PiezoelektričnaTlačni oddajnikis mainly based on the piezoelectric effect, which uses electrical components and other machinery to convert the pressure to be measured into electricity, and then performs related measurement work.Piezoelectric transmitters cannot be used in static measurement, because the charge after being subjected to external force can only be preserved when the loop has an infinite input impedance.But that's not actually the case.Therefore, Piezoelektrični oddajniki se lahko uporabljajo samo pri dinamičnih meritvah. Glavni piezoelektrični materiali so: amonijev dihidrogen fosfat, kalijev natrijev tartat in kremen. Piezoelektrični učinek najdemo v krementu.
When the stress changes, the change in the electric field is very small, and some other piezoelectric crystals will replace the quartz.Potassium sodium tartrate, it has a large piezoelectric coefficient and piezoelectric sensitivity, but it can only be used in places where the indoor humidity and temperature are relatively low.Dihydrogen phosphate is an artificial crystal, it can be used in high humidity and high temperature environment, so its application is very wide.With the development of technology, the piezoelectric effect has also been applied to polycrystals.For example: piezoelectric ceramics, magnesium niobate piezoelectric ceramics, niobate piezoelectric ceramics and barium titanate piezoelectric ceramics, etc. are included.
The transmitter based on the piezoelectric effect is an electromechanical conversion type and a self-generating type sensor.Its sensitive element is made of piezoelectric material, and when the piezoelectric material is subjected to external force, an electric charge will be formed on its surface,After the charge is amplified by the charge amplifier, the measuring circuit, and the impedance is transformed, it will be converted v izhodno izhodno moč, sorazmerno s prejetimi zunanjimi silami. Uporablja se za merjenje sile in neelektričnih fizičnih količin, ki jih je mogoče pretvoriti v sile, kot sta: pospešek in pritisk. Ima veliko prednosti: lahka teža, zanesljivo delovanje, preprosta struktura, visoka razmerja med signali in šumi, visoka občutljivost in signalne pasovne širine itd. Za nadoknete te pomanjkljivosti je treba sprejeti ukrepe, odporne proti vlagi, in odziv izhodnega toka je relativno slab, nato pa je treba uporabiti ojačevalnik naboja ali visoko vhodno impedanco, da instrument deluje bolje.
Čas objave: Mar-27-2022