Recent content by trojsi

What do you think of these types of UV diffraction gratings? http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1122 Where can I find them cheaper? thanks

I will go for diffraction. What type of diffraction do you think is best for one photodiode? I will try to design the optical stage to get the best signal to noise ratio from the photodiode to get the best measurements. Regarding the photodiode, i will either use one sensitive to uv or else...

Hi, I am working on my thesis which is going to be uv instrumentation using photodiodes. I had in mind to extract the UV from the whole solar spectrum at sea level. I know that the UV band is narrow compared to visible and IR. I also wish to experiment with the various components like...

I cannot assume this. The system has to remain non linear that is why it will be simulated via simulink. Dont worry, I will not be working any calc with a non linear system. Do you mean y-y_{o} ? Then how would the differential equation be?

Homework Statement I have the following difference equation; y[n] -1.7y[n-1] -0.72y[n-2]=x[n] with aux conditions; y[-1]=1, y[-2]=-2 input; x[n] = (0.7)^{n}u[n] I used the recursive method to get 5 consecutive values of the impulse response of the system and also 5 consecutive values of...

I need to investigate some tight control on an open loop modelling of a servo motor linked with a spring mass damper system. The linkage with spring mass damper is stable with a counterbalance on the other side. The aim is to shift the mass (by the servo) of the s-m-d system and eliminate...

From this mechanical part (attached), I need to derive a differential equation relating mass 'x' position to hinge 'y' position. \ddot{x}m + b\dot{x} + cx = F The link l would be rotating. I am confused about considering the displacement of x with reference to y. Would this change the...

You were right on the square root, I will correct it. Please find attached what I have tried so far. There are about 2 full A3, but I wrote down what I thought makes sense. thanks any help

I am asked to derive a formula from the diagram attached. I should end up with this equation: f=1/2\pi (k/(M+I/R^2)) I tried really hard relating linear quantities with rotational (T=Fr, T=I*alpha etc.) ones but it was all in vain. Any help would be really appreciated. thanks

Yeah, youre right, I was mistaken, torque is not a force, sry. Any Clues please?

the thing is that I need to derive an equation to the one given and explain the steps involved, I will try to upload a more clear copy of the question.

Hi folks, In a tutorial I was given this problem on which I've been trying to solve these last 2 day with non luck. The Problem is attached with a diagram. I tried to take the torque as being T=mg-mR\alpha^{2} but it was all in vein. Any help would be much appreciated Thanks...

thanks for telling.. I uploaded it now :)

Hi, please find attached the problem and the answer. I can't anderstand the first and second step of the answer. I only need a link for the topic or maybe method the used. Bdw I haven't tried to figure out the second answer but for now I only need help tackling the first one.

Hi, please find attached the problem and the short and sweet Answer. I can't understand the last step of the answer.