Plasma parameter diagnosis method based on BP neural network
A BP neural network and plasma technology, applied in the field of electromagnetism, can solve problems such as inability to fit curves
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[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] see figure 1 , the present invention is a method for estimating and diagnosing plasma sheath electron density based on BP neural network, based on the principle that:
[0038] Firstly, the reflection coefficient amplitude and phase corresponding to different electron density distributions in the plasma are obtained by the HMM method, and according to the interval of the sampling frequency of 0.1GHZ, that is, the reflection coefficient amplitude and phase of 40 frequency points are a group of samples, which are respectively used as neurons. The characteristics of the network x1, x2; the plasma model with a sheath thickness of 15cm is divided into 100 layers, and the electron density distribution value corresponding to each layer is used as the label y. Based on the BP neural network gradient descent method, through the use of Adam opti...
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