OIL DETERIORATION DETECTOR

摘要

PURPOSE:To enable continuous and quantitative detection of oil deterioration, by forming a microwave resonance hollow while microwave is transmitted to a box body for passage of oil through or holding thereof in to check deterioration in oil from the behavior of a signal received. CONSTITUTION:Both openings of a box body 1 is connected to an oil piping P and provided with a porous plate 2 in which through pores 21 are formed to allow oil to pass freely. The diameter of the through pores 21 shall be large enough to block the passage of microwaves for use in detection and the box body 1 acts as a resonance hollow thereof. A transmitting antenna 3a is provided on the side wall of the box body 1 to transmit microwaves into the box body 1 and a receiving antenna 3b to receive them facing each other while the antenna 3a is connected to a microwave oscillator 4 and the antenna 3b to a microwave detector 5 respectively. The oscillation controlling circuit 6 controls the oscillator 4 so as to oscillate microwaves with a continuously varying frequency repeatedly. A signal processing circuit 7 can detect deterioration in oil from variations in the resonance frequency of the microwave received.