Behavior of the reflection coefficients of textolites under laser heating

The reflection coefficients at the wavelengths 0.63, 1.15, and 10.6 m of composite materials, heated in air by continuous CO₂ laser radiation, were determined experimentally.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 53, No. 2, pp. 258–264, August, 1987.     

Influence of the polarization azimuth of incident radiation on space-polarization characteristics of the flux reflected by composite materials

At the wavelength 0.63 m the degree of polarization, the angle of rotation of the polarization plane, and the indicatrix of the intensity of radiation reflected by the surface of composite materials before and after their heating by radiation of a CO₂ laser were measured.B. I. Stepanov Institute of Physics, Belarussian Academy of Sciences, Minsk, Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 66, No. 4, pp. 442–447, April, 1994.     

Goniophotometric laser Stokes-polarimeter

An automated Stokes-polarimeter with a rotating phase plate has been developed to measure the polarization characteristics of radiation reflected and scattered by objects at different angles to the surface. An estimate is made of the systematic error due to variation of the initial position of the fast axis of the phase plate and deviation of the phase difference of the λ/4 plate from 90°. Translated from Izmeritel'naya Tekhnika, No. 1, pp. 22–26, January, 2000.     

The Grand Alliance system for US HDTV

The US HDTV process has fostered substantial research and development activity over the last several years. The Advisory Committee on Advanced Television Service (ACATS) was formed to advise the FCC on the technology and systems suitable for delivery of high definition service over terrestrial broadcast channels. Four digital HDTV systems where tested at the Advanced Television Testing Center. All the systems gave excellent performance, but the results were inconclusive and a plan for a second round of tests was prepared. As each of the four systems where being readied for retest. The proponents of the four individual digital HDTV proposals worked together to define a single HDTV system which incorporated the best technology from the individual systems. The consortium of companies, called the Grand Alliance (GA), announced a combined system and submitted it to ACATS for consideration. After ACATS certification, the GA began construction of a prototype system to submit for laboratory testing at the end of 1994. This paper describes the video compression subsystem and the hardware prototype. The preprocessing, motion estimation, quantization, and rate control subsystems are described. The system uses bidirectional motion compensation, discrete cosine transform, quantization and Huffman coding. The resulting bitstream is input into a transport system which uses fixed length packets. The multiplex transport stream is input into the 8-VSB transmission system. Finally, the specifics of the hardware implementation are described and some simulation results are presented     

Application of Laserstar Power Meter for Determination of the Stability of Laser Radiation Power

The potential for the use of the Laserstar power meter for the determination of the stability of laser radiation power is considered. A relation is established between the discreteness of the reader and the resolution in the determination of the stability of laser power. Examples illustrating the determination of the stability of the radiating power of certain lasers are presented.     

Elements in the determination of instability in the intensity of laser radiation

The article presents a formula for estimating the component of uncertainty in the measurement of the relative statistical fluctuation of the power of laser radiation caused by a finite number of measurements of power on the basis of which instability is determined. The influence of drift on the measured radiation power is established and a formula for adding the drift and fluctuation components of the relative statistical fluctuation is checked. __________ Translated from Izmeritel’naya Tekhnika, No. 11, pp. 28–32, November, 2006     

Measurement of the spectral directional-hemispherical reflectance of materials irradiated perpendicularly to their surfaces

Translated from Izmeritel'naya Tekhnika, No. 7, pp. 30–32, July, 1992.     

Device for Measurement of the Stability of Laser Emission Power

An automated device for determining the stability of the power of continuous laser emission created in accordance with the requirements of the ISO 11554 international standard is considered. The mean value of the measured emission intensity and root-mean-square deviation from this mean value, the maximum and minimum values of the intensity and stability of the emissive power are calculated on the basis of a measurement of the intensity of laser emission expressed in terms of relative units. The measurements are performed for medium-term (1 min) and long-term (60 min) intervals.