Sökning: "heterodyne detection"
Visar resultat 1 - 5 av 15 avhandlingar innehållade orden heterodyne detection.
1. Coherent CO2 laser radar in active imaging systems
Sammanfattning : .... LÄS MER
2. NbN Hot Electron Bolometric Mixers for a Quasi--Optical THz Receiver
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
3. Low and High Tc Bolometer Detectors for THz Frequencies
Sammanfattning : .... LÄS MER
4. Mid- and near-infrared NICE-OHMS : techniques for ultra-sensitive detection of molecules in gas phase
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
5. Laser-based absorption spectrometry : development of NICE-OHMS towards ultra-sensitive trace species detection
Sammanfattning : Laser-based absorption spectroscopy (AS) is a powerful technique for qualitative and quantitative studies of atoms and molecules. An important field of use of AS is the detection of species in trace concentrations, which has applications not only in physics and chemistry but also in biology and medicine, encompassing environmental monitoring, regulation of industrial processes and breath analysis. LÄS MER
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