Sökning: "Near-infrared"

Visar resultat 1 - 5 av 155 avhandlingar innehållade ordet Near-infrared.

  1. 1. Mid- and near-infrared NICE-OHMS techniques for ultra-sensitive detection of molecules in gas phase

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Thomas Hausmaninger; Ove Axner; Kyle Crabtree; [2018]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spectrometry; NICE-OHMS; trace gas detection; acetylene; methane; isotopologues; near-infrared; mid-infrared; shot-noise; optical parametric oscillator; teknisk fysik med inriktningen mikrosystemteknik; engineering science with specialization in microsystems technology;

    Sammanfattning : Noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) is a technique for ultra-sensitive detection of molecular absorption and dispersion. For highest performance, the technique combines cavity enhancement (CE) with frequency modulation (FM); while the former increases the effective interaction length between the light and the analyte by several orders of magnitudes, the latter removes the in-coupling of 1/f noise and makes the signals background free. LÄS MER

  2. 2. Stream monitoring using near-infrared spectroscopy of epilithic material

    Detta är en avhandling från Umeå : Ekologi, miljö och geovetenskap

    Författare :Jan Persson; Ingemar Renberg; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Streams; environmental monitoring; Water Framework Directive; water quality; biological impact; epilithic material; near-infrared spectroscopy; diatoms; NATURAL SCIENCES Earth sciences; NATURVETENSKAP Geovetenskap;

    Sammanfattning : The European Union Water Framework Directive (WFD), with initiatives to manage surface water resources, has increased the need for fast and inexpensive methods for monitoring conditions in streams. The objective of this thesis is to assess the potential of near-infrared spectroscopy (NIRS) of epilithic material to become such method. LÄS MER

  3. 3. Theoretical Modeling and Near-Infrared Spectroscopy Monitoring of Vial Lyophilization

    Detta är en avhandling från Umeå : Ekologi, miljö och geovetenskap

    Författare :Mikael Brülls; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; in-situ; simulation; monitoring; spectral peak area analysis; near-infrared spectroscopy; lyophilization; moisture; sublimation; vial; mathematical model;

    Sammanfattning : The research documented in this thesis was directed towards lyophilization of pharmaceuticals in vials (vial lyophilization) and it was focused on the design and control of this process. Theoretical modeling has considerable potential to guide experimental studies, thereby decreasing development time and improving the possibilities to achieve an optimal and robust process design. LÄS MER

  4. 4. Road surface characterization using near infrared spectroscopy

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Johan Casselgren; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering mechanics - Other engineering mechanics; Spektroskopi; Väglagsklassificering; Friktion; Väglagskarakterisering; Teknisk mekanik - Övrig teknisk mekanik; Experimental Mechanics; Experimentell mekanik;

    Sammanfattning : This thesis presents a technology and method for classifying and characterizing different road conditions such as dry asphalt and asphalt covered with water, ice and snow. The method uses light sources of different wavelengths to illuminate the road surface and a detector to measure the reflected light from the road surfaces, dependent on how the surface have absorbed, scattered and polarized the light it is possible to classify the road condition. LÄS MER

  5. 5. Road surface classification using near infrared spectroscopy

    Detta är en avhandling från Luleå : Luleå tekniska universitet

    Författare :Johan Casselgren; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Experimental Mechanics; Experimentell mekanik;

    Sammanfattning : Statistics shows that most traffic accidents with fatal outcome can be related to slippery road conditions. The most hazardous road conditions are the ones that are hard for the driver to detect and that appears sudden on the road. LÄS MER