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驻波管中隔声量的四传感器测量法
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2009-06-29
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本文研究了驻波管中隔声量测试的一种新方法———四传感器测试法。它可以有效地消除透声部分末端反射波,尤其能提高低频段隔声量的测试精度。本文推导了四传感器法的隔声量计算公式,并进行了实验验证和分析。结果表明:采用四传感器法可更加精确地测定小样品垂直入射时的隔声量。
关键词:驻波管;隔声量;吸声末端;四传感器法
Abstract :A new method , four2microphone method that is used to measure sound t ransmission loss in the standing wave tube , has been studied in this paper. The method separated the t ransmission wave f rom the reflected wave in the absorbent ending. We conducted the formula and made an experi2 ment on the wave tube. The result s turn out :that the new method can raise the precision of the mea2 surement , especially in the low f requency range.
Key words : standing wave tube ; sound t ransmission loss ; absorbent ending ; four2microphone method
关键词:驻波管;隔声量;吸声末端;四传感器法
Abstract :A new method , four2microphone method that is used to measure sound t ransmission loss in the standing wave tube , has been studied in this paper. The method separated the t ransmission wave f rom the reflected wave in the absorbent ending. We conducted the formula and made an experi2 ment on the wave tube. The result s turn out :that the new method can raise the precision of the mea2 surement , especially in the low f requency range.
Key words : standing wave tube ; sound t ransmission loss ; absorbent ending ; four2microphone method
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