远场涡流检测中的数字相敏检波器的研究 关键词： 远场涡流；微弱信号检测；数字相敏检波 [gap=488]Key words: remote field eddy current;weak signal detect;digital phase signal detecting
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The theory of weak signal detect is the key technology in signal detect field, which is an integrated technology based on electronics, information theory, physics and computer science.
研究噪声中微弱信号检测的原理和方法，是测量技术中的综合技术和尖端领域。
Bilinear time-frequency transform possesses a high resolution both in the time domain and the frequency domain. It can be utilized to detect weak transient signal in complex background.
双线性时间-频率变换在时间域与频率域都具有较高的分辨率，有利于复杂背景条件下微弱瞬时信号的探测。
The proposed method excellently solves the technical problem that common instrument is difficult to detect weak signal.
这种方法很好地解决了通用仪器难于检测微弱信号的技术不足。
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