公开(公告)号：US20250035557A1

公开(公告)日：2025-01-30

申请号：US18768699

申请日：2024-07-10

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Yan YU ,  Chuang HUANG ,  Zhixiong HOU ,  Jiangtao LIU ,  Xiang HE ,  Yongfang HUANG ,  Linan ZHAO

IPC: G01N21/78 ,  G01N33/00

Abstract: Methods, apparatuses, and systems for determining a concentration of a target gas in a sample gas. An example method of preparing a replaceable testing material for detecting a target gas in a sample gas may include preparing a solution comprising a solute and a solvent, wherein the solute comprises o-tolidine; introducing a testing material substrate to the prepared solution for a period of time; and removing at least a portion of the solvent from the testing material substrate such that the testing material substrate comprises at least a portion of the o-tolidine, and thereby forming the replaceable testing material for detecting the target gas in the sample gas.