哈达玛多路复用技术能有效改善离子迁移谱的信噪比,但在哈达玛还原谱中出现了假峰等 失真现象,严重影响了离子迁移谱(IMS)的检测性能。通过改变多路复用参数来观察哈达玛变换离子迁移谱 中的假峰变化情况,分析了各种多路复用参数与哈达玛变换离子迁移谱中假峰的关联性。实验结果表 明:多路复用参数的变化可能会改变假峰的位置或峰型,但无法从根本上消除哈达玛离子迁移谱的假峰现象。 结果进一步证明了哈达玛多路复用中固有的调制缺陷可能是哈达玛变换离子迁移谱中出现假峰的主要原因之一。

Hadamard multiplexing technology can effectively improve the signal-to-ratio of ion mobility spectrum, but the false peaks and other distorting phenomenon appear in Hadamard spectral, which has serious influence on the detection performance of ion mobility spectrometry(IMS). The changes of false peaks in Hadamard transform IMS are observed by changing the multiplexing parameters, and relationship between the multiplexing parameters and false peaks are analyzed. Experimental results show that variations of multiplexing parameters can change false peak position or peak profile, but they can not eliminate fundamentally false peak phenomenon of Hadamard IMS. Results further prove that the inherent defects in Hadamard multiplexinged modulation may be one of the main causes appearing the false peaks in Hadamard transform IMS.