ʻO ka loina hana a me ka hoʻohui ʻana o ka sensor capacitive pressure

ʻO ka capacitive pressure sensor ua haku ʻia ʻelua mau ʻāpana neʻe (elastic metala diaphragm), ʻelua mau ʻāpana paʻa (ka uhi metala ma ke aniani concave ma luna a me lalo elastic diaphragm), nā hopena puka a me ka hale, a pēlā aku. papa a me na papa paa elua.Ke hoʻoikaika ka intake i ka diaphragm elastic, e hoʻohua ka diaphragm elastic i ka neʻe ʻana, i hoʻopaʻa ʻia e hoʻemi i ka mamao me kahi ʻāpana paʻa, a hoʻonui i ka mamao me kahi ʻāpana paʻa ʻē aʻe (hiki ke hōʻike ʻia e kahi ʻāpana pepa).ʻO ka mamao ma waena o ʻelua mau electrodes metala kekahi o nā mea nui e pili ana i ka capacitance, piʻi ka mamao, emi ka capacitance, emi ka mamao, piʻi ka capacitance.Kapa ʻia kēia ʻano ʻano hale ʻokoʻa kahi i hoʻololi ʻia ai nā ʻāpana o nā mea ʻike ʻelua e ka nui like akā kūʻē ma muli o ka nui i ana ʻia.

Inā hoʻokomo ʻia ka diaphragm elastic ma waena o ke kaomi ʻaoʻao a me ke kaomi lewa (ʻo ka lua o luna o ka diaphragm elastic ka lewa), ʻo ka pākaukau i ana ʻia;Inā hoʻokomo ʻia ka diaphragm elastic ma waena o ke kaomi ʻaoʻao a me ka ʻūhā (e hele ana ka lua o luna o ka diaphragm elastic i loko o ka ʻōpala), ua ana ʻia ke kaomi piha.Ua like ka mana o ka capacitor i ka dielectric a me kona wahi pili pono ma waena o nā papa ʻelua o ka capacitor, a hoʻohālikelike ʻia me ka mamao ma waena o nā papa ʻelua, ʻo ia hoʻi, C=ε A/D, kahi o ε ka dielectric mau. o ka dielectric, A oia ka pili pono ma waena o na metala electrodes, D ka mamao ma waena o elua metala electrodes.Mai kēia pilina, hiki ke ʻike ʻia ke hoʻololi ʻole ʻia ʻelua o nā ʻāpana a hoʻohana ʻia ka ʻāpana ʻē aʻe ma ke ʻano he loli, e hoʻololi ka capacitance me ka hoʻololi ʻana.
Nui nā ʻano ana kaʻapuni i hoʻohana ʻia me ka sensor kaomi capacitive.E lawe kākou i ke alahaka kaapuni i laʻana e hōʻike i ke kumu hana o ka capacitance differential sensor ana kaapuni.No ka mea, ʻo ka capacitance kahi ʻāpana AC, hauʻoli ke alahaka e AC ma o ka transformer.Transformer elua coil a me ka capacitance o ke alahaka, ke ole inlet kaomi, he alahaka ma ke kaulike, a elua capacitance waiwai like me C0, i ka hopena puʻe, kekahi o ka capacitance waiwai o C0 + delta C, kekahi capacitance waiwai o C0 - delta. , C (delta C no ke kaomi o waho ma muli o ka hoʻololi ʻana o ka capacitance), he alahaka ma waho o ke kaulike, kahi i kiʻekiʻe ai ka waiwai o ka capacitance, kiʻekiʻe hoʻi ka uila, a ua hoʻokumu ʻia kahi ʻokoʻa uila ma waena o nā capacitors ʻelua, mai laila mai ka Hoʻopuka ke alahaka i kahi puka uila U e hōʻike ana i ke kaomi intake.