of 0~600 kPa, and also verify that the pressure sensor has good repeatability and stability.
KEYWORDS: Signal detection, Signal to noise ratio, Interference (communication), Sensors, Signal processing, Optical sensors, Statistical analysis, Data modeling, Analytical research
The detection performance of light screen array (LSA) is predominantly affected by sky background noise, and this probably leads to decrease of its effective detection height. This research addresses a method based on constant false alarm rate (CFAR) to solve this problem effectively. The characteristics of the dynamic signal of the LSA are reasonably analyzed, and a Bayesian classification model is scientifically formulated. We construct an adaptive threshold detector using CFAR, thereby extracting the dynamic signal, effectively, under the poor signal to noise ratio (-1 to 5dB). Through semi-physical simulation and live ammunition test, the assessments demonstrate the proposed method can increase the effective detection height of a flying projectile by 20% at least, and its performance is better than previous those.
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