Optics: measuring and testing – Angle measuring or angular axial alignment – With photodetection remote from measured angle
Patent
1998-06-24
1999-11-16
Buczinski, Stephen C.
Optics: measuring and testing
Angle measuring or angular axial alignment
With photodetection remote from measured angle
3561393, 356376, 702167, 222437, G01B 1126, G01B 1124, G01F 1128
Patent
active
059867507
ABSTRACT:
By the side of a powdery or granular material stacked in a conical pile on a horizontal surface, a sensor that emits sensor light and, by receiving light reflected from a spot illuminated by the sensor light, detects the distance to the pile of the powdery or granular material is placed with the optical axis of the sensor light horizontal. While the sensor is moved in a horizontal direction perpendicular to the optical axis of the sensor light, the distance to each of a plurality of measurement points arranged horizontally at regular intervals along a line that runs on said pile of the powdery or granular material so as to face the movement path of the sensor. This step is performed every time the sensor is moved vertically a predetermined distance at a time. In each session of the step, a point is extracted that is closest to the sensor, and a function describing a straight line approximating the curve through all of the thus extracted points is determined by the least-squares method. Then, the angle of this straight line with respect to a horizontal plane is determined.
REFERENCES:
patent: 4041476 (1977-08-01), Swainson
patent: 4905512 (1990-03-01), Hayashi
patent: 5335547 (1994-08-01), Nakajima et al.
patent: 5377011 (1994-12-01), Koch
Hanakawa Tadami
Inoue Yoshiyuki
Sasabe Shuji
Takebayashi Kenji
Yokoyama Toyokazu
Buczinski Stephen C.
Hosokawa Micron Corporation
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