The construction of a contactless adaptive vibration sensor based on an externally modulated reflectometer-type fiber-optic transducer is discussed. The sources of measurement error and ways of reducing them are determined. An experimental prototype fiber-optic contactless adaptive vibration sensor and a method for correcting its transfer function are described.
A radiation-resistant diamond-based detector for registration of fluxes of particles of cosmic radiation with low linear energy transfer is developed and investigated. The device may be used to register gamma radiation of water-moderated, water-cooled nuclear energy reactors. The characteristics of a detector when exposed to beta radiation are determined and modeling of the signals of the device when exposed to beta and gamma radiation is performed. The use of a multi-layer diamond structure makes it possible to increase the signal-to-noise ratio and expand the dynamic range of measurements of the linear energy transfer of cosmic radiation particles.
We developed a new method for measuring the pitch frequency of speech signals with elevated noise immunity. The problem of protection against intense background noise is solved in this method by the frequency selection of vocalized segments of speech signals according to a scheme with comb filter of interperiodic accumulation. The efficiency of the method is analyzed both theoretically and experimentally with the help of a multichannel frequency meter intended for the acoustic speech analysis. It is shown that, for a signal-to-noise ratio of 10 dB and higher, the error of the method does not exceed 2%.
The problem of measuring the temperatures of the radio-electrical components of printed circuits is investigated. A temperature measuring sensor (thermocouple) and possible errors are considered. A systematic error compensation method is proposed to ensure the necessary accuracy of measurements made with the temperature sensor. © 2015 Springer Science+Business Media New York
A neural network approach for processing the output data from a spectrometr with diamond detectors on a spacecraft is discussed. A mathematical apparatus for obtaining differentiable data on fluxes of electrons, protons, and heavy charged particles in 21 energy bands is proposed.
We consider the problems of measuring the temperature of objects heated in high-power microwave installations and show the advantages of using pyrometers for these purposes as compared with thermocouple temperature meters. The procedure of finding the characteristics of below-cutoff waveguides with circular cross sections intended for application in combination with pyrometric sensors is described. We also present the plots for the rapid evaluation of the geometric parameters of circular below-cutoff waveguides depending on the required inserted attenuation. An example of application of a circular below-cutoff waveguide in combination with a KM-1 pyrometer is presented.
We propose a method for designing transversely illuminated traveling-wave microwave devices. Devices of this type produce a uniform 3D temperature distribution in a polymer-composite rod. We describe theoretical and experimental results from studies of the 3D temperature distribution in the rod, along with the advantages of microwave curing technology over traditional curing techniques for polymer composites.
A diamond-based single-element ultraviolet potodetector that may be used in spectrophotometric equipment is developed. The characteristics of the spectral sensitivity of the detector as a function of tha appllied voltage are presented. The capabilities gained from the used of similar devices for systems used in the analysis of the composition of multicomponent mixture are considered.
Improvement of the standards base for optophysical measurements
An inductive time-type analog-to-digital converter for linear displacements has been developed in which the displacement-phase conversion step has been eliminated. The displacement is directly converted into a time interval and then into a digital code. The functional circuit of the converter and its mathematical description are presented. © 2015 Springer Science+Business Media New York.
The results of theoretical and experimental investigations in the area of high performance microwave technologies for the heat treatment of sheet materials are presented. Two-dimensional periodic slow-wave systems are used as the heating elements of the microwave devices. The disagreement between the theoretical and experimental temperature distribution characteristics in the sheet material and the temperature deviation from the nominal value does not exceed 3% and 5%, respectively.
The specific nature of the process of measuring the electrical characteristics of bipolar and metal-oxidesemiconductor (MOS) transistors subjected to the action of neutron, electron, and gamma irradiation is considered. An automated measurement system is developed. Examples illustrating the use of the system for investigations of the radiation hardness of transistors are presented and the parameters of SPICE models for use in circuit design are determined.
A design is proposed for microwave systems which produce a uniform temperature distribution over the transverse cross section of dielectric pipes. A method for calculating the temperature distribution over the thickness of pipes made of composite materials is examined.
An optoelectronic time-type displacement transducer with different methods of correction of frequency errors is considered. It is shown that the use of an automatic frequency control loop represents the most promising method. A functional circuit of the device is developed and the basic functional dependences are presented.
The operation principle, advantages and disadvantages of resonator sensors are considered. A method of correcting the additional errors of such sensors is proposed. An experimental investigation of the method on string resonator sensors of linear displacements is described.
Metrological support of measurements of the frequency of radiation in optical data processing systems
A mathematical model is developed for a multichannel sensor unit based on diamond detectors in a device for monitoring the parameters of cosmic ray fluxes. The output signals from these sensors are modelled as they detect ionizing radiation from outer space in different spacecraft orbits with various levels of solar activity.
A mathematical model is developed for a multichannel sensor unit based on diamond detectors in a device for monitoring the parameters of cosmic ray ﬂ uxes. The output signals from these sensors are modelled as they detect ionizing radiation from outer space in different spacecraft orbits with various levels of solar activity.