公开(公告)号：US11953463B2

公开(公告)日：2024-04-09

申请号：US17068278

申请日：2020-10-12

Applicant: DENSO CORPORATION

Inventor： Kazutoshi Kodama

IPC: G01N27/406 ,  G01N27/407

CPC classification number: G01N27/4065 ,  G01N27/4067 ,  G01N27/4072

Abstract: There is provided a method of producing a gas sensor element capable of detecting a concentration of specific ions based on a limiting current passing between a first electrode and a second electrode according to a concentration difference of the specific ions. The method includes a temperature raising step, a current measuring step and a control step. In the temperature raising step, a heater is energized to raise temperature of a solid electrolyte. In the current measuring step, a voltage is applied across the first and second electrodes and to measure a limiting current. In the control step, a part of a diffusion resistance layer is removed from the gas sensor element by using an ultrashort pulsed laser to control a diffusion length that is a length of an introduction path to maintain the limiting current to be within a final standard range.

公开(公告)号：US10809239B2

公开(公告)日：2020-10-20

申请号：US14945742

申请日：2015-11-19

Applicant: DENSO CORPORATION

Inventor： Kazutoshi Kodama ,  Hirofumi Noda

IPC: G01N33/00

Abstract: A gas sensor is provided which includes a hollow metallic housing, a sensor device installed in the housing, and a seal disposed in the housing to hermetically isolate between the housing and the sensor device. The housing has an inner shoulder formed on an inner periphery thereof. The seal is retained on the inner shoulder. The seal is made up of a powder body and a glass body. The powder body is made of inorganic powder and mounted on the inner shoulder. The glass body is arranged on the powder body and has a varying coefficient of thermal expansion which alleviates a difference in thermal expansion between the sensor device and the housing, thereby ensuring the stability of hermetic sealing ability of the seal in high-temperature environments.