Vol.11, No 1, 2013 pp. 75-84
UDC
621.317.39
BRIDGE MEASURING CIRCUITS IN THE STRAIN GAUGE SENSOR CONFIGURATION
Jelena Manojlović, Predrag Janković
University of Niš, Faculty of Mechanical Engineering, Serbia
In engineering sciences student education, electrical measurement of mechanical quantities can often be found. It is also widely used in engineering applications force measurements, particularly in machine tools. Load sensors, which are frequently used in mechanical engineering research, use strain gauges, bonded to a metal beam, to measure bidirectional force. The applied force induces extremely small changes in the resistance of strain gauges. In order to measure strain with a bonded resistance strain gauge, they must be connected to an electrical bridge measuring circuit. Strain gauge transducers usually employ four strain gauge elements, electrically connected to form a Wheatstone bridge circuit. The aim of this paper is to present the strain gauge conjunction with various measuring circuits, especially in Wheatstone bridge configuration. Also, the model for student education in the field of electrical measurement will be presented.
Key words:
Measurements, Strain Gauge Sensor, Measuring Circuits, Wheatstone Bridge, Student Education
MERNI MOSTOVI KOD SENZORA NA BAZI MERNIH TRAKA
Električno merenje mehaničkih veličina je često u podučavanju studenata inženjerstva. Ono se široko primenjuje kod merenja sile, posebno pri radu alatnih mašina. Senzori sile koriste merne trake povezane na elastični merni element za merenje spoljašnjeg opterećenjea - sile. Primenjena sila proizvodi male promene u otpornosti mernih traka. U cilju merenja deformacije otporne merne trake, moraju biti vezane u električno kolo. Pretvrarači na bazi mernih traka obično koriste četiri merne trake vezane u električno kolo pri čemu formiraju Vitstonov most. Cilj ovog rada je da opiše vezu između mernih traka u različitim mernim kolima, a posebno konfiguraciju Vitstonovog mosta. Takođe će biti predstavljen model u obrazovanju studenata u oblasti merenja mehaničkih veličina električnim putem.
Ključne reči:
merenje, merne trake, merna kola, Vitstonov most, obrazovanje
