Optics: measuring and testing – By inspection with agitation or rotation – Of container contents
Patent
1988-02-04
1990-02-20
McGraw, Vincent P.
Optics: measuring and testing
By inspection with agitation or rotation
Of container contents
250223B, 356240, G01N 2189, G01N 2190
Patent
active
049021370
ABSTRACT:
A method is proposed for detecting foreign bodies in fluids to investigate the fluids such as infusion liquids for foreign bodies which can lead to the plugging of infusion needles or other dangers for a patient. In the method light is directed onto the fluid and the light departing from this fluid is detected. The fluid is illuminated evenly with polarized light, and the light penetrating through the fluid is further dimmed by further polarization. The light intensity of individual measuring regions is measured through photo-electric sensing and the measured intensity is compared with an adjustable threshold so that when the threshold is exceeded at any given time during a measuring interval, corresponding signals are produced.
REFERENCES:
patent: 3963348 (1976-06-01), Nakatani et al.
patent: 4050824 (1977-09-01), Woodrow et al.
patent: 4274745 (1981-06-01), Takahashi et al.
patent: 4547067 (1985-10-01), Watanabe
Barth Gerhard
Krieg Gunther
Reiser Manfred
Vaas Eberhard
Harro Hofliger Verpackungsmasghinen GmbH
McGraw Vincent P.
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