关键词: 信息处理技术, 信号检测, 乙醇汽油分析, 主成分分析, 数字相敏检波

Abstract: In order to acquire the accurate signal from the noisy surrounding and get the relevant information about the gasohol from a lot of complex spectrogram which are made up of signals with a series of wavelengths, a compact, energysaving portable near infrared analyzer was designed to determine the content of water and ethanol in gasohol. The weak signal acquisition under the strong noise interference was solved by the digital phasesensitive detection technique, and an analysis model was built by means of the principal component analysis and Mahal distance, etc. The parameters of the model were calibrated by the comparative experiments and the standard data and the validation of the proposed signal acquisition technique was achieved.

Key words: information processing, signal detection, gasohol analysis, principal component analysis, digital phasesensitive detection