公开(公告)号：US10718716B2

公开(公告)日：2020-07-21

申请号：US16421888

申请日：2019-05-24

Applicant: THERMO SCIENTIFIC PORTABLE ANALYTICAL INSTRUMENTS INC.

Inventor： Peidong Wang ,  Rong Sun ,  Brendan Falvey ,  Haowen Li ,  Yu Shen ,  Michael E. Dugas

IPC: G01N21/71 ,  G01J3/02 ,  G01J3/10 ,  G01J3/443

Abstract: An embodiment of a laser induced breakdown system is described that comprises a portable device that includes: a laser configured to produce a beam comprising a plurality of repeating pulses; a processor configured to open a data acquisition window after a delay period, wherein the delay period begins upon production of one of the pulses; one or more optical elements configured to direct the beam at a sample and collect emitted light from a plasma continuum; and an optical detector configured to produce a plurality of signal values from the emitted light from the plasma continuum collected during the data acquisition window, wherein the processor is configured to identify an element from the signal values.

公开(公告)号：US10001443B2

公开(公告)日：2018-06-19

申请号：US14996725

申请日：2016-01-15

Applicant: Thermo Scientific Portable Analytical Instruments Inc.

Inventor： Craig Morris Gardner ,  Michael Derek Hargreaves ,  Peidong Wang ,  Yu Shen

IPC: G01J3/44 ,  G01N21/65 ,  G01N21/94 ,  G01N33/94 ,  G01N21/84 ,  G01N21/64

CPC classification number: G01N21/658 ,  G01J3/44 ,  G01N21/65 ,  G01N21/8483 ,  G01N21/94 ,  G01N33/9486 ,  G01N2021/646 ,  G01N2021/656 ,  G01N2201/0221 ,  G01N2201/06113

Abstract: A method of identifying the presence of heroin in an impure heroin composition which contains heroin and at least one fluorescent contaminant which interferes with a Raman signal from the heroin. The method may include contacting the mixture with a solvent such as an alcohol, then contacting the resulting alcohol composition with a SERS surface. The surface may then be exposed to laser light from a hand-held Raman spectrometer to detect a Raman signal from the heroin. An apparatus for performing the method is also provided.