Measurement of indoor climate using acoustic travel-time tomography

使用声学走时断层扫描测量室内气候

• 批准号: 465591632
• 负责人: Professor Dr.-Ing. Ercan Altinsoy
• 金额: --
• 依托单位: Lehrstuhl Bauphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/465591632?language=en
• 关键词: Measurement; indoor; climate; using; acoustic

The two main criteria determining thermal comfort of occupants are the air temperature and the airflow velocity. To monitor these parameters, in-situ sensors are usually mounted in the indoor environment. One of the drawbacks of this conventional method is the measurement at a certain location instead of the distribution of target parameters in the whole room including the occupant zone. Moreover, mounting multiple sensors directly in the measurement environment (e.g., airflow sensors) is problematic due to their interference effect on the measured parameters itself. Acoustic travel-time tomography (ATOM) technique as a remote sensing method is a solution to overcome the mentioned shortcoming of traditional sensors. ATOM utilizes the dependency of the sound velocity on the air temperature and flow velocity in the medium. The average sound velocity, along propagation paths, is determined by travel-time estimation of a defined acoustic signal between transducers. This detected sound velocity can be converted into spatially distributed air temperature and airflow velocity by using a proper tomographic algorithm. The primary goal of the project is to develop a measurement system for calculating both room air temperature and airflow velocity distribution based on the ATOM method. Over the course of studies conducted in the climate chamber of the BUW, a three-dimensional representation of the air temperature distribution was successfully measured by placing a transmitter and a receiver at optimal positions. The extension of the method to include the airflow velocity measurement in parallel to the air temperature is one of the tasks of this project. Furthermore, the measuring system will be developed for an occupied room condition considering an actual workplace. With the aim of resolution enhancement, several tasks are defined in terms of numerical methods and practical measurements. To draw conclusions about the measurement accuracy, required comparative measurements will be conducted under different climatic conditions.

决定人体热舒适性的两个主要标准是空气温度和气流速度。为了监测这些参数，通常在室内环境中安装原位传感器。该传统方法的缺点之一是在特定位置处的测量，而不是在包括居住者区域的整个房间中的目标参数的分布。此外，将多个传感器直接安装在测量环境中（例如，气流传感器）由于其对测量参数本身的干扰效应而存在问题。声走时层析成像技术作为一种遥感方法，是克服传统传感器上述缺点的一种解决方案。ATOM利用声速对介质中空气温度和流速的依赖性。沿着传播路径的平均声速由换能器之间的定义的声学信号的行进时间估计来确定。通过使用适当的层析算法，可以将该检测到的声速转换成空间分布的空气温度和气流速度。该项目的主要目标是开发一种基于ATOM方法的测量系统，用于计算室内空气温度和气流速度分布。在BUW气候室进行的研究过程中，通过将发射器和接收器放置在最佳位置，成功测量了空气温度分布的三维表示。将该方法扩展到包括与空气温度并行的气流速度测量是本项目的任务之一。此外，将考虑实际工作场所，针对占用房间条件开发测量系统。以提高分辨率为目的，在数值方法和实际测量方面定义了几项任务。为了得出关于测量精度的结论，将在不同的气候条件下进行所需的比较测量。