1、http:/Performance and sensitivity of Low Resolution Spectrographs for LAMOSTZhu Yongtian, Hou Yonghui, Hu ZhongwenWang Lei, Wang JianingSan Diego, 27 June, 2010http:/Outline Brief introduction-LAMOST-LRSs Test results- Image quality- Throughout-Wavelength coverage and resolution Some results in earl
2、y commissioning observationhttp:/LAMOSThttp:/Specification of LAMOSTEffective aperture: D = 4mFocal ratio: F#= 5field of view : 5 degrees Number of Fibers : 4000FRD: f/5f/4Fiber core diameter: 320micons or 3.3http:/Specification ofLow Resolution SpectrographThere are 16 LRS spectrographs250 fibers f
3、or each spectrographWavelength coverage 370nm900nmResolution expected 100010000http:/The optical layout of the LAMOST-LRSR1000/2000R5000/10000R5000/10000R1000/2000Blue band(370590nm)Red band (570900nm)Yongtian Zhu, Zhongwen Hu, Qingfeng Zhang, et al. Proc. SPIE 6269(2006)http:/Spectrograph Parameter
4、s 16 low resolution spectrographs (LRSs) for LAMOST 250 fibers(3.3 arcsecs) / Each spectrograph The fibers are separated by 578m center to center along the 144 mm height arc slit F/4 Schmidt collimator A dichroic beam-splitter 4 VPH gratings/LRS (low, and medium dispersion respectively) 2 articulating red and blue F/1.3 Schmidt cameras field lens Corrector mirrors 40964136 EEV CCD 12m square pixel sizehttp:/In laboratoryin Xinglong Stationhttp:/VPH Grating sets of LAMOST-LRShttp:/VPHG
