Patent ID: 11940326
Assignee: YOKOGAWA ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method, comprising:
irradiating, with a first irradiator, a first irradiation light having transition energy to decompose attached material attached to a boundary surface of a film, wherein the film contacts a sample subject to spectroscopic analysis;
transmitting, to an optical waveguide, the irradiated first irradiation light;
generating a first evanescent wave on a front surface of the optical waveguide, wherein the first evanescent wave is based on the first irradiation light;
projecting the first evanescent on an attached region of the attached material;
irradiating, with a second irradiator, a second irradiation light on the film, wherein the second irradiation light generates a second evanescent wave that projects onto a region of the sample;
detecting a measured light based on the second irradiation light, wherein the measured light comprises information of an absorption spectrum of the sample; and
passing the second irradiation light and the measured light through a prism, wherein
a filter, which has higher transmissivity with respect to the second irradiation light than transmissivity with respect to the first irradiation light, is disposed between the prism and the optical waveguide.