Patent ID: 11933725
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 1:
2. The method according to claim 1, wherein the method is performed by using, an optical fiber device which:
has a sensor unit composed of a multimode fiber that runs through the gasoline, and
has an incoming light fiber and outgoing light fiber composed of single-mode fibers, that are optically connected to an incoming light end and an outgoing light end of the sensor unit, respectively, wherein
the sensor unit and cores of the incoming light fiber and outgoing light fiber are made of the same material, and
the diameter of the sensor unit is larger than the diameters of the cores of the incoming light fiber and outgoing light fiber, and
wherein in step (A2), the method comprises irradiating the sensor unit with a laser from the incoming light fiber side, measuring to m asure the wavelength of the irradiated laser from the outgoing light fiber side, and measuring the values related to the refractive index based on the measured wavelength.