Abstract
In the process of oil field development, acoustic telemetry system is an important means to realize the wireless communication between underground and ground. However, due to the attenuation of acoustic waves in the transmission process, the signal becomes very weak when it reaches the ground, so, weak signal detection is very important for acoustic telemetry system. This paper proposed a weak signal detection with chaotic oscillator based on virtual instrument technology. Firstly, analyzed the principle of the weak sinusoidal signal detection with Duffing chaotic oscillator. Especially the influence of the signal initial phase was discussed; and then the multi-phase- capture method based on virtual instrument technology was proposed, it was achieved by programming with LabVIEW. The results indicate that the method not only could effectively detect the weak inputted signal with random phase, but also it features progressiveness and practicability used for downhole acoustic telemetry system.
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