OPTICAL SPECTROSCOPIC MEASUREMENT SYSTEM

摘要

A system capable of highly sensitive measurement of material concentration values in a sample using an optical spectroscopic method is disclosed. The system utilizes high-speed data acquisition and high resolution sampling of the raw signals output by the sensors with reduced total channel counts, and performs frequency analysis of the signals using the Fourier transform method to process all sensor channels in parallel. When each sensor is targeting the detection of some certain materials at some certain frequencies, the system is capable of simultaneous detection of multiple materials of interest in the sample with high measurement sensitivity and high speed.

主权项

1. A system for measuring material concentration values in a sample, comprising:
a plurality of laser sources modulated at different frequencies, each laser source emits light into the sample; a plurality of sensors to detect output signals from the sample; a signal combiner module to combine the output signals detected by the plurality of sensors into a combined signal; a data acquisition (DAQ) device to digitize the combined signal; a Fourier transform unit to perform a Fourier transform on the digitized signal to obtain signal intensity at each of the modulation frequencies in parallel; and a digital signal processor to calculate the material concentration values in the sample.