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ISAAC LW Exposure Time Calculator

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Infrared Long Wavelength Imaging Mode Version 3.2.1
Description.
F.A.Q
Performance

    Input Flux Distribution


 Uniform (constant with wavelength)
 Blackbody: Temperature:  Kelvin

Object Magnitude: 

 Single line
	Wavelength:  nm
	Flux:        10-16 ergs/s/cm2 (per arcsec2 for extended sources)
	FWHM:        nm 

Magnitudes are given per square arcsec for extended sources.

Spatial Distribution: Point Source Extended Source

    Sky Conditions

Airmass 
Seeing   arcsec

    Instrument Setup

LWI4 (objective L3) WB Filter: For LWI4: Select chopping below.
NB Filter:
LWI3 (objective L2) WB Filter: For LWI3: Select non-chopping and specify a DIT below.
NB Filter:


    Results

S/N ratio: Plotting range: %

The total exposure time, for non-chopping mode, is the product of DIT (Detector Integration Time) and NDIT (number of DITs). This exposure time does not take into account instrument and telecope overheads.

Exposure Time settings: Chopping Mode Total Exposure Time: min.
Non-Chopping Mode DIT: sec (minimum DIT is 0.0032) NDIT:
Plotting range: %

On submission the model can generate the following graphs:
(input parameters are replicated in the output page)


 Detector Illumination
 S/N as a function of Exposure Time
 Total Efficiency
 S/N as a function of seeing (only for point-source)
 Input spectrum in physical units

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