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Ultrasound technique has been widely applied in various areas such as diagnostic applications, structure health monitoring, etc. Most advanced applications require novel ultrasonic transmitters, where fiber optic technique has been proved to be a great candidate due to its compact dimension, high frequency, and highly harsh environment survivability. Therefore, extensive research has been conducted...
In this paper, a portable visible spectrometer using an Android smartphone is proposed, designed and experimentally tested. The entire optical system consists of a 10 μm slit, the collimator lens, a 300 lines/mm transmission grating, and the imaging lenses. The CMOS image sensor of the smartphone is utilized for optical imaging. Then a built-in app will calculate the spectrum. Minimum spectral resolution...
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