Browsing by Author "Farsund, Øystein"
Now showing items 1-12 of 12
-
Comparison of 294 nm and 355 nm excitation wavelengths in UVLIF standoff detection of biological aerosols released in a semi-closed chamber
Farsund, Øystein; Rustad, Gunnar; Skogan, Gunnar (2012-02-07)FFI has previously developed a lidar for standoff detection of biological aerosols based on ultraviolet laser induced fluorescence, using an excitation wavelength at 355 nm. A 294 nm laser source has been developed and ... -
Design of a high pulse energy coherent ultraviolet source - simulations and experimental design
Rustad, Gunnar; Farsund, Øystein (2013-02-01)The report discusses design considerations and numerical simulations of different system architectures for generation of several tens of mJ pulse energy in the ultraviolet range around 290- 300 nm. The architectures ... -
High pulse energy and symmetrical far field from an optical parametric oscillator in the red spectral range
Rustad, Gunnar; Farsund, Øystein (2011)Red pulses with >30 mJ energy and <0.6 nm bandwidth have been demonstrated using a type 2 phase matched optical parametric oscillator pumped at 532 nm. A symmetrical signal beam with beam diameter-divergence product of ~3 ... -
High-pulse-energy, linear optical parametric oscillator with narrow and symmetrical far field
Farsund, Øystein; Rustad, Gunnar (2013)A new method to obtain a narrow and symmetrical far field from a high-pulse-energy optical parametric oscillator (OPO) with a linear resonator has been tested. The OPO employs two identical nonlinear crystals that are cut ... -
Optical parametric oscillators with high pulse energy and beam quality
Rustad, Gunnar; Farsund, Øystein; Arisholm, Gunnar (2010)A new method for obtaining high beam quality from high pulse energy optical parametric oscillators (OPOs) is demonstrated. By using different nonlinear crystals that have walk-off in orthogonal directions but are type 2 ... -
Optimal classification of standoff bioaerosol measurements using evolutionary algorithms
Nyhavn, Ragnhild; Moen, Hans Jonas Fossum; Farsund, Øystein; Rustad, Gunnar (2011)Early warning systems based on standoff detection of biological aerosols require real-time signal processing of a large quantity of high-dimensional data, challenging the systems efficiency in terms of both computational ... -
Sensor installation on KNM Skjold prior to firing tests April 2000
Farsund, Øystein; Sagvolden, Geir; Pran, Karianne; Wang, Gunnar (2000)This document describes the installation of resistive strain gauges, Bragg grating strain sensors, pressure sensors and accelerometers prior the cannon firing tests carried out on KNM Skjold in April 2000. Figures of the ... -
Standoff detection of biological aerosols by means of UV-laser induced fluorescence : results from Umeå trial 2006
Farsund, Øystein; Rustad, Gunnar (2008)The objective of standoff detection is to enable early warning in case of a biological warfare agent attack. FFI has built a demonstrator employing ultraviolet laser induced fluorescence of biological aerosols. The field ... -
Standoff detection of biological aerosols by UV-laser induced fluorescence
Rustad, Gunnar; Farsund, Øystein (2008)Denne rapporten beskriver et eksperimentelt instrument som kalles biolidar og som er utviklet ved FFI i perioden 2005-2007. Biolidaren har som formål å oppdage aerosoler med biologisk innhold for å kunne gi tidlig oppdagelse ... -
Standoff detection of biological agents using laser induced fluorescence - a comparison of 294 nm and 355 nm excitation wavelengths
Farsund, Øystein; Rustad, Gunnar; Skogan, Gunnar (2012)Standoff detection measuring the fluorescence spectra of seven different biological agents excited by 294 nm as well as 355 nm wavelength laser pulses has been undertaken. The biological warfare agent simulants were released ... -
Strain measurements : a comparison of strain gauge and fiber bragg grating measurements on KNM Skjold
Farsund, Øystein; Pran, Karianne; Wang, Gunnar; Sagvolden, Geir (1999)Strain measurements by means of resistive strain gauges and fiber optic Bragg gratings during the sea-keeping tests of KNM Skjold have been analyzed and compared. The resistive strain gauge measurements were severely ... -
Sum-frequency generation of high-energy and hig-beam-quality ultraviolet pulses
Farsund, Øystein; Rustad, Gunnar (2011)Sum-frequency generation of UV pulses exceeding 25 mJ and with beam quality has been demonstrated by mixing the third harmonic pulses of a flash lamp pumped 1.06 μm Nd:YAG laser with 1.7 μm pulses from an optical parametric ...