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Adaptive array sensor and electrical circuit therefore

Bourquin, Stéphane ; Seitz, Peter Csem Centre Suisse D'Electronique et de Microtechnique SA (Corporate Author) 22 October 2002

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  • Title:
    Adaptive array sensor and electrical circuit therefore
  • Author: Bourquin, Stéphane ; Seitz, Peter
  • Csem Centre Suisse D'Electronique et de Microtechnique SA (Corporate Author)
  • Description: The invention relates to an adaptive array sensor for a pixel-parallel detection of modulated signals with a high dynamic range, to an on-chip electrical circuit therefor, and to a method for adaptively detecting a modulated signal. The signals to be detected are, e.g., coherent or heterodyne analog intensity modulated optical signals. The invention is especially well adapted to the fields of optical measurement technique where it is required to detect the amplitude of a small light intensity modulation superimposed on a high slow-moving background. This is usually the case in interferometric methods, for example single or multiple wavelength interferometry, and especially optical low-coherence tomography (OLCT). The on-chip electrical circuit () for the detection of modulated signals (I), e.g., light, comprises sensor means (PS), e.g., a photosensor, and feedback means (FB) including a low-pass frequency filter. The circuit () further comprises a voltage-controlled current source (CS), the input of which is connected to the output of the feedback means (FB) and the output of which is connected in series with the photosensor (PS) in a common node. The common node is connected to the input of an amplifier (AMP). The output of the amplifier (AMP) may be connected to a rectifier (RF), followed by a low-pass filter (LPF). A plurality of such electrical detection circuits () with parallel outputs can form a one-dimensional or two-dimensional array sensor for the coherent or heterodyne analog detection of intensity modulated optical signals simultaneously for all pixels with a high dynamic range. The array sensor may be used, e.g., in single or multiple wavelength interferometry, and especially in optical low-coherence tomography.
  • Creation Date: 22 October 2002
  • Language: English
  • Source: U.S. Patent Grants (USPTO)

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