Fisheye lens design for solar-powered mobile ultrasound devices
- Authors
- Ryu, Seonho; Ryu, Jaemyung; Choi, Hojong
- Issue Date
- Feb-2022
- Publisher
- IOS Press
- Keywords
- Mobile ultrasound machines; fisheye lens; solar power
- Citation
- Technology and Health Care, v.30, no.S1, pp.S243 - S250
- Journal Title
- Technology and Health Care
- Volume
- 30
- Number
- S1
- Start Page
- S243
- End Page
- S250
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83919
- DOI
- 10.3233/THC-228023
- ISSN
- 0928-7329
- Abstract
- BACKGROUND: Compared to benchtop ultrasound machines, mobile ultrasound machines require portable batteries when acquiring information regarding human tissues during outdoor activities. OBJECTIVE: A novel fisheye lens type was designed to address the charging issue where it is difficult to constantly track the sun. This method does not require the use of a mechanical motor that constantly tracks the sun to charge the portable batteries. METHODS: To obtain an optical solar power system, the numerical aperture (NA) and field angle must be increased. Therefore, we use the fisheye lens with the largest field angle. RESULTS: The NA of the designed fisheye lens system reaches 0.75, allowing light collection of approximately +/- 48 degrees. Additionally, the efficiency ratio of the central and surrounding areas also satisfies more than 80% at a field angle of 85 degrees and more than 70% at field angles of 85 degrees to 90 degrees, respectively. CONCLUSIONS: We designed a novel fisheye lens for solar-powered mobile ultrasound machines used outdoors.
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