Unable to use zSaveDetector

[shbhuk]

Hi,
I am trying to use zSaveDetector which gives me error code -2. I am using a Rectangular detector in NSC mode. Post running a ray trace using zNSCTrace I use the zSaveDetector command

ln = pyz.createLink()
ln.zGetRefresh()
zmxfile = os.path.split(ln.zGetFile())[1]
ln.zNSCTrace(1,0,timeout=5000)
ln.zSaveDetector(1,36,location+'sample.ddr')

[shbhuk]

I get the code 0 (successful) when I give the filename as just 'sample.ddr'. However it is still not in the Lens file folder.

Else, is it possible to directly save the detector as a txt file?

[shbhuk]

I also tried using zGetDetectorViewer, it saves a txt file, however gives an AttributeError: NoneType object has no attribute group.

Further if I want to specify which detector file to be saved, how should I go about that?

[indranilsinharoy]

@shbhuk. Hi, I'm sorry for replying late. I just don't have any bandwidth to look into this before the coming weekend. I'll work on it then. Thanks for reporting. Regards, Indranil.

[shbhuk]

Alright. Look forward to hear from you.

Thanks.

[indranilsinharoy]

Hi @shbhuk ,

I think there is a problem with your location string. Are you using double backslashes or single backslashes in your directory path? The reason I suspect that is because the function seems to work in my test. This is what I did:

First, I loaded the sample file Interference Example 2- A Mach-Zehnder Interferometer.ZMX from ...\Documents\ZEMAX\Samples\Non-sequential\Coherence Interference and Diffraction into Zemax NSC mode. Then, I traced the rays and saved the detector from the Jupyter QtConsole:

ln = pyz.createLink(1)
zmxfile = ln.zGetFile()
ln.zNSCTrace(surfNum=1, srcNum=0, split=1, usePolar=1)
import os
filename = os.path.join(os.path.split(zmxfile)[0], 'sample.DDR')
ln.zSaveDetector(surfNum=1, objNum=9, fileName=filename)
ln.close()

Note that I the function ln.zSaveDetector() returned 0.

Following ray tracing, when I do:

os.listdir(os.path.split(zmxfile)[0])

I see the following output (note the sample.DDR file in the end):

['Interference Example 1- A Simple Interferometer.SES',
 'Interference Example 1- A Simple Interferometer.ZDA',
 'Interference Example 1- A Simple Interferometer.ZMX',
 'Interference Example 2- A Mach-Zehnder Interferometer.SES',
 'Interference Example 2- A Mach-Zehnder Interferometer.ZDA',
 'Interference Example 2- A Mach-Zehnder Interferometer.ZMX',
 'Interference Example 3- Coherence Length Reduces Fringe Visibility.SES',
 'Interference Example 3- Coherence Length Reduces Fringe Visibility.ZDA',
 'Interference Example 3- Coherence Length Reduces Fringe Visibility.ZMX',
 'Interference Example 4- Diffraction Limited Imaging.SES',
 'Interference Example 4- Diffraction Limited Imaging.ZDA',
 'Interference Example 4- Diffraction Limited Imaging.ZMX',
 'sample.DDR']

Please let me know if you could resolve your problem. I will close the issue after that.
Thank you, and sorry for keeping you waiting.

[indranilsinharoy]

Also, the answer to your second question (I get the code 0 (successful) when I give the filename as just 'sample.ddr'. However it is still not in the Lens file folder.) is that Zemax seems to save the file in the current working directory where the Python interpreter is running. Although, I haven't tested all possibilities, in my case, I had launched Jupyter QtConsole from C:\Users\Indranil\Documents (checked using pwd in QtConsole), and Zemax saved the file---using the name Zemaxsample.DDR---in that directory.

[shbhuk]

Hi,
As far as saving it as*.ddrfile is concerned, you are right about it being related to the location string.
Generally since I need to interface with Linux often I try to use single forward slashes. I get this error when I use I them. I do get the error for single back-slashes as well.

I get the 0 output (ddr file) when I use double backslash, or use os.path.join as you have mentioned in your example.

[shbhuk]

Now that I can obtain a DDR file, is it possible to obtain a detector specific text file? As mentioned above , when I use - zGetDetectorViewer I get a text file from the first detector in the object list (by default), is there any way to change that. If not, I guess I could insert a temporary detector as the first object (perhaps) and insert the sample ddr file and then save it as a text file (for further analysis). Let me know if there is a simpler method.

The last query that I have is -zGetDetectorViewer does save it as a txt file, however gives an -

AttributeError: 'NoneType' object has no attribute 'group'.

Thus none of the parameters are returned, ie. dvwInfo.

The full traceback for the error is -

zobj.ln.zGetDetectorViewer(txtFile=location+'Sample.txt')

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-22-d98f40e2f16a> in <module>()
----> 1 zobj.ln.zGetDetectorViewer(txtFile=location+'Sample.txt')

c:\users\shbhu\appdata\local\enthought\canopy\user\lib\site-packages\pyzdde-2.0.3-py2.7.egg\pyzdde\zdde.pyc in zGetDetectorViewer(self, settingsFile, displayData, txtFile, keepFile, timeout)
   9395 
   9396         pyz = _sys.modules[__name__]
-> 9397         ret = _zfu.readDetectorViewerTextFile(pyz, textFileName, displayData)
   9398 
   9399         if not keepFile:

c:\users\shbhu\appdata\local\enthought\canopy\user\lib\site-packages\pyzdde-2.0.3-py2.7.egg\pyzdde\zfileutils.pyc in readDetectorViewerTextFile(pyz, textFileName, displayData)
    668     if peakIrrLineNum:
    669         peakIrr = float(pyz._re.search(r'\d{1,4}\.\d{3,8}[Ee][-\+]\d{3}', 
--> 670                                        line_list[peakIrrLineNum]).group())
    671         totPow = float(pyz._re.search(r'\d{1,4}\.\d{3,8}[Ee][-\+]\d{3}', 
    672                                       line_list[peakIrrLineNum + 1]).group())

AttributeError: 'NoneType' object has no attribute 'group' 

P.S.: This time the location is with two double backslashes. I am not sure why is peakIrrLineNum empty.

[indranilsinharoy]

@shbhuk

I get a text file from the first detector in the object list (by default), is there any way to change that.

Use the function zSetDetectorViewerSettings() or zModifyDetectorViewerSettings() to change the detector number, and other relevant parameters.

I think that setting the parameters using zSetDetectorViewerSettings() should also solve your other problem. Here is what I did in my local machine, and I can see both the text file output and an image:

In [1]: import os
In [2]: ln = pyz.createLink(1)
In [4]: zmxfile = ln.zGetFile()
In [5]: ln.zNSCTrace(surfNum=1, srcNum=0, split=1, usePolar=1)
Out[5]: 0
...
In [10]: cfgfile = ln.zSetDetectorViewerSettings(settingsFile=None, surfNum=1, detectNum=9, showAs=0, smooth=1, dType=1)
...
In [12]: # txtfilename = os.path.join(os.path.split(zmxfile)[0], 'sample.txt')
...
In [16]: txtfile = 'C:\\Users\\indranil\\sample.txt'
...
In [22]: dvwInfo, dvwData = ln.zGetDetectorViewer(settingsFile=cfgfile, displayData=True, txtFile=txtfile, keepFile=True)
In [23]: dvwInfo
Out[23]: dvwInfo(surfNum=1, detNum=9, width=5.0, height=5.0, xPix=500, yPix=500, totHits=300000, peakIrr=9.082, totPow=0.40687, smooth=1, dType='Coherent Irradiance', x=0.0, y=23.25, z=96.5, tiltX=0.0, tiltY=0.0, tiltZ=0.0, posUnits='Millimeters', units='Watts/cm^2', rowOrCol=None, rowColNum=None, rowColVal=None)
In [24]: plt.imshow(dvwData)
Out[24]: <matplotlib.image.AxesImage at 0x1a1064d9198>
In [25]: plt.show()

Along with the image, the text file was also available in the right place.

Note that in In [16]: I used a text file location where you don't need any special privilege to write. If you get an error like AssertionError: zGetTextFile returned -1, it most likely is because Zemax / PyZDDE was unable to dump the text file in the desired directory. For example, in my case, the line In [12]: didn't quite work.

Hope that helps.
Regards, Indranil.

[shbhuk]

Hey thanks for the SetDetectorViewerSettings bit. However this problem still persists.
I believe the pyz._getFirstLineOfInterest(line_list, 'Peak\sIrradiance') is returning a None value which is basically causing this error.

Do you know in which cases does it do so? The source code (zdde.py line 12202) says that if does not find a matching pattern it returns None

[indranilsinharoy]

I think that there is a mismatch between what data type you are asking Zemax to compute/dump to the text file and what the zGetDetectorViewer() expects. Can you make sure that you are using the correct dType setting in zSetDetectorViewerSettings() function? Also, check in the text file dumped by the function and see if a line starting with "Peak Irradiance" is present or not.
It is possible that there could be a bug. Can you please reproduce your problem with the Zemax supplied sample file Interference Example 2- A Mach-Zehnder Interferometer.ZMX and send me your code? (I'm reopening the issue for now).

[shbhuk]

Hi,
So I am now using the sample file you mentioned above.
The code is as follows -

import os
import pyzdde.zdde as pyz


ln = pyz.createLink()
ln.zGetRefresh()
zmxfile = os.path.split(ln.zGetFile())[1]
ln.zNSCTrace(surfNum=1, srcNum=0, split=1, usePolar=1)


cfgfile = ln.zSetDetectorViewerSettings(settingsFile=None, surfNum=1, detectNum=9, showAs=0, smooth=1, dType=1)
filename = os.path.join(os.path.split(zmxfile)[0], 'sample.DDR')
txtfile="C:\\Users\\shbhu\\Box Sync\\Seq to NS\\Zeroref_global\\sample.txt"
dvwInfo, dvwData = ln.zGetDetectorViewer(settingsFile=cfgfile, displayData=True, txtFile=txtfile, keepFile=True)

Here I tried dType 0 and 1 and they give the same AttributeError as mentioned above. However dType = 2 (coherent phase) does not give an error.'