LUBRICANT DETERIORATION SENSOR AND OPTICAL SENSOR

摘要

One object is to provide a lubricant deterioration sensor that can maintain accuracy of sensing the deterioration of a lubricant having low transmissivity and an optical sensor used therein for sensing the amount of received light. The lubricant deterioration sensor is used for determining deterioration state of a lubricant. The lubricant deterioration sensor includes an optical sensor having: an LED for emitting detection light; an oil entering gap in which the detection light passes through a lubricant to be inspected; a color sensor for sensing color information of the detection light having passed through the lubricant; and a logarithmic amplifier for logarithmically amplifying the detection value sensed by the color sensor and outputting the amplified detection value.