Patent ID: 11913773
Assignee: LG CHEM, LTD.
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A method of non-destructively measuring a thickness of a hydrogen ion exchange reinforcement membrane for a fuel cell having a three-layer structure, the method comprising:
inputting white light into a hydrogen ion exchange reinforcement membrane for a fuel cell having a three-layer structure;
obtaining a light spectrum of the reinforcement membrane by spectrally analyzing the white light reflected by respective layers of the reinforcement membrane and converting the reflected light into an electrical signal; and
obtaining a thickness spectrum by calculating thicknesses of the respective layers of the reinforcement membrane with respect to a refractive index of the reinforcement membrane by calculating the light spectrum,
wherein the reinforcement membrane comprises a first ion exchange resin layer positioned at a first side of a porous film and a second ion exchange resin layer provided at a second side of the porous film, the first side of the porous film being opposite to the second side of the resin film,
wherein the first ion exchange resin layer has the same thickness as the second ion exchange resin layer,
wherein any one of a transfer film and a release film is attached to one side of one of the first ion exchange resin layer and the second ion exchange resin layer positioned at an outer periphery of the reinforcement membrane, and
wherein a refractive index of the one of the transfer film or the release film is different from a refractive index of the ion exchange resin layer and a refractive index of the porous film.