GetCTE
Description :
This function allows to analyze a image series so as to retrieve the CCD (or CMOS) sensor absolute quantum efficiency (QE) versus wavelength.
This function needs a set of images, for each image important information is required into input tables such as reference photodiode flux, wavelength, and so on (see variable tables).
As result, this function outputs two plots, one is Quantum Efficiency versus wavelength, and the other is Photo Response Non Uniformity plot.
Warning this function as a lot of parameters, so please be carrefull and patient when using it.
Please have a look HERE to get important information about CCD testing functions.
Minimum version : 18/04/2002
Syntax :
GETQE ImageArray AmtImages BiasImg X1 Y1 X2 Y2 PixelSizeX PixelSizeY CvF CalDist MeaDist Bw Wl Flux refMea DebgMode [PhotonErr DiodeFluxErr Wtrans] Wal QE errQE PRNU Entropy
[are optionnal parameters]
Variables :
| Parameters | Inputs / Outputs | Type | Description |
| ImagesArray | Input | Array of image handler | An array of images handles (that points the the pixel datas) that needs to be previously loaded. |
| AmtImage | Input | Integer | Amount of images to analyze |
| BiasImg | Input | Image variable | Image variable that points to a MASTER bias made of at least 5 bias frames |
| X1 | Input | Integer | Left bottom X image coordinates where the statistic will be computed |
| Y1 | Input | Integer | Left bottom Y image coordinates where the statistic will be computed |
| X2 | Input | Integer | Top right X image coordinates where the statistic will be computed |
| Y2 | Input | Integer | Top right Y image coordinates where the statistic will be computed |
| PixelSizeX | Input | Floating point | X Pixel size as microns, overriden if read from the image file header |
| PixelSizeY | Input | Floating point | Y Pixel size as microns, overriden if read from the image file header |
| CvF | Input | Floating point | Conversion factor, expressed as electrons per ADUs |
| CalDist | Input | Floating point | Distance monochromator output - photodiode during calibration (mm) |
| MeaDist | Input | Floating point | Distance monochromator output - CCD surface during image recording (mm) |
| Bw | Input | Floating point | Bandwidth (nm) fixed for the whole image set. |
| Wl | Input | Array of floating point | Wavelength (nm) for each image |
| Flux | Input | Array of floating point | Photodiode flux for each image as amperes |
| refMea | Input | Array of floating point | Reference photodiode flux for this wavelength as amperes. |
| DebgMode | Input | Boolean | Debug mode, if =1 display more information |
| PhotonErr | Input | Array of floating point | Optional : mesurment error during image exposure as ADUs |
| DiodeFluxErr | Input | Array of floating point | Optional : photodiode error as amperes |
| Wtrans | Output | Array of floating point | Optional : optical window transmission (0 to 1) |
| Wal | Output | Array of floating point | Wavelength as nm |
| QE | Output | Array of floating point | Computed quantum efficiency as % |
| errQE | Output | Array of floating point | Quantum efficiency error as % |
| PRNU | Output | Array of floating point | Photoresponse non uniformity as % |
| Entropy | Output | Array of floating point | Entropy computation |
See also :
GETNOISE
GETLINEARITY
STAT
STATWINDOW
GETCONVERFACTOR
Example :
path$="C:\Prism\Images de test\ccd_test\QE\" // Loads files like 1.cpa ... each file is a different
wavelength X1=200 PixelSizeX=15 CvF=1.02 ............. GETQE ImageArray AmtImages BiasImg X1 Y1 X2 Y2 PixelSizeX PixelSizeY CvF CalDist MeaDist Bw Wl Flux refMea DebgMode Wal QE errQE PRNU Entropy .............
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