▎ 摘　　要

NOVELTY - The gas sensor has an air inlet (2) and an air outlet (3) that are arranged on opposite sides of a cavity wall (1), and a light transmission hole (4) is arranged on the cavity wall. The light transmission hole is on a same side as the air inlet, and an elastic layer (5) covers the cavity wall. The elastic layer and the cavity wall enclose a cavity, and an electrically sensitive layer (6) is placed on the elastic layer. A source electrode (7) and a drain electrode (8) are placed on both sides of the electrically sensitive layer. The electrically sensitive layer is a graphene layer. USE - Photoacoustic effect based gas sensor. ADVANTAGE - The gas sensor has high gas concentration detecting sensitivity. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the photoacoustic effect based gas sensor. Cavity wall (1) Air inlet (2) Air outlet (3) Light transmission hole (4) Elastic layer (5) Electrically sensitive layer (6) Source electrode (7) Drain electrode (8)