20.500.12556/RUL-166030 Merjenje dinamičnega tlaka s kondenzatorskim mikrofonom pri kalibraciji sfigmomanometrov Dynamic Pressure Measurement with a Condenser Microphone for Sphygmomanometer Calibration V sklopu doktorske disertacije smo zasnovali, izdelali, testirali in ovrednotili sistem za merjenje zračnega tlaka v manžeti in ceveh pri merjenju ali simulaciji krvnega tlaka. Po naših ugotovitvah gre za novo metodo merjenja dinamičnega tlaka v plinih. Merilni sistem za svoje delovanje uporablja visokotlačni kondenzatorski mikrofon in RF princip pretvarjanja sprememb kapacitivnosti v napetostni signal. V ta namen smo raziskali teorijo kondenzatorskega mikrofona, različne tehnike implementacije RF mikrofonov in metode merjenja krvnega tlaka. Zahtevano frekvenčno delovno območje RF mikrofona je bilo od 0,5 Hz do 280 Hz z najvišjim delovnim tlakom 300 mmHg, čemur smo zadostili. Ovrednotili smo ključne metrološke karakteristike izdelanega merilnega sistema z RF mikrofonom in določili njegovo skupno razširjeno merilno negotovost, ki je znašala ±4,0 mmHg. V namen testiranja smo izdelali NF zvočni vir, s pomočjo katerega smo določili frekvenčno karakteristiko RF mikrofona. Rezultate smo ovrednotili z uporabo simulatorja krvnega tlaka ter opravili primerjavo z referenčnim piezouporovnim tlačnim senzorjem. Z izvedbo RF mikrofona smo omogočili sledljivost sfigmomanometrov in simulatorjev krvnega tlaka na realizacijo tlaka v akustiki po t.i. recipročni metodi. Prednost merjenja krvnega tlaka s pomočjo mikrofona v primerjavi s piezouporovnimi senzorji je možnost natančnejšega merjenja dinamičnega tlaka, ki je v metrologiji manj raziskano področje. This thesis addresses design, production, testing and evaluation of a system that measures air pressure inside the cuff and tubing during measurement or simulation of blood pressure. According to our findings, this is a novel method for measuring dynamic pressure in gases. The measurement system uses a high-pressure condenser microphone with an RF principle of converting changes in capacitance into a voltage signal. We investigated condenser microphone theory, different RF microphone implementation techniques and blood pressure measurement methods. Required frequency range of the constructed RF microphone was from 0,5 Hz to 280 Hz with maximum operating pressure of 300 mmHg, both of which were met. By evaluating key metrological characteristics of the RF microphone we determined total expanded measurement uncertainty, which was ± 4,0 mmHg. An LF sound source was built for testing purposes, in order to determine RF microphone frequency response. The results were evaluated using a blood pressure simulator and compared with a reference piezoelectric pressure sensor. Described RF microphone implementation enables traceability of sphygmomanometers and blood pressure simulators to the acoustic pressure realisation by the so-called reciprocal method. The advantage of measuring blood pressure with the help of a microphone compared to piezoresistive sensors is the possibility to measure dynamic pressure more accurately, which is still insufficiently researched area of metrology. krvni tlak RF mikrofon sfigmomanometer kalibracija blood pressure RF microphone sphygmomanometer calibration true false false Slovenski jezik Angleški jezik Doktorsko delo/naloga 2024-12-18 11:45:01 2024-12-18 11:45:09 2024-12-20 07:33:08 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 60081 219968771 Tomazini_Zan_-_Merjenje_dinamicnega_tlaka_s_kondenzatorskim_mikrofonom_pri_kalibraciji_sfigmoman.pdf Tomazini_Zan_-_Merjenje_dinamicnega_tlaka_s_kondenzatorskim_mikrofonom_pri_kalibraciji_sfigmoman.pdf 1 9D85E8FAB44E51AA719765F8C1B32672 11f2cca36ad5a4ffda885f5391c137ea7d5f807774f7a2b5568a170a6821b332 9f103f22-bd2c-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=197400 Fakulteta za elektrotehniko 0 0 0