ʻO ke sensor kaomi capacitive i haku ʻia me ʻelua mau ʻāpana neʻe (elastic metal diaphragm), ʻelua mau ʻāpana paʻa (uhi metala ma ke aniani concave ma ka diaphragm elastic luna a me lalo), nā kikowaena hoʻopuka a me ka hale, a pēlā aku. Hoʻokumu ʻia ʻelua mau capacitors series ma waena o ka papa neʻe a me nā papa paʻa ʻelua. Ke hana ke kaomi intake ma ka diaphragm elastic, hana ka diaphragm elastic i ka neʻe ʻana, kahi i hoʻopaʻa ʻia e hoʻemi i ka mamao me hoʻokahi ʻāpana paʻa, a hoʻonui i ka mamao me kekahi ʻāpana paʻa (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. Ua kapa ʻia kēia ʻano ʻano he ʻano ʻokoʻa kahi e hoʻololi ʻia ai nā palena o ʻelua mau mea ʻike e ka nui like akā kū'ē ma muli o ka nui i ana ʻia.
Inā kau ʻia ka diaphragm elastic ma waena o ke kaomi ʻaoʻao a me ke kaomi lewa (ʻo ka lua o luna o ka diaphragm elastic he lewa), ʻo ke kaomi i ana ʻia ʻo ia ka papa; Inā kau ʻia ka diaphragm elastic ma waena o ke kaomi ʻaoʻao a me ka vacuum (ʻo ka lua o luna o ka diaphragm elastic e hele ana ma o ka vacuum), ua ana ʻia ke kaomi piha. Ua like ka mana o ka capacitor me ka dielectric a me kona wahi kūpono ma waena o nā papa ʻelua o ka capacitor, a ua like hoʻi me ka mamao ma waena o nā papa ʻelua, ʻo ia hoʻi, C=ε A/D, kahi ʻo ε ka dielectric constant o ka dielectric, ʻo A ka wahi kūpono ma waena o nā electrodes metala ʻelua, ʻo D ka mamao ma waena o nā electrodes metala ʻelua. Mai kēia pilina, hiki ke ʻike ʻia i ka wā e loli ʻole ai ʻelua o nā parameter a hoʻohana ʻia kekahi parameter ma ke ʻano he loli, e loli ka capacitance me ka parameter e loli nei.
Nui nā ʻano kaapuni ana i hoʻohana ʻia me ka sensor kaomi capacitive. E lawe kākou i ke kaapuni alahaka ma ke ʻano he laʻana e hōʻike i ke kumumanaʻo hana o ke kaapuni ana sensor ʻokoʻa capacitance. No ka mea, ʻo ka capacitance kahi palena AC, hoʻonāukiuki ʻia ke alahaka e AC ma o ka mea hoʻololi. ʻO ka mea hoʻololi ʻelua coil a me ka capacitance o kahi alahaka, i ka wā ʻaʻohe kaomi komo, he alahaka ma ke kaulike, a ʻelua mau waiwai capacitance e like me C0, i ka wā e like ai ka hopena o ke kaomi, kekahi o ka waiwai capacitance o C0 + delta C, kekahi waiwai capacitance o C0 - delta, C (delta C no ke kaomi waho i hoʻokumu ʻia e ka loli o ka capacitance), he alahaka ma waho o ke kaulike, Ma kahi kiʻekiʻe o ka waiwai capacitance, kiʻekiʻe nō hoʻi ka voltage, a ua hana ʻia kahi ʻokoʻa voltage ma waena o nā capacitors ʻelua, mai kahi e hoʻopuka ai ke alahaka i kahi voltage output U e hōʻike ana i ke kaomi intake.
Ka manawa hoʻouna: Sep-02-2022