Armin Hochreiner

Publications (8)9.58 Total impact

• Source

  Available from: Thomas Berer

  Article: A webcam in Bayer-mode as a light beam profiler for the near infra-red.

  Gregor Langer, Armin Hochreiner, Peter Burgholzer, Thomas Berer
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  ABSTRACT: Beam profiles are commonly measured with complementary metal oxide semiconductors (CMOS) or charge coupled devices (CCD). The devices are fast and reliable but expensive. By making use of the fact that the Bayer-filter in commercial webcams is transparent in the near infra-red (>800 nm) and their CCD chips are sensitive up to about 1100 nm, we demonstrate a cheap and simple way to measure laser beam profiles with a resolution down to around ±1 μm, which is close to the resolution of the knife-edge technique.
  Optics and Lasers in Engineering 05/2013; 51(5):571-575. · 1.84 Impact Factor
• Article: Photoacoustic imaging using an adaptive interferometer with a photorefractive crystal.

  Armin Hochreiner, Thomas Berer, Hubert Grün, Michael Leitner, Peter Burgholzer
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  ABSTRACT: In this paper we report on remote three-dimensional photoacoustic imaging without the need for a coupling agent or other aids (e.g. detector foils) by utilizing a two-wave mixing interferometer (TWMI). In this technique the beams coming from sample and reference are brought to interfere in a Bi₁₂SiO₂₀ photorefractive crystal (PRC). Such a setup allows the measurement of ultrasonic displacements on rough sample surfaces. After data acquisition the initial pressure distribution is reconstructed by a Fourier domain synthetic aperture focusing technique (FSAFT). We present three-dimensional imaging of a hair ribbon phantom, on biological samples with embedded artificial blood vessels or pig bristles, and measurements on a human forearm in-vivo.
  Journal of Biophotonics 02/2012; 5(7):508-17. · 4.34 Impact Factor
• Source

  Available from: Thomas Berer

  Article: Remote photoacoustic imaging on solid material using a two-wave mixing interferometer.

  Thomas Berer, Armin Hochreiner, Saeid Zamiri, Peter Burgholzer
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  ABSTRACT: We report on remote and contactless photoacoustic imaging (PAI) for the inspection of solid materials using a two-wave mixing interferometer. In this Letter, a semitransparent sample was excited with picosecond laser pulses. The local absorption of the electromagnetic radiation led to generation of broadband ultrasonic waves inside the sample. Ultrasonic waves arriving at the sample surface were detected utilizing a two-wave mixing interferometer. After data acquisition, the initial pressure distribution was reconstructed using a Fourier space synthetic aperture technique algorithm. We show the potential of PAI for the inspection of semitransparent solid materials.
  Optics Letters 12/2010; 35(24):4151-3. · 3.40 Impact Factor
• Conference Proceeding: Remote Contactless Photoacoustic Imaging

  Armin Hochreiner, Thomas Berer, Bernhard Reitinger, Hubert Grün, Peter Burgholzer
  Informationstagung Mikroelektronik 2010;
• Conference Proceeding: Remote Contactless Photoacoustic Imaging for Non Destructive Testing

  Armin Hochreiner, Thomas Berer, Peter Burgholzer
  Proceedings Industrielle Computertomographie, Fachtagung 2010;
• Conference Proceeding: Broadband Integrating Ultrasound Detectors for Photoacoustic Imaging

  Hubert Grün, Thomas Berer, Armin Hochreiner, Robert Nuster, Günther Paltauf, Peter Burgholzer
  Informationstagung Mikroelektronik 2008;
• Conference Proceeding: Photoacoustic Imaging With Integrating Line Detectors

  Hubert Grün, Thomas Berer, Armin Hochreiner, Robert Nuster, Günther Paltauf, Peter Burgholzer
  Medical Imaging: Ultrasonic Imaging and Signal Processing;
• Conference Proceeding: Contactless photoacoustic imaging of biological samples

  Thomas Berer, Armin Hochreiner, Hubert Grün, Peter Burgholzer
  Biomedical Optics: Photons Plus Ultrasound: Imaging and Sensing 2012;