Patent ID: 8704174
Filing Date: 2014-04-22
Classification: G01N

Abstract:
1. An oil degradation level measuring instrument to measure an oil degradation level of lubricant oil or insulating oil for one of an engine and a transformer comprising: an excitation light irradiation unit is controlled by a calculation device with a CPU configured to vary an intensity of excitation light to irradiate the excitation light on refined oil that is a measurement object; a fluorescence intensity detection unit is controlled by the CPU configured to detect an intensity of fluorescence that is generated in the refined oil irradiated with the excitation light; a time lag characteristic calculation unit is controlled by the CPU configured to calculate a time lag characteristic of a fluorescence intensity variation with respect to the intensity variation of the excitation light; a correlation storage unit preliminarily stores in a memory unit a correlation between a degradation index value indicating a degradation level of the refined oil and the time lag characteristic; and a degradation index value acquisition unit is controlled by the CPU configured to determine the correlation and to acquire the degradation index value from the memory unit based on the time lag characteristic calculated in the time lag characteristic calculation unit to determine the oil degradation level.