Blar i SINTEF Open på forfatter "Tschudi, Jon"
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A DMD (Digital Micro-Mirror Device) Based Multi-Object Quasi-Imaging Spectrometer
Kirkhus, Trine; Fismen, Britta Grennberg; Skotheim, Øystein; Tschudi, Jon (Lecture, 2009)In order to increase flexibility in spectral measurements performed by a point detector spectrometer, we are using digital micro-mirror devices (DMD) to selectively both illuminate and pick out regions of interest from a ... -
Assessment of Intestinal Ischemia–Reperfusion Injury Using Diffuse Reflectance VIS-NIR Spectroscopy and Histology
Hou, Jie; Ness, Siri Schøne; Tschudi, Jon; O'Farrell, Marion; Veddegjerde, Rune; Martinsen, Ørjan Grøttem; Tønnessen, Tor Inge; Strand-Amundsen, Runar James (Peer reviewed; Journal article, 2022)A porcine model was used to investigate the feasibility of using VIS-NIR spectroscopy to differentiate between degrees of ischemia–reperfusion injury in the small intestine. Ten pigs were used in this study and four segments ... -
Calibration of a Multi-Object Spectrometer with Programmable and Arbitrary Field of View
Kirkhus, Trine; Fismen, Britta Grennberg; Tschudi, Jon; O'Farrell, Marion (Lecture, 2010)Employing digital micro-mirror devices to simultaneously select illumination and detection regions, increases flexibility in spectral measurements. We present a method for collecting regional reference spectra, for optimum ... -
High-quality dense 3D point clouds with active stereo and a miniaturizable interferometric pattern projector
Thorstensen, Jostein Bruun; Thielemann, Jens T; Risholm, Petter; Gjessing, Jo; Dahl-Hansen, Runar Plunnecke; Tschudi, Jon (Peer reviewed; Journal article, 2021)We have built and characterized a compact, simple and flexible 3D camera based on interferometric fringe projection and stereo reconstruction. The camera uses multi-frame active stereo as basis for 3D reconstruction, ... -
Impact of illumination spectrum and eye pigmentation on image quality from a fundus camera using transscleral illumination
Stepanov, Alexey; Thorstensen, Jostein Bruun; Tschudi, Jon (Peer reviewed; Journal article, 2021)Significance: The use of the transscleral illumination approach has the potential to simplify the optical design of fundus cameras. In particular, this approach could allow the use of smaller and cheaper cameras that are ... -
In-line and non-destructive monitoring of core temperature in sausages during industrial heat treatment by NIR interaction spectroscopy
Wold, Jens Petter; O'Farrell, Marion; Tschudi, Jon; Eskildsen, Carl Emil Aae; Andersen, Petter Vejle; Ottestad, Silje (Peer reviewed; Journal article, 2020)During industrial heat treatment of food products, the core temperature is a critical control parameter with respect to food quality and in particular food safety. This paper presents a novel prototype system based on ... -
Inline Spectroscopy: From Concept to Function
Tschudi, Jon; O'Farrell, Marion; Bakke, Kari Anne Hestnes (Journal article; Peer reviewed, 2018)The field of applied spectroscopy is strongly dominated by publications presenting proof-of-concepts, lab set-ups, and demonstrations. In contrast, the corresponding number of commercial successes of inline spectroscopy ... -
Measurements of droplets from singing and some other activities
Dunker, Tim; Tschudi, Jon; O'Farrell, Marion (Project Memo;, Report, 2020-09-07)We present initial results from measurements of exhaled droplets by two female singers during singing, speaking, laughing, and recitation of poetry. We also conducted measurements with a flute, a clarinet, a tuba, and only ... -
MEMS-tunable dielectric metasurface lens using thin-film PZT for large displacements at low voltages
Dirdal, Christopher Andrew; Thrane, Paul Conrad Vaagen; Dullo, Firehun Tsige; Gjessing, Jo; Summanwar, Anand; Tschudi, Jon (Peer reviewed; Journal article, 2022)Tunable focusing is a desired property in a wide range of optical imaging and sensing technologies but has tended to require bulky components that cannot be integrated on-chip and have slow actuation speeds. Recently, ... -
Near-Infrared (NIR) Interactance System for Non-Contact Monitoring of the Temperature Profile of Baked Liver Pâté
O'Farrell, Marion; Bakke, Kari Anne Hestnes; Tschudi, Jon; Wold, Jens Petter (Journal article; Peer reviewed, 2011)This article investigates the possibility of using non-contact interactance as a method for profiling the temperature in a processed meat product (liver pâté) as it comes out of the oven. The application was defined by an ... -
Novel NIR Transflection Measurements for Non-contact Core Temperature of processed Meat Products
O'Farrell, Marion; Tschudi, Jon; Bakke, Kari Anne Hestnes; Wold, Jens Petter; Sanden, Karen Wahlstrøm (Chapter, 2010)A novel system for online measurement of core temperature in processed meat products is presented. The system allows near infrared (NIR) light to interact with the product to a depth of up to 2cm using noncontact optics. ... -
Optimization of Instrument Design for In-Line Monitoring of Dry Matter Content in Single Potatoes by NIR Interaction Spectroscopy
Wold, Jens Petter; O'Farrell, Marion; Andersen, Petter Vejle; Tschudi, Jon (Peer reviewed; Journal article, 2021)Dry matter (DM) content is one of the most important quality features of potatoes. It defines the physical properties of the potatoes and determines what kind of product the potatoes can be used for. This paper presents ... -
Real-time super-resolved 3D in turbid water using a fast range-gated CMOS camera
Risholm, Petter; Thorstensen, Jostein Bruun; Thielemann, Jens T; Kaspersen, Kristin; Tschudi, Jon; Yates, Chris; Softley, Chris; Abrosimov, Igor; Alexander, Jonathan; Haugholt, Karl Henrik (Journal article; Peer reviewed, 2018)We present a range-gated camera system designed for real-time (10 Hz) 3D estimation underwater. The system uses a fast-shutter CMOS sensor (1280×1024 1280×1024 ) customized to facilitate gating with 1.67 ns (18.8 cm in ...