Patent ID: 11920921
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An orientation characteristic measurement method of calculating an orientation parameter of a sample using a light source configured to output irradiation light, a detection optical fiber and receiver configured to guide detection light emitted from the sample, and a light detector configured to detect the detection light, the orientation characteristic measurement method comprising:
detecting the detection light while changing an angle formed between a line perpendicular to a surface of the sample on the emitting side of the detection light and an optical axis of the detection optical fiber and receiver, and outputting a detection signal;
acquiring a normalized angle-dependent distribution of light intensity by normalizing light intensity on the basis of an angle-dependent distribution of the light intensity obtained from the detection signal;
specifying light intensity in a predetermined local maximum area present between an angle at which the light intensity is minimized and 90° on the basis of the normalized angle-dependent distribution of the light intensity; and
calculating the orientation parameter on the basis of a predetermined linear relationship between light intensity and a value related to the orientation parameter, and the light intensity in the predetermined local maximum area, the predetermined linear relationship being determined using a predetermined film thickness and a predetermined refractive index.