Devices for optically determining a characteristic of a substance

摘要

Optica l computing devices are d isclosed. One exemplary optica l computing device (300) includes an electromagnetic radiation source (201) configured to optica lly interact with a sample (202) and first and second integrated computational elements (302, 304) arranged in primary (Al) and reference channels (A2), respectively, the first and second computationa l elements (302, 304) are configured to be either positively or negatively correlated to the characteristic of the sample (202). The first and second integrated computational elements (302, 304) produce first and second modified electromagnetic radiations (306, 308), and a detector (212, 216, 220) is arranged to receive the first and second modified electromagnetic radiations (306, 308) and generate an output signa l correspond ing to the characteristic of the sample (202).