| 摘要 |
<p>PURPOSE:To allow the accurate measurement of the yellowish color forming material in a lubricating oil so that the total acid value in the lubricating oil can be exactly known by mixing a specified volume of the oil and a specified volume of a polar org. solvent and settling the particle component in the lubricating oil. CONSTITUTION:After the lubricating oil is sealed in a sample cell 2, a light source 11 is turned on. The light from the light source 11 is collimated to collimated beams of light and the sample is irradiated with these beams. The beams transmit the sample and the attenuation and absorption of the light take place during this time. The transmitted light arrives at an inclined mirror 12. This light is switched and projected to interference filters 14, 15 by rotation of the inclined mirror 12. The part of 5 to 6mum wavelength of the light from the light source 11 is absorbed by the particle components while this slight transmits the sample. The light of 7.7 to 9.1mum wavelength is absorbed by the org. acid and sulfur oxide in the sample. The output of a sensor 19 is, therefore, changed by the particle quantity in the sample and the output of a sensor 20 is changed by the quantity of the org. acid and sulfur oxide in the sample. The insoluble component quantity in the sample is, thereupon, estimated by the detection output of the sensor 19 and the total acid value is obtd. from the difference between the detection outputs of the sensors 19, 20.</p> |
