A new simple and sensitive detection tube to detect hydrogen cyanide in the air has been developed. The detection tube is based on the reaction of hydrogen cyanide with 4-nitrobenzil to form a violet colored product. The reaction takes place on a carrier made of a composite material, which was prepared by pelletization of a mixture of microcrystalline cellulose and MgO. The detection tube can d...

CCD cameras are ubiquitous in research labs, industry, and hospitals for a huge variety of applications, but there are many dynamic processes in nature that unfold too quickly to be captured. Although tradeoffs can be made between exposure time, sensitivity, and area of interest, ultimately the speed limit of a CCD camera is constrained by the electronic readout rate of the sensors. One potenti...

A direct-detection Doppler lidar system is demonstrated that uses a CCD as a detector for the first time to our knowledge. The ability to use this linear device with the circular output from a Fabry-Perot etalon comes from use of a circle-to-line converter [Appl. Opt. 29, 1482 (1990)]. In addition to the gains in quantum efficiency obtained through use of this detector, the lidar system describ...

We experimentally explore the fluorescent spectrum of the Nd:YAP crystal to manifest the feasibility of tunable single- and multi-wavelength operations in the (4)F3/2 → (4)I11/2 transition. An intracavity etalon is subsequently exploited to effectively select spectral lines at 1073, 1080, and 1084 nm with the tunabilities of 0.56, 1.13, and 0.1 nm, respectively. We also experimentally obtain mu...

A new system, consisting of a double channel Fabry Perot etalon and laser diodes emitting around 780 nm is described and proposed to be used for air refractive index measurements. The principle of this refractometer is based on frequency measurements between optical laser sources. It permits quasi-instantaneous measurement with a resolution better than 10 9 − and uncertainty in the 10 8 − range...

A resolution enhancement technique for optical microlithography based on coherent multiple imaging was investigated with use of Prolith/2 (a commercial lithographic simulation tool). It was shown that a Fabry–Perot etalon placed between the mask and the projection lens of an optical stepper could be interpreted as an appropriate transmission-phase pupil-plane filter. While previous calculations...

This paper deals with the development of the WienerHopf method for solving the diffraction of waves at fine strip-slotted structures. The classical problem for diffraction of plane wave at a strip is an important canonical problem. The boundary value problem is consecutively solved by a reduction to a system of singular boundary integral equations, and then to a system of Fredholm integral equa...

A. Murariu, S. Crâsteţi, National R&D Institute for Welding and Materials Testing ISIM Timisoara, Romania, I. Samardzic, Mechanical Engineering Faculty in Slavonski Brod, Josip Juraj Strossmayer University of Osijek, Slavonski Brod, Croatia The paper presents Infrared Thermography (IRT) for non-destructive examination of the imperfections in the coatings layers deposited by Electric Arc Sprayin...

DOI : 10.12762/2016.AL12-10 Ro-vibrational CARS spectroscopy is performed on the Q-branch of N2 in the hybrid fs/ps regime. A new optical setup has been mounted using a single laser source and a spectral filtering stage based on a volume Bragg grating and a FabryPerot etalon, in order to achieve a good enough resolution. CARS spectra are recorded in ambient air at a 1 kHz repetition rate. Howev...