{"id":7326,"date":"2021-04-19T09:38:54","date_gmt":"2021-04-19T06:38:54","guid":{"rendered":"http:\/\/journals.khnu.km.ua\/vestnik\/?p=7326"},"modified":"2021-08-05T15:14:23","modified_gmt":"2021-08-05T12:14:23","slug":"%d0%be%d0%bf%d1%82%d0%b8%d0%ba%d0%be-%d1%87%d0%b0%d1%81%d1%82%d0%be%d1%82%d0%bd%d0%b8%d0%b9-%d0%b2%d0%b8%d1%82%d1%80%d0%b0%d1%82%d0%be%d0%bc%d1%96%d1%80-%d0%b3%d0%b0%d0%b7%d1%83","status":"publish","type":"post","link":"https:\/\/journals.khnu.km.ua\/vestnik\/?p=7326","title":{"rendered":"\u041e\u043f\u0442\u0438\u043a\u043e-\u0447\u0430\u0441\u0442\u043e\u0442\u043d\u0438\u0439 \u0432\u0438\u0442\u0440\u0430\u0442\u043e\u043c\u0456\u0440 \u0433\u0430\u0437\u0443"},"content":{"rendered":"

<\/p>\n

\u041e\u041f\u0422\u0418\u041a\u041e-\u0427\u0410\u0421\u0422\u041e\u0422\u041d\u0418\u0419 \u0412\u0418\u0422\u0420\u0410\u0422\u041e\u041c\u0406\u0420 \u0413\u0410\u0417\u0423<\/p>\n

OPTICAL-FREQUENCY GAS FLOWMETER<\/p>\n

\u0421\u0442\u043e\u0440\u0456\u043d\u043a\u0438: 160-170. \u041d\u043e\u043c\u0435\u0440: \u21161, 2021 (293)<\/strong> \"\"<\/a>
\n\u0410\u0432\u0442\u043e\u0440\u0438:<\/strong>
\n\u041e.\u0412. \u041e\u0421\u0410\u0414\u0427\u0423\u041a,\u00a0 \u0412.\u0421. \u041e\u0421\u0410\u0414\u0427\u0423\u041a,
\n\u042f.\u041e. \u041e\u0421\u0410\u0414\u0427\u0423\u041a, \u0414.\u0420. \u0406\u041b\u042c\u0427\u0423\u041a, \u0413.\u041e. \u041f\u0410\u0421\u0422\u0423\u0428\u0415\u041d\u041a\u041e
\n\u0412\u0456\u043d\u043d\u0438\u0446\u044c\u043a\u0438\u0439 \u043d\u0430\u0446\u0456\u043e\u043d\u0430\u043b\u044c\u043d\u0438\u0439 \u0442\u0435\u0445\u043d\u0456\u0447\u043d\u0438\u0439 \u0443\u043d\u0456\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442
\nA.V. OSADCHUK, V.S. OSADCHUK, I.O. OSADCHUK, D.R. ILCHUK, G.O. PASTUSHENKO
\nVinnytsia National Technical University
\nDOI:<\/strong> https:\/\/www.doi.org\/10.31891\/2307-5732-2021-293-1-160-170<\/a>
\n\u0420\u0435\u0446\u0435\u043d\u0437\u0456\u044f\/Peer review :<\/strong> 22.01.2021 \u0440.
\n\u041d\u0430\u0434\u0440\u0443\u043a\u043e\u0432\u0430\u043d\u0430\/Printed :<\/strong> 10.03.2021 \u0440.<\/p>\n

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\u0434\u043e\u0441\u043b\u0456\u0434\u0436\u0435\u043d\u043d\u044f \u043c\u0430\u044e\u0442\u044c \u0433\u0430\u0440\u043d\u0438\u0439 \u0437\u0431\u0456\u0433, \u0432\u0456\u0434\u043d\u043e\u0441\u043d\u0430 \u043f\u043e\u0445\u0438\u0431\u043a\u0430 \u043d\u0435 \u043f\u0435\u0440\u0435\u0432\u0438\u0449\u0443\u0454 1,5%.
\n\u041a\u043b\u044e\u0447\u043e\u0432\u0456 \u0441\u043b\u043e\u0432\u0430:<\/strong> \u043e\u043f\u0442\u0438\u043a\u043e-\u0447\u0430\u0441\u0442\u043e\u0442\u043d\u0438\u0439 \u0432\u0438\u0442\u0440\u0430\u0442\u043e\u043c\u0456\u0440 \u0433\u0430\u0437\u0443, \u0444\u043e\u0442\u043e\u0447\u0443\u0442\u043b\u0438\u0432\u0438\u0439 \u0440\u0435\u0437\u0438\u0441\u0442\u0438\u0432\u043d\u0438\u0439 \u0435\u043b\u0435\u043c\u0435\u043d\u0442, \u0432\u0456\u0434\u2019\u0454\u043c\u043d\u0438\u0439 \u0434\u0438\u0444\u0435\u0440\u0435\u043d\u0446\u0456\u0430\u043b\u044c\u043d\u0438\u0439 \u043e\u043f\u0456\u0440, \u0447\u0430\u0441\u0442\u043e\u0442\u0430, \u0456\u043d\u0442\u0435\u0440\u0444\u0435\u0440\u043e\u043c\u0435\u0442\u0440\u0438\u0447\u043d\u0438\u0439 \u0441\u043f\u043e\u0441\u0456\u0431 \u0440\u0435\u0444\u0440\u0430\u043a\u0442\u043e\u043c\u0435\u0442\u0440\u0456\u0457.<\/p>\n

\u0420\u043e\u0437\u0448\u0438\u0440\u0435\u043d\u0430 \u0430\u043d\u043e\u0442\u0430\u0446\u0456\u044f \u0430\u043d\u0433\u043b\u0456\u0439\u0441\u044c\u043a\u043e\u044e \u043c\u043e\u0432\u043e\u044e<\/strong><\/p>\n

The paper presents a study of optical-frequency gas flowmeter based on a transistor structure with a negative differential resistance. A mathematical model of an optical-frequency flowmeter with a photosensitive resistive element has been developed. The optical-frequency gas flowmeter is based on a transistor structure with a negative differential resistance based on two bipolar transistors with a passive inductive element. An interferometric method of refractometry of optically transparent liquids and gases was used to create an optical-frequency gas flowmeter. Negative differential resistance, formed by the parallel inclusion of impedance with a capacitive component on the electrodes of the transistor structure and inductance, leads to electrical oscillations in the circuit of the autogenerator. Using the Matlab environment, the adequacy of the developed mathematical model is proved. It is established that at the output of the optical-frequency flowmeter there are periodic oscillations, the frequency of which changes with the change of the resistance of the photosensitive resistive element. Theoretical and experimental studies have shown that with increasing gas consumption from 0 l\/h to 40 l\/h increases the generation frequency from 434.250 MHz to 434.750 MHz at a supply voltage of 2.8 V, and at a supply voltage of 3.3 V from 435.250 MHz up to 435.750 MHz. It is shown that by choosing the power supply mode from the DC voltage, it is possible to obtain a linear dependence of the generation frequency on the gas flow rate and to select channels for the transmission of measurement information. The optimal supply voltage is 3.3 V, at which there is the smallest change in the generation frequency in the range from 20 o<\/sup>C to 80 o<\/sup>C. In the temperature range from 20 o<\/sup>C to 50 o<\/sup>C there is the most temperature stable operation of the optical-frequency gas flow meter. Experimental and theoretical studies have shown that the sensitivity of the developed device is 12.5 kHz\/l\/h. The obtained theoretical and experimental studies have a good match, the relative error does not exceed 1.5%.
\nKeywords:<\/strong> optical-frequency gas flow meter, photosensitive resistive element, negative differential resistance, frequency, interferometric method of refractometry.<\/p>\n

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