DETECTION METHOD OF IN-LIQUID FOREIGN MATTER

• Main Authors: KAMATA MASAKATSU, SUDA YOSHIFUMI, OHARA ATSUSHI, ICHIKAWA JUN
• Format: Patent
• Language: English
• Published: 27.11.2002
• Edition: 7
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a detection method of in-liquid foreign matter capable of detecting only the foreign matter by distinguishing between bubbles in the liquid and the foreign matter. SOLUTION: Optically transparent liquid 2 injected into an optically transparent syringe 1 is irradiated with light emitted from an illuminator 4 though a red filter 8, and the liquid 2 is imaged by a camera 5 installed on the position opposite to the illuminator 4 across the syringe 1, and binary image data acquired by binarization of an original image data of the liquid 2 outputted from the camera 5 into '1' having the brightness not less than a prescribed threshold and '0' having the brightness less than the threshold are generated by an image processing means 5. The camera 5 has a function for throttling the incident light quantity, and throttling of the incident light quantity and the illuminance of the illuminator 4 are set so that a connected component of the '0' level larger than a prescribed size does not appear in the binary image data corresponding to the bubbles 10 in the liquid.