Patent ID: 11971296
Assignee: KABUSHIKI KAISHA NIHON MICRONICS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. The measurement system according to claim 11, wherein the optical probe includes a core part and a clad part arranged along an outer circumference of the core part,
wherein a working distance WD, a radius of curvature R of the incident end surface, a radiation angle γ of the emission light, an effective incident radius Se of the emission light on the incident end surface transmitted to the core part without passing through the clad part, an incident range radius Sr of the emission light on the incident end surface, a refractive index nr of the core part at an incident position of the emission light, a numerical aperture NA0 when the incident end surface is flat, a refracting angle β of the emission light in the core part, and a central radius ω at the incident position of the emission light, fulfill the following equations:

Se=R×sin(ω)

Sr=WD×tan(γ/2)

ω=±sin−1[B2/(A2+B2)]1/2 

β=sin−1{sin[sin−1(NA0)/nr]}

where A is given by A=nr×cos(β)−cos(γ/2), and B is given by B=nr×sin(β)−sin(γ/2).