DETECTION METHOD FOR DEFECT OF SENSOR
First Claim
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1. A defect detection method for a sensor comprising a sensor element which includes at least one cell having a solid electrolyte layer extending in an axial direction;
- a tubular metallic member which surrounds the circumference of the sensor element; and
a fixing member which is in contact with an inner surface of the tubular metallic member and an outer surface of the sensor element and provides a seal therebetween, the cell including a pair of conductors which are formed on the solid electrolyte layer such that the conductors extend through a portion of the sensor element surrounded by the fixing member, the method comprising;
heating the tubular metallic member so as to produce a difference in dimension attributable to a difference in rate of thermal expansion between the tubular metallic member and the fixing member and a difference in rate of thermal expansion between the tubular metallic member and the sensor element; and
detecting breakage of the pair of conductors in a state where the difference in dimension is present.
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Abstract
A defect detection method for a sensor in which a fixing member provides a seal between a sensor element and tubular metallic members, the method being capable of detecting breakage of a conductor caused by breakage of the element.
16 Citations
6 Claims
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1. A defect detection method for a sensor comprising a sensor element which includes at least one cell having a solid electrolyte layer extending in an axial direction;
- a tubular metallic member which surrounds the circumference of the sensor element; and
a fixing member which is in contact with an inner surface of the tubular metallic member and an outer surface of the sensor element and provides a seal therebetween, the cell including a pair of conductors which are formed on the solid electrolyte layer such that the conductors extend through a portion of the sensor element surrounded by the fixing member, the method comprising;heating the tubular metallic member so as to produce a difference in dimension attributable to a difference in rate of thermal expansion between the tubular metallic member and the fixing member and a difference in rate of thermal expansion between the tubular metallic member and the sensor element; and detecting breakage of the pair of conductors in a state where the difference in dimension is present. - View Dependent Claims (2, 3, 4, 5, 6)
- a tubular metallic member which surrounds the circumference of the sensor element; and
Specification