Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1980-10-27
1982-04-06
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2758
Patent
active
043234402
ABSTRACT:
An oxygen sensor for measuring the existence of oxygen in gases in an exhaust system or the like. An electrolytic body is formed as a tube with an open end and a closed end. An internal electrode is coated on the interior surface of the electrolytic body, and an external electrode is coated on the exterior surface of the electrolytic body. The external electrode is exposed to the gases. A tubular housing is airtightly connected around the outer circumference of the open end of the tubular electrolytic body, thus defining within it an internal space to which the internal electrode is exposed. An electrically conducting tube, coaxial with the tubular housing, is electrically connected to the internal electrode by its end closest thereto. Atmospheric air can only pass into the space within the tubular housing through a side hole in the housing which opposes a side hole in the electrically conducting tube. Between these holes there is located a blocking member which includes a tube formed of an elastomeric material formed with a side hole with corresponds to the other side holes, and a tube formed of a water repellent porous material, the part of which opposes the side holes, and which is not formed with any holes, so that it acts as a filter. One of these tubes is fitted inside the other. A lead wire connects to the other end of the electrically conducting tube and leads out from the sensor to convey electrical output signals therefrom. A protective shield is mounted over the outside of the side hole in the housing, and does not interrupt communication between this hole and the atmosphere, while it shields this hole from direct exposure to the exterior.
REFERENCES:
patent: 4057477 (1977-11-01), Weyl et al.
patent: 4088555 (1978-05-01), Kita et al.
patent: 4187163 (1980-02-01), Steinke et al.
Kaplan G. L.
Toyota Jidosha Kogyo Kabushiki Kaisha
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