Air Temperature Distribution Measurement Using Asynchronous-Type Sound Probe

Air Temperature Distribution Measurement Using Asynchronous-Type Sound Probe
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使用异步型声探头测量空气温度分布

DOI:
10.1143/jjap.48.07gb03
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发表时间:
2009
影响因子:
1.5
通讯作者:
K. Mizutani
K. Mizutani
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Yosuke Katano;N. Wakatsuki;K. Mizutani

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在使用声探头的常规温度测量中,两个声传感器的操作开始必须完全同步以测量飞行时间(TOF)tf,因为同步的精度决定TOF测量精度。无线局域网(LAN)便于构建传感网格,但它会导致毫秒级的延迟波动。因此,它不能为同步声学传感器提供足够的精度。在以前的研究中,同步是通过使用同轴电缆的触发线实现的;然而,电缆降低了无线传感网格的灵活性,特别是在大规模测量中。在本研究中,我们设计了一个双通道型的声探头,以补偿网路造成的毫秒级延迟的影响。对探头的有效性进行了检验,并利用该方法测量了空气温度分布。采用矩阵法求出分布。使用声学型声探头和热电偶观察到类似的结果。这表明即使省略触发线,使用带有异步型声音探头的传感网格进行温度分布测量的有效性。
In conventional temperature measurement using a sound probe, the operation beginnings of two acoustic sensors must be completely synchronized to measure time of flight (TOF), tf, because the precision of synchronization determines TOF measurement accuracy. A wireless local area network (LAN) is convenient for constructing a sensing grid; however, it causes a fluctuation in the delay of millisecond order. Therefore, it cannot provide sufficient precision for synchronizing acoustic sensors. In previous studies, synchronization was achieved by a trigger line using a coaxial cable; however, the cable reduces the flexibility of a wireless sensing grid especially in larger-scale measurement. In this study, an asynchronous-type sound probe is devised to compensate for the effect of the delay of millisecond order caused by the network. The validity of the probe was examined, and the air temperature distribution was measured using this means. A matrix method is employed to obtain the distribution. Similar results were observed using both asynchronous-type sound probes and thermocouples. This shows the validity of the use of a sensing grid with an asynchronous-type sound probe for temperature distribution measurement even if the trigger line is omitted.
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