The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2004
Filed:
May. 27, 1998
Olaf Jach, Boeblingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A sensor element for limit current probes for determining the &lgr; value of gas mixtures and a method of calibrating such sensor elements. The sensor element has an internal and an external pump electrode arranged on a ceramic body, the internal pump electrode being arranged in a diffusion channel delimited by a diffusion barrier, and a gas intake orifice running through the ceramic substrate and the diffusion channel in a direction that is essentially perpendicular to the surface of the ceramic substrate. The diffusion resistance of the diffusion barrier can be adjusted essentially linearly by selectively changing the diameter of the gas intake orifice. Calibration is performed by selecting at least one sensor element of a production lot, whose pump voltage is, measured at a selected pump current, from which the optimum diameter of the gas intake orifice can be calculated from the deviations from the ideal values using a simple ratio.