Unexpected large waves known as freak or rogue are a phenomenon emerging in the World Ocean and causing significant damage to vessels coastal structures. These often associated with deep-water waves; however, they can also be dangerously close shore. The present study is devoted numerical modeling of sea state parameters ones wave event that happened Tillamook Bay, Oregon, on 25 January 2007. P...

Mid-infrared frequency modulation spectroscopy (FMS) in a tellurite hollow-core antiresonant fiber (HC-ARF) is investigated for gas detection. The spectroscopic system demonstrated nitric oxide (NO) detection by exploiting its strong absorption line at 1900.08 cm−1 with quantum cascade laser (QCL). By modulating the injection current of QCL 250 MHz and measuring NO 35 cm long HC-ARF, we achieve...

The PEPSIOS spectrometer is an association of three Fabry-Perot interferometers in series with an interference filter. The parameters of the optical elements are chosen such that isolation of a single common peak is achieved. This system offers the Fabry-Perot advantage to studies of absorption spectra, and the improved instrumental profile suggests application to problems requiring high contra...

We report on an in-band-pumped Dy-doped ZBLAN fiber laser with tunable emission wavelength in the mid-IR range from 2.925 to 3.250 $\mu$ m and single-frequency operation. Using combination of intracavity germanium etalon a reflective di...

In measurement systems operating under various disturbances the probabilistic characteristics of noises are usually known approximately. To improve observation accuracy, a new approach to Kalman’s filter adaptation is proposed. this approach, Covariance Matrix Measurement Noises (CMMN) estimated by accurate measurements detected irregularly mobile object system (from radiofrequency identifiers,...

Major modifications are made to the setup and signal processing of method in-situ measurement pitch a diffraction grating based on angles diffracted optical frequency comb laser emanated from grating. In method, improvement uncertainty can be expected since every mode in utilized. Instead employing Fabry-Pérot etalon for separation neighboring modes group beams, weight-of-mass is introduced det...

Fabry-Perot (FP) etalons are used as filters and sensors in a range of optical systems. The reflected transmitted fields associated with an FP etalon have traditionally been predicted by the Airy function, which assumes plane wave illumination. are, however, often illuminated non-collimated beams, rendering function invalid. To address this limitation, we describe angular calculates for arbitra...