公开(公告)号：US20250137921A1

公开(公告)日：2025-05-01

申请号：US18385806

申请日：2023-10-31

Applicant: Picarro, Inc.

Inventor： Chris W. Rella ,  Andrea Biasioli ,  Craig M. Haupt ,  Kai M. Skog ,  John A. Hoffnagle

IPC: G01N21/27 ,  G01J3/42 ,  G01N21/3504

Abstract: Improved correction of optical absorption spectroscopy results for trace gas detection is provided by correcting for species crosstalk (and other environmental effects) on a per-frequency basis. Analyte concentrations are then determined by curve fitting to the corrected absorption spectrum. This is in marked contrast to the conventional approach of first performing a curve fit to determine analyte concentrations, then correcting the analyte concentrations to account for species crosstalk and other environmental effects. In some embodiments, the number of parameters for the per-frequency corrections are automatically determined from the data (e.g., using a LASSO regression).

公开(公告)号：US20250027856A1

公开(公告)日：2025-01-23

申请号：US18225012

申请日：2023-07-21

Applicant: Picarro, Inc.

Inventor： Kai M. Skog ,  James M. Hamilton ,  Chris W. Rella ,  Bruce A. Richman ,  Elizabeth R. Schemm ,  Rebecca Wernis

IPC: G01N1/40 ,  G01N1/44 ,  G01N21/31

Abstract: Improved gas sample preprocessing is provided for scanning optical spectroscopic analysis instruments by tailoring characteristic gas handling times to the scan time Ts of the analysis instrument. In particular, for sample preconcentration, the desorption duration Td of the sample preconcentrator should be ≥2Ts. For gas chromatography, the elution duration Te of relevant eluted species should be ≥2Ts. This advantageously avoids having significant changes in the gas sample within the analysis instrument as a scan is being performed.