Ultraviolet Stand-off Raman Measurements Using a Gated Spatial Heterodyne Raman Spectrometer
| Autor: | Nirmal Lamsal, Tayro E. Acosta, S. Michael Angel, Shiv K. Sharma |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Heterodyne
02 engineering and technology medicine.disease_cause 01 natural sciences law.invention Telescope symbols.namesake Optics law medicine Physics::Atomic Physics Coherent anti-Stokes Raman spectroscopy Instrumentation Spectroscopy Spectrometer business.industry Chemistry 010401 analytical chemistry 021001 nanoscience & nanotechnology Laser 0104 chemical sciences Interferometry symbols 0210 nano-technology business Raman spectroscopy Ultraviolet |
| Zdroj: | Applied spectroscopy. 70(4) |
| ISSN: | 1943-3530 |
| Popis: | A spatial heterodyne Raman spectrometer (SHRS) is evaluated for stand-off Raman measurements in ambient light conditions using both ultraviolet (UV) and visible pulsed lasers with a gated ICCD detector. The wide acceptance angle of the SHRS simplifies optical coupling of the spectrometer to the telescope and does not require precise laser focusing or positioning of the laser on the sample. If the laser beam wanders or loses focus on the sample, as long as it is in the field of view of the SHRS, the Raman signal will still be collected. The SHRS is not overly susceptible to vibrations, and a vibration isolated optical table was not necessary for these measurements. The system performance was assessed by measuring stand-off UV and visible Raman spectra of a wide variety of materials at distances up to 18 m, using 266 nm and 532 nm pulsed lasers, with 12.4 in. and 3.8 in. aperture telescopes, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|