Recent content by watertreader

Technically, I am trying to find M only. I am just wondering if my technique has any other drawbacks or whether would it be sufficient 1) Using FFT method essentially separate the A and M. A is in the DC while M or rather M/2 is sited with the modulated signal frequency 2) Using the...

hi, Just want to have some comments on the AM Demodulation steps that I have taken. A AM modulated signal is given by AM(t) = DC + m cos(wt) For the general demodulation technique, I understand there is two general form - (i) Synchronous Detection whereby you mix the input wave with an...

so if we take an approximation to a0, even if we made a small change to x, we will still obtain a straight line or a constant Would this suggest that at small x, the function itself is not a function of x? thanks

just another query...if we have done a Maclaurin expansion on an equation ...the result is a0 + a2x^2 + a3 x^3 +... does it still qualify to say that the equation is still linear? since the only terms in the expansion up to x terms are only a0 thankls

in general, how do we show linear relationship over a small x of the equation? Is the equation being able to be Taylor expand show itself as linear? likewise can we consider the series expansion at about x=0 (maclaurin series) to be linear too? If not, is there any examples countering...

actually i am interested to know about intereference between scattered photons, are they able to interfere...is there any written books or journal on them? thanks

Hi, For interference to take place, the light wave must retain their coherence. For scattering, when photon particles are scattered/dispersed/deflected, they should lose their phase relationship or coherence, should they be capable of interference? this may sound queer, i know interference...

hi, I am thinking of mode as in the mode in fiber...specifically toying around the idea of a two mode fiber

Hi, If I have two different light modes focused onto a single spot, could they interfere? Thanks

Guess you will also need some basic optical design books from Laikin, Kingslake Also About Practical Computer-Aided Lens Design by Gregory Hallock Smith is almost a must if you are using Zemax

not a homework assignment... actually i am more concerned with the timing detection requirement of differential detection... for a heterodyne detection, we need to capture 2 cycle of change to determine the heterodyne signal..what about differential? also for homodyne and heterodyne...

Hi, Just a query... what is the differences between this types of detection and their usage? a) heterodyne b) differential c) normal d) homodyne?

hi, How do we differentiate between quasi elastic scattering and non elastic scattering? Was told that dynamic light scattering falls under the quasi elastic scattering... but it seems to me that light undergoing such scattering have its frequency shifted... this seems to me to be that...

Not too sure if this is the right place to post... any good optics discussion forum that one could go to? any recommendation? Thanks

No, I didn't. Have another one PMT(other model) in an even smaller box... seem to be working well for me... BTW, out of interest... to monitor temperature in a box... what circuit did you used? A thermostat?