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

Claim 8:
9. An orientation characteristic measurement device comprising:
an irradiation optical fiber and lens configured to irradiate 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,
a light detector configured to detect the detection light and output a detection signal,
a rotatable surface configured to change an angle formed between a line perpendicular to a surface of the sample on the light emitting side of the detection light and an optical axis of the detection optical fiber and receiver,
a circuitry configured to control the rotatable surface so that the formed angle is changed, and calculate an orientation parameter of the sample on the basis of the detection signal obtained while changing the formed angle,
wherein the circuitry is configured to:
acquire 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;
specify 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
calculate 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.