Radiomeasuring microelectronic transducers of physical quantities

Tool Control the Concentration of Carbon Dioxide in the Flue Gas Boilers Based on the Optical Absorption Method

“…An analytical model of the spectral distribution of gas absorption coefficients calculated on the basis of tables of the intensity of the lines S (λ 0 ) of the radiation of the gases in the indicated spectral range, which corresponds to the calculation of the absorption value in the range 4.1-4.3 microns (2300-2400 cm -1 ), was used the following approximation [10,11,14]:  The spectrum of the absorption coefficient of gas is described by the sum of the Lorentz distributions with different λ 0 and S(λ 0 ), but the same values of σL;  The spectra of absorption coefficients of all gases are given in the spectral band of 2300-2400 cm -1 (wavelengths of 4.1-4.3 microns) in increments of 0.01 cm -1 . The fulfilment of this condition is necessary for the convenience of analysing gas mixtures and taking into account the influence of influent gases;  The model takes into account only the lines having the intensity S≥0.1 [cm • atm] under normal conditions of measurement.…”

Optical Frequency Transducer Based on Dual-Gate Mosfet With an Active Inductive Element

“…However, this inductor has a low Q-factor and its dimensions on the frequencies of 10 6 Hz are not compatible with the dimensions of transducer semiconductor chip [11]. Thereby, application of inductive character of the impedance bipolar transistor VT4 with a phase shift RC-circuit as an oscillator circuit inductor was proposed to solve this problem.…”

Radiomeasuring pressure transducer with sensitive MEMS capacitor

“…Using frequency signal as an informative eliminates the analog-to-digital converters, increases efficiency measuring apparatus [1,8]. Currently intensive research on the properties of analog microelectronic pressure transducers is carrying out [2,3], although the study the frequency of pressure transducers based on the reactive properties of bipolar and field-effect transistors is in an initial stage [4][5][6][7]. Therefore, this paper is dedicated to the study of the function of transformation and equation of sensitivity of the radiomeasuring pressure transducer on the basis of transistor structure with negative resistance.…”