In order to further improve the detection sensitivity of corrosive sulfides in transformer oil

the correlation detection theory is introduced to the Raman spectroscopy quantitative analysis for the first time

a multi-channel signal modified correlation detection method is proposed

and all methods are mathematically proved. Taking dibenzyl disulfide

a typical corrosive sulfides molecule in transformer oil

as an example

we use the traditional quantitative analysis method and find that the limit of detection is 338.51 mg/kg. After the correlation detection is introduced

the limit of detection reaches 178.29 mg/kg

an increase of 1.90 times is achieved. After applying the multi-channel signal modified correlation detection method

the detection sensitivity for weak signals is further enhanced as the channels number increases. When the channels number reaches 25

the detection rate of 19.5 mg/kg dibenzyl disulfide samples can reach 100%. Finally

the reliability and effectiveness is demonstrated by fixed concentration samples test. These methods can also be generalized to chromatography

mass spectrometry and other spectra based detection methods.