Window heating apparatus

An apparatus for detecting gas based on radiations, comprising:

• a frame comprising:
• a support member;
• and
• a ridge extending radially outward from an inner surface of the frame,
• wherein the frame further defines a groove proximal to the ridge;
• a heater assembly comprising:
• a base defining a first opening about a center axis of the base;
• at least one tooth extending radially from a periphery of the first opening;
• and
• a printed circuit board laminated on the base of the heater assembly, the printed circuit board having at least one heating element and defining a second opening, the second opening having a same diameter as the first opening, wherein the first opening and the second opening are aligned coaxially, wherein the at least one heating element is disposed on the at least one tooth and the at least one heating element is placed outside the ridge;
• and
• a glass window disposed on the heater assembly, wherein the glass window is in direct contact with the base of the heater assembly, wherein the glass window is coupled to the support member of the frame, wherein the base of the heater assembly is squeezed between the ridge of the frame and the glass window,
• wherein the groove is configured to absorb pressure applied on the glass window,
• wherein the heater assembly is disposed between the frame and the glass window, and
• wherein a channel is defined between the glass window and the frame to vent gases.