Finding frequency of a blinking light using vision builder

[b_v_v]

Hi all,

Can any one suggest me how to find the frequency of a blinking light using vision builder 

[SamiF]

What are the frequency and the duty cycle ?

Sami Fathallah

Opto France

[b_v_v]

Thanks for the reply sami

Total on and off time is 5 seconds and duty cycle is 50% 

But I need to calculate through time stamp is it possible to calculate?

And can I know how to store continous change of  pixel value of blinking light in array

Thanks in advance

[SamiF]

Blinking frequency is quite low and duty cycle balanced. So, except if you're looking for very high measurement accuracy, it shouldn't be too difficult to do so in Vision Builder. I can't provide you a ready made inspection but just the following advices :

• the camera frame rate should be your timebase and thus will define your period measurement accuracy
• reducing the image width and height to small values should enable you to increase the frame rate (if you are imaging the led light directly, you may have enough light to use short exposure time and not limit the frame rate by this parameter)
• setup the acquisition mode to "Every image" and use appropriate buffer number to make sure you will not skip any frame
• using average value in measure intensity step to evaluate if the led is on or off should do the job