Standoff Raman Semi-Collimated (SORSC) Instrument Evaluation: A Comparison to a Traditional Handheld Raman Instrument
Abstract
A non-lens-based, semi-collimated handheld Raman instrument was compared to a traditional lens-based, fixed-focal-length handheld Raman instrument. The semi-collimated handheld Raman instrument provided greater flexibility in distance requirements, as the area under the Raman curve of a polytetrafluoroethylene peak was greater when normalized and compared (as figures of merit) at all distances from 0 to 3 m. A decrease in Raman signal was found to be 1/d^1.3 (where d is distance), which is significantly improved from the traditional 1/d^2 distance dependence of signal loss. Angle dependence of the Raman signal captured from the instruments was found to be more sensitive for the semi-collimated handheld Raman instrument at 1 m but was comparable to traditional handheld systems at other distances. Finally, it is shown that simulated dissemination patterns could be printed on copy paper and used as surrogates to show how well a system could perform in overlapping and detecting a dispersed surface sample.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 16, 2023
- Accession Number
- AD1193460
Entities
People
- Eric R. Languirand