Ultraviolet emitter for use in a flame detector and a method of making the same

A method of manufacturing an ultraviolet emitter for use in a flame detector, the ultraviolet emitter comprising a hermetically sealed, alkali rich, ultraviolet transmissive glass envelope including an envelope proximal end, an envelope distal end, a cavity disposed therein, an envelope length, an envelope exterior surface, and at least one electrode extending through the envelope proximal end into the cavity, the method comprising:

• (a) wrapping the envelope exterior surface with a conductive material;
• (b) performing a first injection of at least one non-radioactive gas into the glass envelope at a first pressure;
• (c) applying a voltage bias to the glass envelope;
• (d) baking the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope at a baking temperature for a baking duration of time;
• (e) cooling the hermetically sealed, alkali rich, ultraviolet transmissive glass envelope to a desired temperature;
• and
• (f) performing a second injection of at least one non-radioactive gas into the glass envelope at a second pressure.