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Development of prototype of electronic speckle interferometry based spirometer

机译：基于螺旋计的电子斑点干涉测定仪的原型的开发

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摘要

The paper reports the design, construction, and calibration of the prototype of a spirometer based on electronic speckle interferometry (ESPI). The conventional ESPI setup is modified by incorporating a DNM (DiaphragmNozzle-Mouthpiece) module comprising a metallic diaphragm, regulated airflow channel, and a mouthpiece. The exhaled air after a deep breathe is channelled to the DNM module where the diaphragm gets deformed. From the circular fringe pattern obtained by subtracting the speckled images before and after deformation of the metallic diaphragm, the radius of curvature (R) due to deformation is calculated using the principle of Newton's rings. The value of R and peak expiratory flow rate (PEFR) from the standard spirometer reading are correlated. From the 640 observations spread over the range 100 - 500 L/min in the standard spirometer, an empirical relation is set in terms of R from the scatter plot. The ESPI spirometer (ESPIS) is validated by determining the value of R corresponding to a particular PEFR from the empirical relation and also from the standard spirometer. The PEFR calculated from ESPIS matches well with the standard spirometer reading, which suggests that the system designed and constructed can be used for biomedical applications for assessing lungs' efficiency.
机译：本文报告了一种基于电子散斑干涉测量法（ESPI）的肺活量计原型的设计，结构和校准。通过结合包括金属膜片，调节气流通道和吹嘴的DNM（隔膜喷嘴 - 吹嘴）模块来修改传统的ESPI设置。深呼吸后的呼出空气被引导到隔膜变形的DNM模块。根据通过在金属隔膜变形之前和之后减去斑点图像而获得的圆形条纹图案，使用牛顿环的原理计算由于变形引起的曲率半径（R）。 R和峰值呼气流量（PEFR）的值与标准肺血管读数相关。从标准肺素中的640次观察范围铺展到100 - 500 L / min的范围内，从散点图的R设置了经验关系。通过确定与经验关系的特定PEFR对应的r的值和标准肺血换器来验证ESPI肺仪（ESPIS）。由ESPIS计算的PEFR与标准肺血管读数良好，这表明设计和构造的系统可用于评估肺部效率的生物医学应用。

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