摘要
准确的声波飞渡时间在声学测温中具有非常重要的意义,但是不同容量、不同负荷、不同时刻下运行的锅炉都可能使得背景噪声发生变化。现场炉膛背景噪声的不断变化引起了信噪比的不断变化。指出了声学测温中几种传统的时延估计方法的不足,通过改进的四阶累积量算法,实现了低信噪比、信噪比变化环境下的准确声波飞渡时间的测量。
The accurate transmitted time of sound wave in acoustic pyrometry has the vital significance.But it possibly enables the background noise to change when the boiler under the different capacity,the different load,and the different time.The scene chamber background noise unceasing change has caused the SNR unceasing change.The disadvantages of some traditional methods of TDE are shown.By using the improved fourth order cumulants,accurate sound wave transit time survey is realized under the low SNR and the SNR change environment.
出处
《计算机工程与应用》
CSCD
北大核心
2010年第8期234-237,共4页
Computer Engineering and Applications
关键词
声学测温
时间延迟估计
互相关
改进的四阶累积量算法
acoustic pyrometry
time delay estimation
cross-correlation
improved fourth order cumulants
