Methods and devices for optically determining a characteristic of a substance

摘要

Optical computing devices are disclosed. One exemplary optical computing device includes an electromagnetic radiation source configured to optically interact with a sample and first and second integrated computational elements arranged in primary and reference channels, respectively. The first and second integrated computational elements produce first and second modified electromagnetic radiations, and a detector is arranged to receive the first and second modified electromagnetic radiations and generate an output signal corresponding to the characteristic of the sample.

主权项

1. A method of determining a characteristic of a sample, comprising:
optically interacting an electromagnetic radiation source with the sample and a first integrated computational element arranged within a primary channel 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 and second modified electromagnetic radiations with a first detector; and generating an output signal with the first detector, the output signal corresponding to the characteristic of the sample, wherein the first integrated computational element is selected according to a first spectral response associated with the characteristic of the sample, and the second integrated computational element is selected according to a second spectral response associated with the same characteristic of the sample, thereby increasing a sensitivity of the output signal.