Design, construction, and evaluation of a BioAcoustic transducer testing (BATT) system for respiratory sounds
Design, construction, and evaluation of a BioAcoustic transducer testing (BATT) system for respiratory sounds
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DOI：
10.1109/tbme.2006.873696
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发表时间：
2006-08-01
影响因子：
4.6
通讯作者：
Wodicka, George R.
中科院分区：
文献类型：
--
作者：
Kraman, Steve S.;Pressler, Gary A.;Wodicka, George R.
许多不同的传感器用于记录呼吸声音，包括耦合器中的加速度计和麦克风。然而，没有标准的肺声换能器或任何设备来比较换能器，因此可以确定来自不同实验室的测量结果是生理来源，而不是换能器的技术工件。为了解决这个问题，我们设计并构建了一个设备的原型，可以用来比较加速度计、封装在耦合器中的麦克风和听诊器。该原型装置由一个刚性腔室组成，其中包含一个扬声器，该扬声器通向一个由粘弹性材料覆盖的前厅，该材料具有类似于人体皮肤和皮下组织的机械特性。当由白噪声源驱动时，我们发现表面的声音输出对于比较评估100和1200 Hz之间的传感器是有用的，因为肺部声音具有大部分的频谱能量。我们将粘弹性层与相似厚度的鲜肉和脂肪进行比较，发现它们产生相似的声谱。该装置允许空气耦合传感器，加速度计和听诊器用于呼吸声音测量在物理条件下进行比较，类似于它们的预期用途。
Many different transducers are employed for recording respiratory sounds including accelerometers and microphones in couplers. However, there is no standard lung sound transducer or any device to compare transducers so that measurements from different laboratories can be determined to be of physiologic origin rather than technical artifacts of the transducers. To address this problem, we designed and constructed a prototype of a device that can be used to compare accelerometers, microphones enclosed in couplers, and stethoscopes. The prototype device consists of a rigid chamber containing a loudspeaker that opens to an antechamber covered by a viscoelastic material with mechanical properties similar to human skin and subcutaneous tissue. When driven by a white noise source, we found the sound output at the surface to be useful to comparatively evaluate sensors between 100 and 1200 Hz where lung sounds have most of their spectral energy. We compared the viscoelastic layer to similar thicknesses of fresh meat and fat and found them to produce similar acoustic spectra. This device allows air-coupled transducers, accelerometers, and stethoscopes used in respiratory sounds measurements to be compared under physical conditions similar to their intended use.