Photoacoustics of Small Gas Clouds
Thread Rating:
  • 5 Vote(s) - 3 Average
  • 1
  • 2
  • 3
  • 4
  • 5
mechanical wiki
Active In SP

Posts: 150
Joined: Sep 2009
03-09-2009, 10:58 PM

Photoacoustics of Small Gas Clouds

The photoacoustic effect - production of sound from light - may be exploited for detection and localization of gas leaks on the surface of otherwise sealed components. The technique involves filling the test component with a photoactive tracer gas, and irradiating the component to produce photoacoustic sound from any leak site where a tracer gas cloud forms. This presentation describes experiments utilizing 10.6-micron radiation from a carbon-dioxide laser with sulfur hexafluoride as a tracer gas. Here, photoacoustic sounds from a laminar plume of sulfur hexafluoride and several NIST-traceable calibrated leak sources with leak rates between 1 cubic centimeter in 4.6 hrs and 1cubic centimeter in 6.3 years were recorded with four or twelve microphones in a bandwidth from 3 kHz to ~100 kHz. The measured photoacoustic waveforms compare well with those from an approximate theoretical development based on the forced wave equation when the unmeasured size of the photoactive gas cloud is adjusted within the likely gas-cloud diffusion zone. However, for small gas clouds, the photoacoustic sound amplitudes predicted by the approximate theory fall far below the experimental observations and several potential reasons for this mismatch will be offered. Interestingly, the higher measured signal amplitudes imply that the sensitivity of photoacoustic leak testing may reach or even exceed the capabilities of the most sensitive commercial leak test systems based on helium mass-spectrometers
Use Search at wisely To Get Information About Project Topic and Seminar ideas with report/source code along pdf and ppt presenaion

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Gas metal arc welding seminar tips 9 4,825 23-10-2013, 09:47 PM
Last Post: sydaimran
  Small Gasoline Engines PPT seminar projects maker 0 413 19-09-2013, 04:57 PM
Last Post: seminar projects maker
  SEMINAR ON REVIEW OF SMALL SATELLITES PPT study tips 0 325 24-08-2013, 03:54 PM
Last Post: study tips
Bug Bio-Gas As Alternative Fuel In IC Engines Computer Science Clay 11 12,474 19-07-2013, 05:44 PM
Last Post: Guest
  GAS WELDING ppt study tips 0 618 19-07-2013, 04:33 PM
Last Post: study tips
  Gas Insulated Switchgear (GIS) pdf study tips 0 348 29-06-2013, 03:23 PM
Last Post: study tips
  SEMINAR ON EXHAUST GAS RECIRCULATION study tips 0 461 27-05-2013, 01:06 PM
Last Post: study tips
  REPORT ON GAS KIT FOR TWO WHEELER study tips 0 623 22-05-2013, 04:58 PM
Last Post: study tips
  Development and test of a new catalytic converter for natural gas fuelled engine pdf study tips 0 516 19-02-2013, 09:31 AM
Last Post: study tips
  Study Gas Metal Arc Welding Process and Microstructural Analysis of Mild Steel pdf study tips 0 518 16-02-2013, 09:28 AM
Last Post: study tips