pistonphone
So, I never get to take pictures of any of the things I build because cameras are not allowed in the laboratory where I work. Cause I'm giving a presentation soon though, I hauled the equipment outside, and took some shots.
This is my home-made infrasonic pistonphone, for all your 0.2 - 20 Hz calibration needs. Lots of time spent in the machine shop for this one. Don't stick your finger in it.
posted by tmm at
1:44 PM
2 Comments:
Thanks. In more clarity, a motor spins, which (depending on the gearing configuration and voltage of the power supply) will pump a piston in and out of the white tube at a particular number of rotations per second. It simultaneously cranks a potentiometer so I can get an amplitude and phase reference. The piston pumping in and out of the tube changes the pressure in the tube.
The point is, I can get the piston to pump in and out of the tube anywhere between 0.02 and 20 Hz, which allows me to see exactly how sensitive a microphone is at any frequency inbetween these values. Really good for measuring sonic booms, and infrasonic noise.
Rad.
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