Patent ID: 7265369

Claim:
A chemical detecting method, comprising: exposing a substrate for a chemical to be adsorbed thereto, to gas-to-be-monitored; enhancing the adsorption of the chemical contained in the gas-to-be-monitored to the substrate; applying an infrared light to the substrate with the chemical adsorbed thereto; analyzing the infrared light which has passed through and exited the substrate or has been reflected on the surface of the substrate to thereby identify a kind of the chemical adsorbed to the substrate and/or compute an adsorption amount of the chemical; and identifying a kind of the chemical in the gas-to-be-monitored and/or computing a concentration of the chemical, based on the amount of the chemical adsorbed to the substrate; wherein the substrate is cooled to thereby enhance the adsorption of the chemical in the gas-to-be-monitored to the substrate; and wherein the substrate is exposed to the gas-to-be-monitored after a relative humidity of the gas-to-be-monitored has been decreased.