Recent content by bhartish

Yes I am in lab and I have used 750W peak power laser . I have specification sheet. But I don know peak power per pulse. I have actually used three parameters in my experiment : Laser power (in terms of duty cycle), pulse frequency and scanning speed.

Yes I have average power = 300W, beam spot diameter = 0.37mm, I am using Co2 laser Now can we find?

I have pulse frequency as 2.5kHz. How to calculate laser pulse duration at FWHM (full width half maximum)

T(z,t) = ∫ ( exp(-αz)* erfc(-α*sqrt((k*t)/(c*ρ))+0.5 sqrt((c*ρ*z)/(k*t)))*exp( -((t-ζ)/ζ0)^2) integrate with respect to ζ in the limits 0 and t Help will be greatly appreciated

I am solving a temperature distribution problem related to laser drilling. In the equation I am encountering a term called ' Absorption or extinction coeffcient' of alumina. Can anybody tell how to find this ?

urgent reply needed Can we use partial means as a predictor for the response while fitting a regression line or curve?.

I have laser hole (1mm-2mm dia) drilled specimens . How to measure heat affected zone ?

Yes fine I am using Tool makers microscope. But I want to know , for an irregular hole , how many measurements would be appreciable?.

I am actually looking into the instruments which I can use.

"Lenox Laser does this kind of work. You may wish to have them perform an analysis using their metrology equipment. Otherwise, some scopes with precision stages will tell you down to about +/- 5 millionths of an inch." Can I get some elaboration on this ?

"what diameter hole and to what accuracy do you wish to measure? i have been selling Metrology Instruments since 1980 and can provide some small input to your requirement" its approximately 2mm. I am checking for the repeatability of the experiment. But the shape is irregular.

I have laser drilled hole thin ceramic specimens and I am required to measure the diameter of the holes. Suggest me some methods.

I will clear one doubt. rt is r*t only. rt is definitely not a single variable. I have one doubt can't we take some fictitous value and start integration of error function and exponential ?

I will get back to you sir.

I have all the values of a, b, c, r, q, l and t. Then how to go about it ?