How long does it take to acquire a Raman spectral image?

The acquisition time for a Raman spectral image depends on many parameters, including the size of the image area, the number of pixels (data points) required, and the acquisition time per pixel (which is itself dependent on the Raman intensity of the sample’s components, and the spectral quality required). Typical Raman spectral images can contain hundreds, thousands or even millions of Raman spectra, so acquisition times can be significant.

A Raman spectral image can be acquired in any time scale from a few seconds through to several days, depending on the above requirements.

Traditional Raman spectral imaging has always been limited by relatively long acquisition times, but such methods do offer the ultimate sensitivity for materials with extremely low Raman scattering properties, and additionally allows high resolution, large spectral range measurements.  Typical acquisition times for such maps can be in the order of 1s-10s per point (or longer), resulting in total measurement times in the order of hours or days.

The development of ultra-fast Raman spectral imaging modules allows drastically reduced measurement times with acquisition times down to <5ms/point.  Such speeds mean that large area survey scans and detailed Raman spectral images can be completed in seconds or minutes!

SWIFT ultra-fast Raman spectral image of pharmaceutical tablet - 6,601 spectra - 52s total acquisition
SWIFT™ ultra-fast Raman spectral image of pharmaceutical tablet - 6,601 spectra - 52s total acquisition
Raman Spectral Image
SWIFT™ ultra-fast Raman spectral image of 0.9 µm polystyrene beads on quartz - 38,763 spectra - 3m:28s total acquisition
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