Радіовимірювальні параметричні сенсори для визначення вологи в газових середовищах

Abstract

In this master's qualification work, an analysis of the current level of development of designs of radiometric parametric sensors for determining humidity in gaseous media was conducted, which allowed to identify possible ways to improve their characteristics. Analysis of the current level of design of radiometric parametric sensors for determining humidity in gaseous media has identified possible ways to improve their parameters: sensitivity, temperature stability, stability of electrical characteristics of sensors, reliability, cost and more. Radiometric parametric sensors have been developed for determining humidity in gaseous media on the basis of a bipolar-field-effect transistor structure with capacitive elements, which implements the principle of "humidity-frequency" transformation. Based on the equivalent high-frequency nonlinear circuit of the radio-measuring parametric sensor for determining the humidity in gaseous media, analytical expressions of the conversion function and the sensitivity equation are obtained. The study of electrical parameters of the radio-measuring parametric humidity sensor is carried out and their theoretical dependences are calculated. Experimental studies of a radio-measuring parametric sensor for determining humidity in gaseous media with humidity-sensitive condensers: P14 Rapid (WIRED) by Innovative sensor technology, in the measurement range is 1040 Hz /%; P14 Rapid (SMD) from Innovative sensor technology, in the same measurement range - 944 Hz /%; HCH-1000 from Honeywell, in the measuring range - 689 Hz /%; MDN capacitor of the Helium Research Institute, in the measurement range - 3500 Hz /%. A circuit solution for the humidity measurement system on the programmable logic integrated circuit EPM1270 based on CPLD MAX II from ALTERA has been developed. In the economic part, we can conclude that the use of a new product for the consumer is economically viable, because the consumer receives an economic effect from the use of 158.86 UAH, which confirms the economic feasibility of the new development. In the section of labor protection and safety in emergency situations such issues as technical solutions on occupational health and industrial sanitation, determination of parameters of exhaust general exchange artificial ventilation in the release of harmful substances and excess moisture were considered.