Nuctech Company Limited

Tsinghua University

Shuqiang Dong

Zhiqiang Chen

Yuanjing Li

Ziran Zhao

Yinong Liu

Qingjun Zhang

Yan Zheng

Shiping Cao

Xiang Zou

Jianping Chang

Yongqiang Wang

Shaoji Mao

Xianghua Li

Nan Yao

A boron-coated neutron detector, comprising a cathode tube with a plurality of passages formed therein along its longitudinal direction, the inner wall of each passage being coated with boron material; an electrode wire serving as an anode and arranged longitudinally in each of the passages, the electrode wire adapted to be applied with high voltage; and an insulating end plate to which each end of the cathode tube is fixed, the electrode wire being fixed to the cathode tube via the insulating end plate. Preferably, the cathode tube is formed by jointing a plurality of boron-coated substrates. The boron-coated neutron detector increases the detection efficiency of the neutron detector, which may reach or even exceed the detection efficiency of theHe neutron detector of the same size, and the cost thereof is much cheaper than theHe neutron detector.

Boron coated neutron detector and method for manufacturing the same

Embodiments of the present disclosure relate to substance detection technology, and to signal extraction circuits and methods for ion mobility tubes, and ion mobility detectors, which can solve the problem with the conventional technologies that it is difficult to design and manufacture the leadout circuit for the pulsed voltage on the Faraday plates. A signal extraction circuit for an ion mobility tube includes an DC-blocking module configured to remove a DC voltage contained in a voltage extracted, by a signal leadin terminal, from the Faraday plate, and to output, by a signal leadout terminal, a pulsed voltage contained in the voltage extracted from the Faraday plate. An ion mobility detector includes the signal extraction circuit for an ion mobility tube according to the present invention. A signal extraction method for an ion mobility tube includes extracting a voltage on a Faraday plate in the ion mobility tube, removing a DC voltage contained in the voltage extracted from the Faraday plate, and outputting a pulsed voltage contained in the voltage extracted from the Faraday plate. The present invention is used to extract a pulsed voltage from the Faraday plate.

Signal extraction circuits and methods for ion mobility tube, and ion mobility detectors

The present invention discloses an asymmetric field ion mobility spectrometer. It comprises an ionization source, for generating ions; an electrode plate; a plurality of electrode filaments, arranged in opposite to and spaced apart from the electrode plate by an analysis gap, wherein a high voltage of electrical field is applied between the electrode plate and the electrode filaments to form an ion migration area, the electrode filaments used to collect the ions that do not pass through the ion migration area; and a collection electrode, disposed at a rear end of the ion migration area, and collecting the ions that have passed through the ion migration area. The present asymmetric field ion mobility spectrometer is capable of improving accuracy of identifying peak positions of the ions, reducing scanning time of DC voltage and types of compensation voltage, thereby increasing ion detection efficiency.

Asymmetric field ion mobility spectrometer

The present invention provides a corona discharge device, comprising a first electrode including: a first substantially cylindrical inner chamber portion and a second substantially conical inner chamber portion in communication with the first inner chamber portion, wherein the second inner chamber portion has a cross sectional area that gradually enlarges in a direction away from the first inner chamber portion. The present invention also provides an ion mobility spectrometer comprising: an ionization region; and the corona discharge device disposed in the ionization region. With the above construction and structure, the ion mobility spectrometer of the present invention has the advantages that extraction of ions is facilitated and a life time of the corona electrode is lengthened. In addition, the focusing and storing electrode is used to effectively shield interference of a corona discharge pulse, and to push and focus sample ions. A designed voltage control solution is used to achieve mobility differentiating of ions, while a corona pulse is shielded to prevent variation in an ion quantity due to the corona pulse, thereby achieving an effect of stabilizing mobility spectrum lines.

Corona discharge device and ion mobility spectrometer having corona discharge device

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Beijing, China

Shuqiang Dong