A new method of measuring liquid concentration of Carbofuran was introduced which taking porous silicon Bragg reflectors (PSBR) fabricated as the sensor with pulsed etching method, and the theory of measuring pesticide concentration by using PSBR was stated, and the measurement system was presented. The reflected spectra of PSBR and those of PSBR in the different Carbofuran solution were obtained by experiments,and the relationship between Carbofuran concentration and reflected peak of PSBR was researched. The results show that the reflected peak of PSBR can be led to a red shift when PSBR is dipped in different Carbofuran solution, and the red shift has a linear relationship with Carbofuran concentration in 0-0.1 mg/L range. It is leasible to carry out the quantitative analysis of the concerned pesticide by PS.%利用脉冲腐蚀法制备了多孔硅Bragg反射镜,分析了反射镜测量农药浓度的原理,搭建了多孔硅反射谱测量系统,实验研究了多孔硅反射镜的光谱图、在不同浓度克百威溶液条件下的多孔硅光谱图以及克百威浓度与多孔硅反射谱峰位变化的关系.结果表明,多孔硅反射镜在不同浓度的克百威溶液下,反射谱峰位将发生红移变化;当克百威浓度在0～0.1 mg/L时,峰位红移量与克百威浓度成线性关系.
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