| 摘要 |
The present invention relates to a sensor for detecting the degree of deterioration of oil, and more particularly, provides an oil deterioration sensor which can detect the deterioration of oil and/or the liquid surface of oil by utilizing the fact that the sound velocity of ultrasonic waves change according to the alkalinity of the oil, the oil deterioration sensor for determining deterioration characteristics of oil by utilizing ultrasonic waves, which is characterized in that a deterioration sensor reflecting surface for reflecting ultrasonic waves transmitted from an ultrasonic wave transmitting portion is placed in oil so as to detect deterioration of the oil, and characterized by comprising: an oil deterioration detecting portion for evaluating a transmission velocity of an ultrasonic wave in the oil by receiving ultrasonic waves from the aforesaid deterioration sensor reflecting surface and for evaluating a degree of deterioration of oil from said transmission velocity of the oil.
|
