Fabry-Perot tomographs have captured compelling photoacoustic images as they combine small element sizes with high acoustic sensitivity and a broad frequency response. A photoacoustic tomograph based on a sCMOS camera and a Fabry-Perot sensor with uniform optical thickness was developed. The influence of camera parameters on the e.g., spatial distribution of the acoustic sensitivity was evaluated. The imaging capabilities were demonstrated by capturing images of PA phantoms.
Fabry-Perot (FP) sensors are typically read out using a raster scan to acquire tomographic Photoacoustic (PA) images. To speed up the recording time, wide-field illumination of the sensor in combination with a camera as detector can be used. In this study, an sCMOS camera and wavelengths around 517 nm are used to interrogate a FP sensor with a homogeneous optical thickness over a 4 cm2 aperture. The recorded time series show PA signals are acquired over the entire area of the interrogation beam. The performance of the system, such as the noise equivalent pressure, is evaluated.
Fabry-Perot tomographs have captured some of the most compelling photoacoustic images as they combine small element sizes with high acoustic sensitivity and a broad frequency response. A major fabrication challenge is the homogenization across large sensor areas. In this study, a spin coated photopolymer is used as spacer material. Its thickness can be modified spatially using UV light source leading to homogenization over areas of 2 x 2 cm2. The optical transfer function, acoustic sensitivity, and frequency response were measured using a camera-based tomograph. The imaging capabilities were demonstrated by capturing acoustic fields emitted by a transducer and PA phantoms.
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