# Research on a Small Oil Detection Instrument Combining Micro-Distillation Range Analyzer and Raman Spectroscopy Technology

## TL;DR

This paper introduces a compact oil detection system combining micro-distillation and Raman spectroscopy for rapid and accurate diesel oil quality assessment.

## Contribution

The novel integration of micro-distillation and Raman spectroscopy enables compact, high-sensitivity oil quality analysis.

## Key findings

- The system effectively detects diesel oil quality with smooth data and clear Raman characteristic bands.
- Fluorescence interference is mainly observed in heavy oil components, affecting Raman signal quality.
- Data fitting methods like Savitzy–Golay and PLS ensure reliable and comparable results across different oil samples.

## Abstract

In order to achieve rapid detection of oil quality, an innovative small-scale oil joint detection system is designed in this paper. The joint detection system combines a micro-distillation instrument and Raman spectrometer module through a combination module. The basic principle is to use a Raman spectrometer to detect the distillate in the micro-distillation instrument in order to predict the properties of the oil and determine its quality. The system uses Savitzy–Golay smoothing, baseline correction, normalization processing, partial least squares, and other methods for data fitting to ensure the authenticity and comparability of the measured data. Fourteen different sources and grades of diesel oil are selected in this paper for pre-experiments to verify the data fitting effect. Two oil samples, No. 1−10# diesel oil 1 with strong fluorescence interference and No. 2−10# diesel oil 2 with weak fluorescence interference, were used as test objects to compare the Raman spectra of undistilled oil and distilled oil, verify the testing effect of the joint detection system, and analyze the mechanism of fluorescence interference mainly existing in the heavy components of the oil. The test results show that the joint detection system can quickly detect the quality of different grades of diesel oil, with good smoothness, obvious characteristic bands, and good data fitting. The joint detection system designed in this paper has the advantages of high sensitivity, high integration, and small size, laying the foundation for research related to distillation ranges combined with Raman spectroscopy technology.