TY - CHAP A1 - Gilani, Taravat Saeb A1 - Villringer, Claus A1 - Zhang, Edward A1 - Gundlach, H. A1 - Buchmann, Jens A1 - Schrader, Sigurd A1 - Laufer, Jan T1 - Parallelised photoacoustic signal acquisition using a Fabry-Perot sensor and a camera-based interrogation scheme N2 - Tomographic photoacoustic (PA) images acquired using a Fabry-Perot (FP) based scanner offer high resolution and image fidelity but can result in long acquisition times due to the need for raster scanning. To reduce the acquisition times, a parallelised camera-based PA signal detection scheme is developed. The scheme is based on using a sCMOScamera and FPI sensors with high homogeneity of optical thickness. PA signals were acquired using the camera-based setup and the signal to noise ratio (SNR) was measured. A comparison of the SNR of PA signal detected using 1) a photodiode in a conventional raster scanning detection scheme and 2) a sCMOS camera in parallelised detection scheme is made. The results show that the parallelised interrogation scheme has the potential to provide high speed PA imaging. KW - photoacoustic imaging KW - parallelised signal acquisition KW - Fabry-Perot polymer film sensor Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-15335 SP - 217 EP - 222 PB - SPIE ER - TY - CHAP A1 - Sievers, Jan A1 - Villringer, Claus A1 - Lebek, Werner A1 - Gilani, Taravat Saeb A1 - Laufer, Jan T1 - Photoacoustic tomography using a Fabry-Perot sensor with homogeneous optical thickness and wide-field camera-based detection T2 - Opto-Acoustic Methods and Applications in Biophotonics VI N2 - 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. KW - photoacoustic tomograph KW - Fabry-Perot sensor KW - camera-based setup KW - photopolymer KW - polyvinyl cinnamate KW - interferometer transfer function KW - acoustic sensitivity KW - detection aperture Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-17850 ER - TY - CHAP A1 - Villringer, Claus A1 - Gilani, Taravat Saeb A1 - Zhang, Edward A1 - Pulwer, Silvio A1 - Steglich, Patrick A1 - Schrader, Sigurd A1 - Laufer, Jan T1 - Development of tuneable Fabry-Pérot sensors for parallelised photoacoustic signal acquisition T2 - Proc. SPIE 10878, Photons Plus Ultrasound: Imaging and Sensing 2019, 108780M (8 March 2019) N2 - Fabry-Pérot (FP) sensors have enabled high resolution 3D photoacoustic (PA) imaging in backward mode. However, raster-scanning of the interrogation laser beam across the sensor can result in slow 3D image acquisition. To overcome this limitation, parallelized PA signal acquisition can be used for which FP sensors with uniform optical thickness are required. In this work, the optical thickness is tuned a) irreversibly through the use of a photopolymer host matrix and b) actively using embedded electro-optic (EO) chromophores. Polymer spacers (5 μm) were deposited using spin coating and sandwiched between two dielectric mirrors and transparent ITO electrodes. The employed polymer guest-host system consists of an EO chromophore (2-methyl-4-nitroaniline) and poly(vinyl cinnamate). EO tuneability was induced using contact poling and a tuneability of 68 pm was demonstrated. The optical thickness was homogenised by raster scanning a UV beam whilst varying the exposure time across a 4 mm2 detection aperture. Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-13769 SN - 1996-756X PB - Society of Photo-Optical Instrumentation Engineers (SPIE) ER -