▎ 摘　　要

NOVELTY - The infrared absorption gas sensor comprises an infrared light source (100). An ultra-thin lens (200) is attached to the infrared light source. A detector (300) receives infrared rays emitted from the infrared light source and passes through the ultra-thin lens and senses a gas component. The ultra-thin lens, the infrared light source are classified according to wavelengths and focuses are formed at different positions. The pattern (210) is a Fresnel pattern in which an opaque round band and a transparent round band are alternately arranged. The ultra-thin lens is a graphene-based flat lens. The ultra-thin lens classifies infrared rays emitted from the infrared light source into near-infrared (NIR), mid-infrared (MIR), and far-infrared (FIR) to form focuses at different positions. Infrared absorption type gas sensor. USE - Infrared absorption gas sensor using an ultra-thin lens having a Fresnel pattern. ADVANTAGE - The infrared absorption gas sensor has excellent sensitivity by detecting infrared rays collected in the focus, accurate measurement is possible even in situations where various types of gasses are mixed. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of manufacturing an infrared absorption gas sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of an infrared absorption gas sensor. Infrared light source (100) Ultra-thin lens (200) Pattern (210) First Fresnel pattern (211) Detector (300)