Methods and devices for optically determining a characteristic of a substance

摘要

Using an optical computing device includes optically interacting electromagnetic radiation with a sample and a first integrated computational element arranged within a primary channel, optically interacting the electromagnetic radiation with the sample and a second integrated computational element arranged within a reference channel, producing first and second modified electromagnetic radiations from the first and second integrated computational elements, respectively, receiving the first modified electromagnetic radiation with a first detector, and receiving the second modified electromagnetic radiation with a second detector, generating a first output signal with the first detector and a second output signal with the second detector, and computationally combining the first and second output signals with a signal processor to determine the characteristic of interest of the sample.

主权项

1. A method of determining a desired characteristic of a sample, comprising:
optically interacting electromagnetic radiation with the sample and a first integrated computational element arranged within a primary channel; optically interacting the electromagnetic radiation with the sample and a second integrated computational element arranged within a reference channel, wherein the first integrated computational element is selected according to a spectral response associated or disassociated with the desired characteristic of the sample, and the second integrated computational element is selected according to a spectral response associated or disassociated with the desired characteristic of the sample, wherein the spectral response disassociated with the desired characteristic of the sample is a regression vector associated with a second characteristic of the sample different from the desired characteristic of the sample; producing first and second modified electromagnetic radiations from the first and second integrated computational elements, respectively; receiving the first modified electromagnetic radiation with a first detector, and receiving the second modified electromagnetic radiation with a second detector; generating a first output signal with the first detector and a second output signal with the second detector; and computationally combining the first and second output signals with a signal processor to determine the desired characteristic of the sample.