Ultrasonic waves through pressure

[vinniewryan]

If you had an ultrasonic transmitter and receiver mounted within a pressurized container, what would happen to the wave signal as the pressure is changed within the container? I understand it's all just air moving, but would there be any obvious change to the ultrasonic wave as the air pressure is varied?

 

[sophiecentaur]

To a first appropximation, the speed of sound in a gas is not dependent of the pressure - just on the temperature. But if you increase the pressure then this could increase the temperature. This would increase the speed (and increase the wavelength) so you might expect some refraction effects. It would depend on the actual set up.

 

[vinniewryan]

The basic set up would be to emit an ultrasonic wave through a balloon with a receiver on the other side (or the same side), and based on the observed alteration in the received wave form, phase shift, amplitude, rise and fall edges, etc, be able to determine the pressure within the balloon. Temprature is too iffy for this experiment to be successful unfortunately, although if I had a temprature sensor monitoring the ambient temprature outside of the balloon and use the ultrasound to estimate the temp within the balloon within a certain accuracy, maybe it's an option, but I could see balloon size/volume of air having some sort of unreliable effect on that method. Thoughts?

 

[pallidin]

Are we dealing here with an ultrasonic "shock wave", or one that is oscillating?
Please clarify.

 

[vinniewryan]

It would be an oscillating ultrasonic wave. Also, if the air within the balloon is a different temperature than the air outside of the balloon, how would this effect the result? Is the pressure of gas relative to temperature?

 

[JeremyGilbert]

It does not matter which method you choose whether it is the use of the professional services, trapping or the more traditional method the fact is these pests can do damage to our property and homes or businesses. When you invest in your home and properties, you do not want an unwanted pest to move in, help themselves to your walls, foundations, and cause damage that will cost your more money.

 

[sophiecentaur]

It does not matter which method you choose whether it is the use of the professional services, trapping or the more traditional method the fact is these pests can do damage to our property and homes or businesses. When you invest in your home and properties, you do not want an unwanted pest to move in, help themselves to your walls, foundations, and cause damage that will cost your more money.

I can't make this fit into the subject in question. is it in the right place?