The new shooting technique can shed light on the COVID-19 transmission

The researcher has developed a new recording technique exhale an individual while singing or talking to someone, potentially providing a better understanding of the effectiveness of face masks and transmission from various diseases, such as COVID-19.

A new recording technique was used to capture the exhaled breath of the speaker. This is a demonstration of a published recording technique that is being further explored. The recording shows only the temperature change associated with exhaled breath, which does not necessarily reflect the movement of viral particles contained in the breath. Image credit: Thomas Moore, Rollins College.

Scientists believe that the SARS-CoV-2 virus is primarily spread by respiratory droplets that can be carried in the breath or expelled by coughing or sneezing. But it is also transmitted by air aerosols, which are small particles that stay in the air longer than larger droplets.

Thomas Moore, Rollins College

He continued, “The system I developed provides a way to estimate how much breath travels before it disperses into the surrounding air and can provide visual evidence that masks significantly limit the distance the breath travels in air. ”

To show the temperature variations between ambient air and exhaled breath, Moore applied a variation of the electronic interferometry of the pattern samples. The study was published in the journal Optical Society (OSA), Applied optics.

In addition, a new method can be used to analyze the details of the flow of breath from the mouth as individuals sing or speak. Such an approach may prove useful for speech therapy and music teaching.

From musical instruments to people

Moore initially designed recording technology to investigate airflow through musical instruments, such as the organ.

In response to the COVID-19 pandemic, I began painting the breath of people talking and singing. I realized that by increasing my existing system I could probably determine how much my breath stretches and how effective masks can be in limiting my breath range.

Thomas Moore, Rollins College

Most of the existing techniques used to capture exhaled air involve expensive equipment and can only capture a relatively small region. Therefore, to address such limitations, Moore has developed a new system that uses standard optical components available on the market.

I used a variation of electronic spectrometric interferometry, which has been used for many years to study the vibrational patterns of solid objects. The innovation was to change the system in such a way that it could be used to display transparent things, such as breath, instead of solid vibrating objects.

Thomas Moore, Rollins College

The new recording system uses the fact that the speed of light will vary depending on the temperature of the air through which it flows. Because the breath is warmer than the surrounding atmosphere, the light transmitted by the breath arrives at the camera just before the light that has not traveled through it. Scientists can use this small variation in the speed of light to create images of exhaled breath.

To test the new system, Moore painted the breath of a professional musician playing the flute – one of the few musical instruments in which the musician blows directly into the surrounding air – and several professional vocalists singing.

Working with the musicians immediately confirmed that the system worked well and could be used to study various problems“, Added Moore.

Air flow change

Currently, Moore uses a new technique to analyze the effectiveness of masks in reducing the distance traveled by exhaled aerosols. Moore is particularly focused on the study of singing because, according to studies, a larger amount of aerosol is exhaled while speaking loudly or loudly or singing while speaking in normal tones.

In addition, Moore is working to make the new system more stable against vibration and to further increase the size of the system to image larger regions.

According to Moore, the new method has already shown new data that can affect how people approach masking and removal requests, especially when outdoors. Moore hopes to submit these results for publication soon.

The pandemic has caused many musicians an economic disaster and all the information we can provide them that will help them get back to work is important. We had a lot of interest from the music community, and I expect the health community to be interested when we start publishing our results.“Moore concluded.

Journal reference:

Moore, TR (2020) Visualization of exhaled administration by electronic interferometry of a colorful sample. Applied optics.