Patent ID: 9513211
Filing Date: 2016-12-06
CPC Classification: B23K,G01J,G01N

Claim Text:
1. A method for estimating a concentration of a carboxylic acid gas in a chamber, the carboxylic acid gas introduced into the chamber being for reaction, the method comprising the steps of: measuring a surface temperature of a same object placed in the chamber at a same point in time by using a thermometer (first thermometer) for measuring a temperature without any influence of infrared absorption by carboxylic acid, and a radiation thermometer (second thermometer) for measuring a temperature by infrared in a wavelength region that the carboxylic acid absorbs; and estimating the concentration of the carboxylic acid gas in the chamber on the basis of a temperature difference (ΔTx) between temperatures indicated by the first thermometer and the second thermometer.