Imager with array of multiple infrared imaging modules

A method comprising:

• receiving electromagnetic radiation from a scene at a plurality of infrared imaging modules arranged in a lattice configuration having a plurality of rows and a plurality of columns of the infrared imaging modules positioned on a shared base, disposed in a housing of an imaging system, and adapted to image a scene, wherein each of the infrared imaging modules comprises:
• a module housing,
• an optical element adapted to receive infrared radiation from the scene,
• an array comprising a plurality of infrared sensors arranged in a plurality of rows and a plurality of columns of the sensors disposed in the module housing and adapted to capture an image of the scene based on the infrared radiation received through the optical element,
• wherein a first one of the imaging modules is adapted to capture a first image of a first wavelength range of the infrared radiation, and
• wherein a second one of the imaging modules is adapted to capture a second image of a second wavelength range of the infrared radiation different from the first wavelength range;
• and
• comparing, by a processor, the first and second images to determine a presence of gas in the scene.