| 摘要 |
<p>Method and apparatus for measuring oil quality based on the permittivity of the oil comprising a capacitive or radiative sensor (22) for exposure to the oil, and an oscillator circuit including the sensor (22), characterised in that the oscillator circuit comprises an LC or crystal oscillator which provides an output signal, the amplitude of which is dependent upon the lossiness Tanδ of the oil, and measuring means that responds to be amplitude of said output signal as a measure of oil quality.</p> |
