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We analyze photoacoustic signals from capillaries and theoretically demonstrate the quantitative relationship between vascular diameter and spectral slope in a low-frequency band. Phantom experiments validate the theoretical analysis. Based on this finding, a spectrum-based photoacoustic microscopy is proposed.
Photoacoustic tomography (PAT) of biological tissue offers potential advantages in distinguishing different structures according to their chemical composition. Yet the detected photoacoustic signals are usually of low signal-to-noise ratio (SNR), which seriously deteriorates the image quality in PAT. This paper introduces an improved multi-sample based adaptive approach to solve such a problem. With...
In this article, a three-axis Ultraviolet Optical Sensor (UVOS) is designed, which can solve the problem of attitude determination for large field observation in the near-earth orbit. By applying an irregular optical system, i.e. the reflecting arrays and combined optical system, a circular large field of view is divided into 8 sub-fields. UVOS will provide the three-axis attitude information and...
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