Bipolar Hadamard conversion ionic migration spectrometer
An ion mobility spectrometer and ion mobility spectrometry technology, which is applied in the field of analytical instruments and detection, can solve problems such as analysis and detection interference, reduce the signal-to-noise ratio of ion mobility spectrometry, and improve signal background noise, so as to improve ion signal strength and signal Noise ratio, ion signal strength and signal-to-noise ratio are high, and the effect of improving analysis and recognition ability
Active Publication Date: 2017-12-26
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0003] However, in the Hadamard transform ion mobility spectrometry technique, due to factors such as modulation defects, there are a large number of false peaks in the Hadamard transform ion mobility spectrogram. These false peaks increase the background noise of the signal and reduce the ion mobility spectrum. The signal-to-noise ratio; in addition, the existence of false peaks also brings interference to the analysis and detection of substances
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[0021] The present invention is further described below by taking the Hadamard transform ion gate control module generating a 255-bit periodic digital sequence and air corona discharge ion mobility spectrum negative ion detection as examples.
[0022] like figure 1 As shown, the present invention is a bipolar Hadamard transformation ion mobility spectrometer, comprising an ion transfer tube 1 , a bipolar Hadamard transformation ion gate control module 2 and a signal analysis and processing unit 3 . The ion transfer tube 1 is composed of an ionization source 4 , a reaction zone 5 , an ion gate 6 , an ion transfer zone 7 and a signal detector 8 . The difference from the traditional ion mobility spectrometer is that the bipolar Hadamard transform ion gate control module 2 first generates a 255-bit forward Hadamard transform gated digital sequence. 0 represents closing the ion gate, 1 represents opening the ion gate; then the digital sequence is converted into a forward pulse vol...
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The invention relates to a bipolar Hadamard conversion ionic migration spectrometer. The bipolar Hadamard conversion ionic migration spectrometer includes an ion migration tube composed of an ionization source, a reaction zone, an ionic migration zone, an ion gate and a signal detector; a bipolar Hadamard conversion ion gate control module composed of a forward Hadamard conversion control module and a backward Hadamard conversion control module; a signal analysis and data processing unit used for collection of Hadamard conversion ion migration spectrum signals, restoration of superposition spectrums and arithmetical operation. The bipolar Hadamard conversion ion gate control module is connected with the ion gate, generates a forward Hadamard conversion gate control digital sequence and a backward Hadamard conversion gate control digital sequence in sequence, converts the sequences to voltage signals and connects th voltage signals to two ends of the ion gate. The opening and closing of the ion gate are controlled and forward / backward Hadamard conversion ion migration spectrums are obtained. Then through combination of arithmetical operation, the bipolar Hadamard conversion ion migration spectrum is obtained. According to the invention, false peaks in a traditional Hadamard conversion ion migration spectrum can be eliminated or weakened, ion signal strength and signal to noise ratio of the Hadamard conversion ion migration spectrum are increased, and the analysis and identification capability of the Hadamard conversion ion migration spectrum is improved.
Description
technical field [0001] The invention belongs to the field of analytical instruments and detection, in particular to a bipolar Hadamard transformation ion mobility spectrometer. Background technique [0002] Signal-to-noise ratio is one of the core parameters of ion mobility spectroscopy. Improving the signal-to-noise ratio of the ion mobility spectrum can effectively reduce the detection limit of the ion mobility spectrum and improve the analysis and detection capability of the ion mobility spectrum. In 2006, scientists applied Hadamard transform technology to ion mobility spectrometry for the first time, and developed a new Hadamard transform ion mobility spectrometry technology. This technology uses the Hadamard transform control module to generate a forward periodic digital sequence for controlling the ion gate of ion mobility spectrometry. It can be turned on and off to improve the use efficiency of ions, and finally the signal-to-noise ratio of the ion mobility spectru...
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IPC IPC(8): H01J49/02H01J49/26
Inventor 黄超群洪炎夏磊沈成银储焰南江海河
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI