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    • 11. 发明专利
    • APPARATUS FOR INSPECTING CONTAMINATION DEGREE OF HYDRAULIC OIL
    • JPH05180766A
    • 1993-07-23
    • JP35936591
    • 1991-12-27
    • TOYOTA CENTRAL RES & DEVAICHI STEEL WORKS LTD
    • KATO TAKAYUKIMORIBE TATSUOSAKAE TAKASHIIWAI MITSUAKI
    • G01N21/59G01N27/02G01N33/26
    • PURPOSE:To judge the contamination degree of oil to be inspected by applying high frequency voltage across electrodes to measure electric impedance and measuring light transmissivity by a light emitter and a photodetector and inputting these measured values to a microprocessor to compositely judge the contamination degree of the oil to be inspected. CONSTITUTION:When an inspection container 1 filled with a water-soluble hydraulic oil 6 to be inspected is at the optimum measuring temp., high frequency voltage is applied across electrodes 5, 6 by conductive contacts 11, 12. The electric impedance change due to the oxidative deterioration of the oil, the reduction of additives or the reduction of moisture is detected as the amplitude change of high frequency voltage appearing across both terminals of a load condenser 25 and this voltage value is compared with the reference value being the measured value of new oil to be judged. At the same time, the light transmissivity of the oil 6 is measured by a light emitter 15 and a photodetector 16 arranged in opposed relationship and compared with the reference value being the measured value of an empty container to judge the contamination degree of the oil 6. Next, the contamination degree of the oil 6 is compositely judged on the basis of the algorithm and judge standard preliminarily stored in a microprocessor 32 to be displayed by a display 33 and an OK lamp 34.
    • 13. 发明专利
    • DUST DETECTOR
    • JPH0477650A
    • 1992-03-11
    • JP19207890
    • 1990-07-20
    • TOYOTA CENTRAL RES & DEVTOYOTA MOTOR CORPAMANO CORP
    • KATO TAKAYUKIITO YOZOFUKAMI SHOJIOTA TAKASHI
    • G01N21/59
    • PURPOSE:To enable continuous measurement of dust in an exhaust within an exhaust duct with a high accuracy and in a highly stable manner by extracting components varying beyond a specified value in a microscopic time unit of a signal according to the quantity of light transmitted to be integrated over a specified time and then, to be compared with a specified value. CONSTITUTION:Light beam irradiated from a light emitter 10 is made to irradiate a light emitter 12 passing through a dust path 20 of a container 18 and a photocurrent is outputted. When a large amount of dust passes continuously through the dust path 20 caused by breakage of filter or the like, an output signal of a photo detector 12 changes rapidly in a microscopic time unit and the amplitude of the change is large. In this case, a signal level to be outputted from a rectifier circuit 65 via a differentiation circuit 64 always becomes large than a reference value e1 and the signal level to be outputted from an integration circuit 68 is also larger than a reference value e2. Abnormality is determined with a judging circuit 69 to be shown on a display means 70. This enables continuous measurement of dust with a high accuracy and in a highly stable manner in the exhaust within an exaust duct thereby achieving detection of abnormality of a dust condition.