Instructions Insert your telescope parameters (focal length, aperture both in mm). To calculate the pixel size from your camera system (that includes the camera in question) use these equations that are proven and work: Pixel EFLlambda/ (QD) EFL is the effective focal. Detector Specification sheets /spectroscopy Resolution calculator /calculators Andor HoloSpec On-axis high throughput imaging spectrograph 5 HoloSpec F/1.8i- ideal for Raman applications Dimensions L x W x H mm inches 440 x 190 x 170 17.3 x 7.5 x 6.7 Weight kg lbs 8. Where S dc and S ro are camera dark current and read out noise values, respectively. Calculator uses the following equation to calculate signal-to-noise ratio (SNR): From this equation we get an expression for exposure time: where S dc and S ro are camera dark current and read out noise values, respectively. This astronomy webtool helps to calculate a variety of parameters, such as field of view (FOV), image scale, minimum pixel size (to avoid oversampling) and sensor diagonal based on different telescope and Andor camera combinations. CalculationsĬalculator uses the following equation to calculate signal-to-noise ratio (SNR):įrom this equation we get an expression for exposure time: When using custom CCD, to get the best results enter quantum efficiency of the CCD at the wavelength that corresponds to the mean wavelength of a filter that is going to be used. When using custom telescope, telescope effective area can be omitted, in which case a default value of 100% will be used. Pop-up window will appear asking for custom instrument parameters. In order to do that, choose 'Custom' option from the dropdown menu. The atmosphere transmission coefficient should also be calculated independently of the calculator and entered in the 'Sky transparency' field.Ĭalculator can also be used with some custom instruments and options, and not only those listed in the dropdown menus. Total throughput over all reflective and refractive optical surfaces in the telescope along with the transmission of the chosen filter should be calculated separately and entered in the 'Total transparency' field. Andors Zyla sCMOS camera platform offers high speed, high sensitivity and high resolution imaging and spectroscopy performance. In the form, instruments currently available at the AS Vidojevica can be chosen.
If, for the given parameters, exposure time is calculated to be less than 0.01s, calculator will not show any result and the graph will not be drawn.
By filling up the form and clicking on the 'Calculate' button, exposure time needed in order to achive wanted signal-to-noise ratio (S/N) is calculated. This calculator is made primarily for planning observations at the Astronomical Station Vidojevica (Astronomical Observatory of Belgrade).