公开(公告)号：US20240337621A1

公开(公告)日：2024-10-10

申请号：US18744756

申请日：2024-06-17

Applicant: NGK INSULATORS, LTD.

Inventor： Ryo HASHIKAWA ,  Yusuke WATANABE ,  Shingo TANAKA ,  Kazuki ITAMI

IPC: G01N27/407 ,  G01N27/30 ,  G01N27/41

CPC classification number: G01N27/4072 ,  G01N27/301 ,  G01N27/41

Abstract: A sensor element includes an element body provided with a measurement-object gas flow section therein, a measurement electrode, a reference electrode, a reference-gas introduction section, and a heater that heats the element body. The reference-gas introduction section has a reference-gas introduction space that is open outward of the element body and that introduces a reference gas into the element body, and also has a porous reference-gas introduction layer that causes the reference gas to flow from the reference-gas introduction space to the reference electrode. The reference-gas introduction layer has a first porous region and a second porous region in a path segment serving as a reference-gas path between the reference-gas introduction space and the reference electrode. The second porous region has a low porosity region with a lower porosity than the first porous region and is disposed closer to the reference electrode relative to the first porous region.