Instrument
System efficiency
PFS system efficiency was measured with calibration standard stars in the engineering observations. The result is plotted in the figure above. The system efficiency here includes throughput of the telescope primary mirror, WFC, fiber systems, and spectrograph optics, and detector QE. Note that the fiber aperture effect, i.e., the fraction of light covered by fiber aperture, and the vignetting effects on FoV at the prime focus of the telescope and on the SpS detectors are not included.
Typical system efficiencies in each arm are shown in the table below.
| blue (@500nm) | red (@800nm) | med. res. (@800nm) | NIR (@1100nm) | |
|---|---|---|---|---|
| Observed | ~18% | ~26% | ~25% | ~19% |