BACKGROUND

The present disclosure relates to a temperature sensor.

Temperature sensors including a pair of thermocouple wires are used for measuring the temperature of exhaust gas, for example, flowing through the exhaust pipe of a vehicle. Such a pair of thermocouple wires are fixed to the interior of an outer tube in a state of being insulated by an insulator such as of magnesium oxide or aluminum oxide. The outer tube has a tip end closed by a metallic material and has a base end closed by a seal such as of glass or a resin. By isolating the interior of the outer tube from the outside, the pair of thermocouple wires are prevented from being oxidized and the insulator is prevented from absorbing moisture.

SUMMARY

An aspect of the present disclosure resides in a temperature sensor including:

a pair of thermocouple wires;

a temperature measuring junction;

an outer tube;

an insulator made of an insulating material; and

a glass seal made of a glass material, wherein

the glass seal contains bubbles which are independent of each other.

It should be noted that the bracketed reference signs designated to the components in the aspect of the present disclosure indicate correspondency with the reference signs in the drawings referred to in the embodiment, and do not limit the components only to the content of the embodiment.

