•   Beam Spot Size
•   Signal-to-Noise Ratios
•   Test Cases
 
 
  

Signal-to-Noise Ratios

The figures below show the benefits that can be gained by using a synchrotron light source versus a traditional glower source for infrared spectroscopy measurements.

Signal-to-noise between globar and SR light

Figure 1: Calculated flux from synchrotron port (01B1-1). Synchrotron parameters: 2.9 GeV, 172 mA. Globar parameters: T=1470 K, 1 mm2 source point, same acceptance as beamline port.

Comparison of brightness of synchrotron to globar

Figure 2: Comparison of brightness from synchrotron port (01B1-1) and globar source. Synchrotron parameters: 2.9 GeV, 172 mA. Globar parameters: T=1470 K, 1 mm2 source point, same acceptance as beamline port.

Signal-to-noise between globar and SR light for pinhole sizes

Figure 3: Ratio of noise levels between synchrotron (SR) and globar light sources for various pinhole sizes.

Peak-to-Peak RMS noise in 100% trace

Figure 4: Peak-toPeak and RMS noise present in 100% transmission traces for various pinhole sizes.

Noise levels of synchrotron radiation compared to a globar source

Figure 5: Comparison of noise levels for synchrotron light (black) and globar (red) with 100% traces using a 3 μm pinhole (smaller than the diffraction limited light spot) and 170 mA current in the storage ring. The choice of spectral range highlights the region where the globar is the brightest. The recording was performed with optimal globar alignment. Even under such conditions, the performance with synchrotron light is still much better.