Patent ID: 11933726
Assignee: YOKOGAWA ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A measurement method comprising:
causing an electromagnetic wave to be incident on a sample comprising a first layer and a second layer that are stacked, the electromagnetic wave being incident on the first layer;
receiving an electromagnetic wave reflected by the sample; and
detecting whether a third layer is present between the first layer and the second layer based on the electromagnetic wave that is caused to be incident on the sample and the electromagnetic wave that is received, wherein
the causing of the electromagnetic wave to be incident includes causing the electromagnetic wave to be incident on the first layer at an angle such that the electromagnetic wave is totally reflected between the first layer and the third layer and/or between the first layer and the second layer, and
the detecting of whether the third layer is present includes detecting whether the third layer is present based on a difference between absorption rates, in the second layer and in the third layer, of an evanescent wave produced when the electromagnetic wave is totally reflected.