Abstract
The paper presents a study of a solid state radio-measuring optical-frequency transducer of gas consumption based on a transistor structure with a negative differential resistance. A mathematical model of a solid state radio-measuring optical-frequency flowmeter was developed, which made it possible to obtain the conversion function and the sensitivity equation. The solid state radio-measuring optical-frequency gas flowmeter is based on a transistor structure with a negative differential resistance, consisting of a HEMT field-effect transistor and a bipolar transistor with a passive inductive element. When replacing the passive inductance with an active inductive element, the transducer can be completely integrated. The negative differential resistance formed by the parallel connection of the impedance with the capacitive component on the collector-drain electrodes of the transistor structure and inductance leads to the occurrence of electrical oscillations in the oscillator circuit. Theoretical and experimental studies have shown that with an increase in gas consumption from 0 l/h to 4 l/h, the generation frequency decreases from 812.65 MHz to 811.62 MHz at a supply voltage of 3.3 V, and at a supply voltage of 3.8 V from 813.00 MHz to 811.80 MHz. It is shown that by choosing a constant voltage power supply mode, it is possible to obtain an almost linear dependence of the generation frequency on the gas flow rate and choose channels for transmitting measurement information. The obtained theoretical and experimental studies are in good agreement, the relative error does not exceed 2.5 %.
Highlights
At the present stage of development of solid-state electronics and scientific and technological progress, the main directions of development of micro- and nanoelectronics are to improve existing and create new methods and means of collecting, processing, storing and transmitting information on the one hand, and on the other - creating high-precision and sensitive systems automation and control for industry, transport, military equipment, medicine, household purposes, etc. [1, 4,5,6,7,8]
The aim of the work is to develop and study a solid state radio-measuring optical-frequency transducer of gas consumption based on a transistor structure with negative differential resistance
The solid-state radio-measuring gas flow rate transducer contains a light source 1, which is an AsGa light-emitting diode of the CQY36N type, a semitransparent plate 2 on the optical axis of the beam, a light beam 3, which is reflected from a semitransparent plate 2 and through optical glass plates 4, 5 hits the mirror 6, and the light beam 7 passes through the semitransparent plate 8 to the additional mirror 9 and through the optical glass plates 10, hits the mirror 12, the rays reflected from the mirrors 6 and fall into the unit for measuring the optical path difference
Summary
At the present stage of development of solid-state electronics and scientific and technological progress, the main directions of development of micro- and nanoelectronics are to improve existing and create new methods and means of collecting, processing, storing and transmitting information on the one hand, and on the other - creating high-precision and sensitive systems automation and control for industry, transport, military equipment, medicine, household purposes, etc. [1, 4,5,6,7,8]. At the present stage of development of solid-state electronics and scientific and technological progress, the main directions of development of micro- and nanoelectronics are to improve existing and create new methods and means of collecting, processing, storing and transmitting information on the one hand, and on the other - creating high-precision and sensitive systems automation and control for industry, transport, military equipment, medicine, household purposes, etc. Among the transducers of non-electrical quantities, an important place is occupied by transducers of the flow rate of gas and liquids, which recently have a wide range of applications. They are necessary for scientific research, for the control of technological processes, for the control of the operation of power plants, for the control of airplanes and spaceships. Precision gas flow transducers are required in medical technology [9]
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