Design and application of visual mask fit test device based on schlieren technology
Leakage from improper mask wear can significantly reduce the effectiveness of a mask.Existing mask fit test results only tell whether there is gas leakage while wearing the mask,but not where the airflow is leaking,and they do not allow for real-time adjustment of the mask wearing style.A mask fit test device is designed using schlieren technology.The technique utilizes the perturbation of light waves by airflow to visualize airflow changes that are invisible to the naked eye by converting them into images that can be seen.The mask fit test device can be used to observe the leakage of airflow from masks under different masks and different wearers,and measure the striation area of the leaked airflow.The device was used to test the fit of masks when worn by a head model or a real person.The schlieren of the leaking airflow was most pronounced when the head model wore a medical surgical mask.The leakage airflow also varies among individuals wearing the same type of mask.The effectiveness of the device was verified using a medical surgical mask,and the results obtained from the test showed that the edge leakage rate was 36.83％when the mask was worn correctly.
schlieren technologyfit test devicevisualizationmask
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