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

Claim 0:
1. A measurement apparatus comprising:
a generator configured to cause 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;
a receiver configured to receive an electromagnetic wave reflected by the sample; and
a controller configured to control the generator and the receiver and
detect whether a third layer is present between the first layer and the second layer based on the electromagnetic wave incident on the sample from the generator and the electromagnetic wave received by the receiver, wherein
the generator is configured to cause the electromagnetic wave to be incident 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 controller is configured to detect 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.