Optics: measuring and testing – Oil testing
Patent
1988-02-25
1990-02-06
McGraw, Vincent P.
Optics: measuring and testing
Oil testing
250573, 331 66, 356436, 356442, G01N 3328, G01N 2159
Patent
active
048984620
ABSTRACT:
A device for detecting a transmissivity of a substance utilizing a transmitted light value, which comprises a light emitting element and a photo detecting element. The light emitting element and the photo detecting element are spaced from each other at a predetermined distance so that a transmitted light value of a substance passing through the space is detected as an amount of light transmitted therethrough. The photo detecting element further comprises a photo oscillator circuit including the photo detecting element as one component thereof and outputs a signal having characteristics selected from a cycle and a frequency corresponding to the transmitted light value, and when the condition of a substance exceeds a predetermined reference level, such information is displayed at a display unit. Further, the device carries out a detecting and discriminating operation when a temperature of a substance is at a level lower than a maximum temperature at which each component of the detecting circuit will not work effectively.
The device is also provided with a detecting unit in which the light emitting element and the photo detecting element are kept firmly in contact with each other, with a spacer placed therebetween, by an external force caused by a spring, to make the space provided therebetween constant regardless of any deformation of any component of the device caused by heat or aging.
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patent: 1480391 (1924-01-01), Hausser
patent: 3334309 (1967-08-01), Murphy et al.
patent: 3671751 (1972-06-01), Kortge et al.
patent: 3933046 (1976-01-01), Ebrecht
patent: 4003661 (1977-01-01), Yamano
patent: 4622465 (1986-11-01), Harig et al.
patent: 4699509 (1987-10-01), Kamiya et al.
patent: 4725148 (1988-02-01), Endo et al.
English Abstract of Japan 61-44413 published 3/1986.
English Abstract of Japan 60-105962 published 6/1985.
Partial English translation of Japan UM (Unexamined) 61-57842.
Akado Hajime
Asakura Fumio
Kago Yoshiyuki
Kato Hideharu
Nozawa Masaei
McGraw Vincent P.
Nippon Soken Inc.
Nippondenso Co. Ltd.
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