The paper approaches the process of testing for analogue quality transmission over plastic optical fiber (POF) system. For this purpose, we have designed a transmitting/ receiving interface built around TO082 (a wide bandwidth dual JFET input operational amplifier, with low input current and voltage noise), with programmable amplification controlled by microcontroller. A signal generator injects standard audio signal and the microcontroller evaluates the attenuation caused by the POF in the case of new, and five-year use of optical fiber. The measurements prove the "aging" of the fibers, with deterioration of the attenuation parameter.
An automatic tester was developed for optical fiber transmission system over its performance parameters during optical fiber lifetime. For this purpose, we have designed a signal conditioning module for fiber optic waveguides. For sending and receiving data over optical fiber we have used a typical TTL adapter built with MC10H116 (a triple differential amplifier designed for use in sensing differential signals over long lines). A microcontroller- based system is used to measure the correspondence between a sending and receiving of a string sequence over a glass optical fiber probes. The measurements prove the “aging” of the fibers, with deterioration of the speed parameter.
This present paper approaches the field of methods of measurement of electrical parameters of solid polymer materials, using new techniques to ensure high level accuracy as well as controlling and minimizing errors. To achieve this goal we designed an original measuring stand with a single microwave oscillator and two measuring arms. Using this measurement method, it is possible to control and eliminate the amplitude variations, depending on the frequency variations of the Gunn diode, so that for any microwave frequency range 8.5 - 9.5 GHZ, the amplitude of the input signal in the measuring system is kept constant. The measurement installation is intended for microwave absorption measurements for electrically insulating solid polymeric substances.
Electrical devices for operation in potentially explosive atmospheres are designed and built in accordance with European standard EN 50015: 1995 ex. the pressurized enclosure "p". The type of protector p, by using a protective gas in the housing is intended to prevent the formation of an explosive atmosphere within it, while maintaining an overpressure to the surrounding atmosphere and, where appropriate, by the use dilution. Research conducted for pressurized encapsulation aimed at developing new procedures for determining the parameters of pressurization to allow safe use of electrical appliances.
Pressurization with compensation for losses allegedly maintaining overpressure inside the enclosure when the outlets are closed, is made by feeding protective gas in an amount sufficient to fully compensate for losses from the housing inevitable pressurized and its associated pipework. The conditions and necessary measures that are required for appliances and equipment with potential ignition of explosive atmospheres are detailed in the SR EN 50016/2000. For pressurized encapsulation protection mode, the electric equipment can be maintained safety by the overpressure created inside them and in the supply pipes with air.
The paper presents a modern method to determine the parameters of the electric equipment with pressurization enclosures. For controlling of such equipment, a specific algorithm has been developed and laboratory tested.
The separation column used for experimentations one model can be configured in two ways: one - two columns of different
diameters placed one within the other extension, and second way, one column with set diameter , . The column
separates the carbon isotopes based on the cryogenic distillation of pure carbon monoxide, which is fed at a constant flow rate
as a gas through the feeding system ,.
Based on numerical control systems used in virtual instrumentation was done some simulations of the distillation process in
order to obtain of the isotope 13C at high concentrations. The experimental installation for cryogenic separation can be
configured from the point of view of the separation column in two ways: Cascade - two columns of different diameters and
placed one in the extension of the other column, and second one column with a set diameter. It is proposed that this
installation is controlled to achieve data using a data acquisition tool and professional software that will process information
from the isotopic column based on a logical dedicated algorithm. Classical isotopic column will be controlled automatically,
and information about the main parameters will be monitored and properly display using one program.
Take in consideration the very-low operating temperature, an efficient thermal isolation vacuum jacket is necessary. Since the
“elementary separation ratio”  is very close to unity in order to raise the (13C) isotope concentration up to a desired level,
a permanent counter current of the liquid-gaseous phases of the carbon monoxide is created by the main elements of the
equipment: the boiler in the bottom-side of the column and the condenser in the top-side.