Wilfried Uhring

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We demonstrate time-correlated single photon counting (TCSPC) in microfluidic droplets under high-throughput conditions. We discuss the fundamental limitations in the photon acquisition rate imposed by the single photon detection technique and show that it does not preclude accurate fluorescence lifetime (FLT) measurements at a droplet throughput exceeding(More)
In this paper, two architectures for high-speed time-resolved imaging circuits in (Bi)CMOS technology are presented. The first architecture adopts the traditional for the most silicon imagers matrix configuration, where the photocharges-induced signal is processed directly in-pixel. The second approach is based on a single light detecting vector, comparable(More)
Continuous wave Near InfraRed Spectroscopy (NIRS) has been used successfully in clinical environments for several years to detect cerebral activation thanks to oxymetry (i.e. absorption of photons by oxyand deoxyhemoglobin) measurement. The goal of our group is to build a clinically-adapted time-resolved NIRS setup i.e. a setup that is compact and robust(More)
www.ecsi.org/dasip Nowadays, 3D vision is a common tool that is now available in the consumer electronics and many current and future applications require high speed estimation of the object depths of acquired image scenes. High speed acquisition and image processing are challenging tasks that are the heart of this session. According to the process and(More)
This work aims to introduce a design methodology of Time-to-Digital Converters (TDCs) on low cost Field-Programmable Gate Array (FPGA) targets. First, the paper illustrates how to take advantage of the presence of carry chains in elementary logic elements of the FPGA in order to enhance the TDC resolution. Then, it describes how to use the Chip Planner tool(More)
This paper presents the state of the art of the Integrated Streak Camera (ISC) architectures in standard CMOS technology. It focuses on some of the methods required for reconstructing the luminous events profile from the chip raw data. Two main ISC architectures are presented. The first adopts the traditional for the most silicon imagers pixel array(More)
Streak cameras are now reaching sub-picosecond temporal resolution. In cumulative acquisition mode, this resolution does not entirely rely on the electronic or the vacuum tube performances but also on the light source characteristics. The light source, usually an actively mode-locked laser, is affected by phase and amplitude noises. In this paper, the(More)