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Old 1st September 2005, 07:08 PM   #11
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My dissertation work involved the use of B&K 4003s to measure infrared spectra.
How do you measure heat waves with a microphone? Infrasound would be more to the liking of those mics. We hung some 4006's in the chimney of a factory to measure the spectra for sound control. Didn't last long... And don't try to measure at -50C with B&K stuff, the preamps have a heater that put out enough heat for a room (well, out measuring chamber anyway). Had to disconnect that. First class stuff that B&K gear.
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Old 1st September 2005, 07:34 PM   #12
SY is offline SY  United States
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It's actually a pretty nifty technique. You modulate the incident light, then the material surface alternately heats and cools, causing the boundary layer of air (or other gas) to expand and contract. That produces sound.

The advantage is that you can get absorption spectra from "difficult" samples, things that are tough to measure via transmission or reflection.

The B&K mikes are wonderful. Not that I would have ever stooped so low as to commandeer them when I wanted to record something...
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Old 4th September 2005, 10:27 PM   #13
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Originally posted by SY


My dissertation work involved the use of B&K 4003s to measure infrared spectra. For some reason or other, those mikes never seemd to be around unless I was physically in the lab.

Why was the Navy doing ESR?
It had to do with super-conductivity of copper-gold alloys, the Navy had a research institute which farmed out projects. Working in physics research convinced me that there were more fun things to do in life.
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Old 7th August 2012, 05:02 AM   #14
RNMarsh is offline RNMarsh  United States
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Originally Posted by Nightvision View Post
People,

I want to build a sor of amplifier which can make 0 to 1200V output out of 0 to 5V input (may also be inverted).

It has to be a lineair control. It also has to be in SMD. Many transistors or FETs can't go further than Vce and Vbe of 200/300V, so I have to make something which can handle the 1200V.

Anyone has an idea?! Thanks!

Martijn
You might search for electrostatic headphone amplifer circuits. Cant use smd at high voltage.
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Old 8th September 2012, 06:58 PM   #15
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I do not know what about the SMD-mounted amplifier, but in such an amplifier circuit for 1500 - 2000 watts I have. It is only necessary to take good kandensatory on the power supply and very powerful diode bridges. I think that the power amplifier does not make sense to make a pulsed power supply due to strong fluctuations at maximum capacity. This amplifier ripple current at full power for about 10 - 15 amps. With such a supply voltage and currents of these seems to me that the surface mount assembly, it is not realistic at least.
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