- This topic has 11 replies, 2 voices, and was last updated 6 years, 8 months ago by
NEETHU N.
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April 11, 2018 at 6:33 am #48456
NEETHU NParticipantHi all, I am simulating a distributed acoustic sensor in optisystem. For that, how can I produce vibration signal of purticular frequency?? Or is it possible using MATLAB?
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April 11, 2018 at 2:37 pm #48489
Mohamed A. A. AbouseifParticipantHi Neethu, as I answered a similar question, here is my answer.
I think you have to go to next step of the sensor.
I mean the vibrational signal will change what in the fiber??
let us say, it will change the loss level, so the output power will fluctuate according to the vibrational signal.
so you can design your system in such a way that, make the output power is dependent on a variable (global variable for example) representing the output power!
Hope that is clear to you and helpful,
thanks
Mohamed Abouseif -
April 12, 2018 at 1:27 am #48493NEETHU NParticipant
Ok sir.
So in which software I can do that? And also, can I make a relation between that variable and the vibration frequency I was intended to use?? -
April 12, 2018 at 7:46 am #48495Mohamed A. A. AbouseifParticipant
Neethu,
I mean OptiSystem.
you can define a global variable in the main window then relate it to the vibration frequency as you want.If that not clear, up load your project and let someone try to help,
Hope that is beneficial
Mohamed Abouseif
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April 13, 2018 at 2:27 am #48517NEETHU NParticipant
Sir, I attach here the osd file. It has a MATLAB component. So attaching its code also.
An LFM signal is created and mixed with laser light- thats what I did upto now. Actually the project is to send this light through fiber and analyse the
backscattered light after interaction with the vibration signal. -
April 16, 2018 at 11:27 am #48543Mohamed A. A. AbouseifParticipant
Hi Neethu,
I think you forgot to upload the .osd file!!Mohamed Abouseif
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April 18, 2018 at 2:58 am #48570NEETHU NParticipant
SIR ,PLEASE FIND THE ATTACHED
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April 18, 2018 at 9:23 am #48580Mohamed A. A. AbouseifParticipant
Hi Neethu,
I have gone through your project.
two points would make it running.
1. in the matlab file path, do NOT put the file name just put the PATH. as the file name is put in the above edit box.
2. the function you have used in matlab titled “chirp” , I did not see it in matlab. I am not sure what you want to do from this function. check if it is defined or you can rewrite another code to perform what you need.I have tried your program and it is working now. Just you need to rewrite the equivalent of the chirp function!!
Hope that helps,
Mohamed Abouseif -
April 19, 2018 at 2:22 am #48588NEETHU NParticipant
Sir, chirp function was found from the ‘mathworks’ web sight. I used it to create linear frequency modulated pulses. Is chirp function is different?
https://in.mathworks.com/help/signal/ref/chirp.html.But there is problems in the plots of signals. It is not like what we are expecting from the command. That is why I interchanged the two frequency values
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April 19, 2018 at 2:50 am #48590NEETHU NParticipant
Yes sir, its working eventhough the the graph(or optisystem visualizer) is not like what is expecting. And it is about the next step I don’t know what to do. ie, get a vibration signal and interact this modulated light with that.
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April 19, 2018 at 10:10 am #48593Mohamed A. A. AbouseifParticipant
good that it is working now.
I think what you need just to emulate the actual vibration effect to the one parameter such as the frequency chirp, or polarization effect …etc.
Hope that helps
Mohamed Abouseif -
April 22, 2018 at 2:39 am #48611NEETHU NParticipant
So, what can I do now.? ,to detect the backscattered light and to check the phase variation of the modulated light by the vbration?
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