<P>PROBLEM TO BE SOLVED: To provide an apparatus for measuring component in gas for simply and rapidly measuring the composition of ash and the minor components in a gas. ??<P>SOLUTION: The apparatus 10A for measuring component in gas is one for turning ash contents or the minor components in a field under measurement in a gas into plasma to measure unburnt portions of the ash contents or the minor components in the gas. The apparatus 10A for measuring component in gas includes a pair of electrodes 12a and 12b generating plasma light P in a gas duct 11 which is the field under measurement, an optical fiber 14 for sending signal light 13 of the plasma light P to a detector (e.g. a spectroscope, an ICCD camera, etc.: not shown), and a guard member 15 for guarding the optical fiber 14 while supplying a guard flow 16 which jets out into the gas duct 11 while being supplied to the circumference of the optical fiber 14. ??<P>COPYRIGHT: (C)2010,JPO&INPIT ??
