Monitoring of Thermal Environment in Space Using Acoustic Probe

声音的传播速度经常被用来测量温度。声音探测器具有非接触传感和快速反应的优势。通过将声音探测器与计算机断层（CT）和数据干扰结合在一起，可以通过空间重建的温度分布图像。我们提出了一种方法来测量平均温度和在两个维度空间中使用声学CT （A-CT）方法来使用一种非常小的声学传感器来测量温度分布。这个监测系统可以很容易地设置，也可以随时监测大气层。这个系统具有优势，因为它可以在这样的应用中使用，如室内环境评估、空气条件和能源保护。作为两年后基础研究的结果，下一个事实得到了证实。The thermometry using the sound probe confirmed being suitable for environmental monitoring of large-scale space of several thousand mie D12 mie D1， life space of several mie D12 mie D1 ... More and enclosed space of several cmイイD12イエD1。这项研究还可以为防止二恶英等环境问题做出贡献。已完成的研究结果的大纲如下。（1） Temperature Measurement Using Sound Probe and its Measurement Error（D11，2）D1A burst of sound created by the computer is connected to a transmitter via the digital-to-analog（D-A） converter， and the received signal is applied to the computer via the analog-to-digital（A-D） converter。声音飞行的时间是从创建的爆炸信号数据和测量信号之间的相关性中测量出来的。时间分辨率实际上是4微秒，因为采样频率实际上是250千赫。使用一条简短的基线，即平均温度的测量可能达到0.5 ° C或更低的准确度。（2） Measurement of Temperature Distribution in Rectangular Space（矩形空间）D1The measured object is a rectangular space of size 4，020 mm （D） × 4，200 mm （W） partitioned into a 3 × 3 grid， with 9 unit cells。通过对声音传播路径的特定几何属性进行排序，我们可以将温度分布的表达式格式化为声音速度的矩阵函数。十二个传感器安装在与四个墙壁接触的地方。我们用一个电热源创造了一个温度梯度的房间。实验性重建结果的房间温度分布在协议中，与估计的温度分布图的温度分布图一致。（3） Measurement of Temperature Distribution in Circular Space（Circular Space）D1The measured object is a circular space with a radius of 1，480 mm。16个变压器安装在圆形舞台上。如果没有机械运动，重建的投影数据就会被电子扫描获得。我们从一小部分数据集的干扰中重建了温度分布。电热器在空间中创造温度梯度。该温度配置文件由19个热耦合器测量，并用于计算机模拟。实验性地重新构建的图像与模拟图像达成一致。（4） Space Thermometry Using Delay Line Oscillator D15）Space Thermometry in space using a double-delay line oscillator is described。延迟线振荡器是传感器系统中重要的组件之一。在这项研究中，一种不连续的振荡的反向效应被采用声学技术来解决，它使用了多种振荡器。An experimental result at 40 kHz shows that the error of measured room temperature is 1.5%， in a room of size 4，020 mm （D） × 4，200 mm （W） × 3，550 （H）， with air conditioning。在本研究中提出的声学温度计在传统方法上具有优势，对于这样的应用程序作为大气监测和空气条件。Less（低）

The propagation velocity of sound is often used to measure temperature. The sound probe has the advantage of non-contact sensing and quick response. By combining a sound probe with computerized tomography (CT) and data interpolation, an image of temperature distribution through space can be reconstructed. We have proposed methods for measuring the mean temperature and the temperature distribution in two-dimensional space using an acoustic CT (A-CT) method with a very small number of acoustic transducers. This monitoring system can be set up easily and can monitor the atmosphere any time. This system has the advantage that it can be used in such applications as indoor environment evaluation, air conditioning, and energy conservation.As a result of the foundational research over two years, next facts were proven. The thermometry using the sound probe confirmed being suitable for environmental monitoring of large-scale space of several thousand mィイD12ィエD1, life space of several mィイD12ィエD1 … More and enclosed space of several cmィイD12ィエD1. This study can also contribute to environmental problem such as the dioxin prevention. Outlines of achieved research result are as follows.(1) Temperature Measurement Using Sound Probe and its Measurement Error ィイD11,2)ィエD1A burst of sound created by the computer is connected to a transmitter via the digital-to-analog (D-A) converter, and the received signal is applied to the computer via the analog-to-digital (A-D) converter. The time of flight of the sound is measured from the correlation in time between the created burst signal data and the measured signal. The time resolution is exactly 4 μs because the sampling frequency was exactly 250 kHz. Using a short base line, the measurement of mean temperature was possible at the accuracy of 0.5゜C or less.(2) Measurement of Temperature Distribution in Rectangular Space ィイD13)ィエD1The measured object is a rectangular space of size 4,020 mm (D) × 4,200 mm (W) partitioned into a 3 × 3 grid, with 9 unit cells. By arranging a certain geometrical property of the sound propagation path, we can formulate an expression for the temperature distribution as a matrix function of the sound velocity. Twelve transducers are installed in contact with the four walls. We create a temperature gradient throughout the room using an electrical heat source. Experimental reconstruction results of the room temperature distribution were in agreement with the distributions estimated from the temperature profiles of the heat sources.(3) Measurement of Temperature Distribution in Circular Space ィイD14)ィエD1The measured object is a circular space with a radius of 1,480mm. Sixteen transducers are installed on the circular stage. Without a mechanical motion, projection data for the reconstruction is acquired by electronic scanning. We reconstruct the temperature distribution by interpolation from a small number of data set. Electrical heaters create a temperature gradient in space. The temperature profile is measured by 19 thermocouples and used for a computer simulation. Experimentally reconstructed images are in agreement with the simulated images.(4) Space Thermometry Using Delay Line Oscillator ィイD15)ィエD1Acoustic thermometry in space using a double-delay line oscillator is described. The delay line oscillator is one of the important components in the sensor systems. In this study, an adverse effect of a discontinuous oscillation was solved with the adoption of the acoustic technique, which uses multiple oscillators. An experimental result at 40 kHz shows that the error of measured room temperature is 1.5%, in a room of size 4,020 mm (D) × 4,200 mm (W) × 3,550 (H), with air conditioning. The acoustic thermometry proposed in this study has advantages over conventional methods, for such applications as atmospheric monitoring and air conditioning. Less