公开(公告)号：US10768135B2

公开(公告)日：2020-09-08

申请号：US15855933

申请日：2017-12-27

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： I-Cherng Chen ,  Pi-Guey Su ,  Hong-Ci Syu ,  Hui-Yu Cho ,  Pin-Chou Li ,  Jian-Hong Wu ,  Ren-Der Jean

IPC: G01N27/30 ,  G01N27/27 ,  G01N27/407 ,  G01N27/406 ,  G01N33/00

Abstract: An oxidizing gas detection method and an apparatus thereof are provided for trace oxidizing gas detection. The detection method includes the following steps. First, perform an electroreduction reaction and a photoreduction reaction simultaneously to a metal oxide in which nanoconductors are distributed. Next, stop the electroreduction reaction and the photoreduction reaction, and read a resistance of the reduced metal oxide by applying a first pulse-width modulation signal. Next, provide an oxidizing gas to the reduced metal oxide, and photo-catalyze a redox reaction between the oxidizing gas and the reduced metal oxide. Next, read a resistance of the oxidized metal oxide by applying a second pulse-width modulation signal. Next, converse a concentration of the oxidizing gas according to a ratio of the resistance of the oxidized metal oxide and the resistance of the reduced metal oxide.