Observational techniques meeting #8. Filter systems.

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Presentation transcript:

Observational techniques meeting #8

Filter systems

Johnson system

SDSS system (Gunn filters)

IR filters

Narrow-band filters

More… >215 systems …

Spectrographs

Dispersive elements: prism High throughput; low resolution; wavelength-dependant dispersion R=t dn/dλ

Dispersive elements: diffraction grating R = m L k

Dispersive elements:grism

Dispersive elements: reflection grating

Cross-dispersed echelle

Slitless spectroscopy

Spectrograph

Multiplexing Multislit masks Fiber spectrographs

LAMOST m mirror 4000 fibers 16 spectrographs Xinglong station

End

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