Sökning: "optical detection"

Visar resultat 16 - 20 av 357 avhandlingar innehållade orden optical detection.

1. 16. Elastic Neutron Scattering at 96 MeV

   Författare :Joakim Klug; Jan Blomgren; Arjan Plompen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; neutron; detection; CsI; elastic scattering; differential cross section; optical potential; kerma; Kärnfysik; Nuclear physics; Kärnfysik; Applied Nuclear Physics; Tillämpad kärnfysik;

   Sammanfattning : A facility for studies of elastic neutron scattering in the 50–130 MeV range has been developed. In addition to elastic neutron scattering, it has been used for (n,p) and (n,d) reaction experiments. The performance of the device has been illustrated in measurements of the (n,p) and (n,n) cross sections on 1H and 12C. LÄS MER

3. 17. Single-Molecule Detection and Optical Scanning in Miniaturized Formats

   Författare :Jonas Melin; Fredrik Nikolajeff; Mats Nilsson; Hugh Fan; Uppsala universitet; []
   Nyckelord :Biotechnology; microfluidics; single-molecule detection; MOEMS; μTAS; lab-on-a-chip; RCA; thermoplastics; injection molding; hot embossing; Bioteknik;

   Sammanfattning : In later years polymer replication techniques have become a frequently employed fabrication method for microfluidic and micro-optical devices. This thesis describes applications and further developments of microstructures replicated in polymer materials. LÄS MER

4. 18. NbN Hot Electron Bolometric Mixers for a Quasi--Optical THz Receiver

   Författare :Matthias Kroug; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; bolometric mixer; superconducting NbN; heterodyne detection; hot electron effect; quasi-optical;

   Sammanfattning : Experimental work on the development of a quasi-optical heterodyne receiver for the THz frequency range is reported. The mixing device is a superconducting hot electron bolometer (HEB) made from ultrathin, d = 3 - 5 nm, niobium nitride (NbN) films. LÄS MER

5. 19. Multidimensional Modulation Formats for Coherent Optical Communication Systems

   Författare :Tobias Eriksson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; binary pulse position modulation QPSK; Fiber-optical communication; spectral efficiency; power efficiency; multidimensional position modulation.; 16-ary quadrature amplitude modulation 16QAM ; quadrature phase shift keying QPSK ; coherent detection; polarization-switched quadrature phase shift keying PS-QPSK ; 128-level set-partitioning QAM 128-SP-QAM ;

   Sammanfattning : Coherent optical receivers have enabled the use of multilevel modulation formats with high spectral efficiencies and long transmission reaches. Traditionally, modulation formats utilizing the two dimensions spanned by the amplitude and the phase of the signal have been dominating. LÄS MER

7. 20. Estimation and detection of transmission line characteristics in the copper access network

   Författare :Fredrik Lindqvist; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Digital subscriber line; DSL; line qualification; twisted-pair line; copper access network; cable modeling; crosstalk channel estimation; estimation; detection;

   Sammanfattning : The copper access-network operators face the challenge of developing and maintaining cost-effective digital subscriber line (DSL) services that are competitive to other broadband access technologies. The way forward is dictated by the demand of ever increasing data rates on the twisted-pair copper lines. LÄS MER