Near-Infrared Spectroscopy Signal Extraction and Processing Design

Abstract:

This paper introduces the MSP430 MCU-based near-infrared spectrometer front-end signal extraction and software signal processing design.The system adopts phase locked loop technology to signal phase shift processing. Phase sensitive filtering function achieved by the balance modem AD630.Finally the analog signal is converted to digital signal by AD7715 for the microprocessor processed.Microprocessor receives digital signal, filter processing is performed using a first order lag filter method to determine the point of measurement value.Through the comparison analysis of the experimental testing result, the program has higher signal-to-noise ratio and suppress interference ability, high reliability, good stability,etc.

• Periodical: Applied Mechanics and Materials (Volume 404)
• Pages: 555-559
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.404.555
• Online since: September 2013
• Authors: Ke Zhao, Jian Hua Jiang, Jun Fang Fu, Jin Bo Xu
• Keywords: First Order Lag Filter, Near Infrared Spectroscopy (NIRS), Phase Locked Loop Amplification

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