A typical characteristic of acoustic emission parameters generally include: arrival time, amplitude, energy, ringing count rises under count, duration, rise time Pictured burst-type acoustic emission standard definition signal simplified waveform parameters. This model can be obtained from the following parameters: (1) wave hit (event) count; (2) the ring count; (3) energy; (4) the magnitude; (5) the duration; (6) the rise time; acoustic emission simplified schematic definition signal waveform parameters for continuous acoustic emission signals, the above model, only the ringing count and energy parameters can be applied. In order to more accurately describe the characteristics of continuous acoustic emission signals, which also introduced the following two parameters: (7) the average signal level; (8) RMS voltage. The magnitude of the acoustic emission signal usually dBae said 1 V when the sensor output is defined as 0dB, the magnitude of the amplitude of dBae Vae acoustic emission signals is calculated by the following formula:? (? Vae / 1 V) dBae = 20 lg following table a list of commonly used parameters of acoustic emission signal meaning and purpose. These cumulative parameters may be defined as the time or test parameters (such as pressure, temperature, etc.) of a function, such as the total event count, the total count and total energy ringing counting. These parameters can also be defined as the time or change function test parameters, such as acoustic emission event count rate, ringing acoustic emission count rate of acoustic emission signal energy rate. Between any two of these parameters can also be a combination of correlation analysis, such as acoustic emission event - amplitude distribution, energy AE events - duration of the associated maps. Acoustic emission signal parameters of the meaning and use of the characteristics and uses of the impact parameter meaning (Hit) and hit count exceeds a certain threshold and to obtain any signal of the data channel is called a strike. The number of impact measured, can be divided into the total count, count rate reflects the total amount of acoustic emission activity and frequency, commonly used in the evaluation of acoustic emission activity event count produced a material change locally called an acoustic emission acoustic emission events. Can be divided into the total count, the count rate. An array, corresponding to one or more of the impact event reflects an acoustic emission amount and frequency of events, activities and orientation concentration evaluation count the number of oscillations for the source crosses the threshold signal, can be divided into the total count rate and count The signal processing is simple, suitable for two types of signals, but also roughly reflect the signal strength and frequency, which is widely used in acoustic emission activity assessment, but the maximum amplitude of the signal waveform amplitude values ??affected the size threshold, usually expressed by dBae ( sensor output 1? V is 0dB) and is directly related to the size of the event, is not affected by the threshold, directly determine the event testability, commonly used to identify the type of wave source of strength and energy attenuation measurement count (MARSE) signal detection package area under the envelope can be divided into the total count and the count rate to reflect events or relative energy intensity. On the threshold, the operating frequency and propagation characteristics less sensitive, you can replace the ring count, but also the duration of the signal is used to identify the type of wave source for the first time crossed the threshold to the final drop experienced threshold intervals to? S representation and vibration bell count very similar, but the type commonly used in the particular wave source and the rise time of the signal noise of the first discriminating crossed the threshold to the maximum amplitude of the elapsed time interval to? s indicates the impact due to its propagation becomes clear physical meaning, sometimes used to identify the mechanical and electrical noise within the RMS voltage (RMS) sampling time, the rms value of the signal to V represents the size and acoustic emission is related to the measurement is simple, unaffected by the threshold for continuous signals, mainly used Evaluation of launch activities within the average signal level (ASL) in continuous sound sampling time, the average signal level in dB RMS provides information and use and is similar to the magnitude of the dynamic range requirements of high time resolution and less demanding The continuous signal, particularly useful. Also used to measure the background noise level of the arrival time of an acoustic emission sensor wave arrival time to? S determines the wave source represents the position, spacing and transmission speed sensor, for calculating the position of the wave source outside the process of addition of the variable test variables, including time load, displacement, temperature and fatigue week does not belong to an inferior signal parameters, but the parameters are the wave hit signal data sets for analysis of acoustic emission activity