US 12,352,726 B2
Trace detection device
Qingjun Zhang, Beijing (CN); Yuanjing Li, Beijing (CN); Zhiqiang Chen, Beijing (CN); Jianmin Li, Beijing (CN); Weiping Zhu, Beijing (CN); Qiufeng Ma, Beijing (CN); Biao Cao, Beijing (CN); Lili Yan, Beijing (CN); Ge Li, Beijing (CN); and Nei Yang, Beijing (CN)
Assigned to Nuctech Company Limited, Beijing (CN); and Tsinghua University, Beijing (CN)
Appl. No. 17/999,201
Filed by Nuctech Company Limited, Beijing (CN); and Tsinghua University, Beijing (CN)
PCT Filed May 14, 2021, PCT No. PCT/CN2021/093720
§ 371(c)(1), (2) Date Nov. 17, 2022,
PCT Pub. No. WO2021/233210, PCT Pub. Date Nov. 25, 2021.
Claims priority of application No. 202010416806.4 (CN), filed on May 18, 2020.
Prior Publication US 2023/0236150 A1, Jul. 27, 2023
Int. Cl. G01N 27/622 (2021.01); G01N 30/20 (2006.01); G01N 30/02 (2006.01)
CPC G01N 27/622 (2013.01) [G01N 30/20 (2013.01); G01N 2030/025 (2013.01); G01N 2030/201 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A trace detection device, comprising:
an ion mobility tube configured to detect a sample;
a sampling gas path module configured to collect the sample;
a sample injection gas path module configured to introduce a sample carrier gas containing the sample collected by the sampling gas path module toward the ion mobility tube; and
a gas chromatography apparatus capable of pre-separating the sample carrier gas, so as to form a pre-separated sample carrier gas;
wherein the sample injection gas path module is further configured to be capable of switching between a first mode and a second mode, wherein in the first mode, the sample injection gas path module introduces the sample carrier gas into the ion mobility tube; and in the second mode, the sample injection gas path module introduces the sample carrier gas into the gas chromatography apparatus to pre-separate the sample carrier gas, wherein the pre-separated sample carrier gas is introduced into the ion mobility tube,
wherein the sample injection gas path module comprises a main sample injection gas path module as well as a first branch sample injection gas path module and a second branch sample injection gas path module in parallel connection, the first branch sample injection gas path module and the second branch sample injection gas path module in parallel connection are connected with the main sample injection gas path module in series, and the gas chromatography apparatus is disposed on the second branch sample injection gas path module; and
wherein the trace detection device further comprises a first three-way valve, a first port of the first three-way valve is in fluid communication with the main sample injection gas path module, a second port of the first three-way valve is in fluid communication with the first branch sample injection gas path module, a third port of the first three-way valve is in fluid communication with the second branch sample injection gas path module, and the first three-way valve is configured to only allow the sample carrier gas to flow from the main sample injection gas path module to the first branch sample injection gas path module in the first mode, and only allow the sample carrier gas to flow from the main sample injection gas path module to the second branch sample injection gas path module in the second mode.