Summary: At the Amistad Dam site an investigation was made with a 56 electrode STING/Swift system to determine the location of leaks which have effectively drained the giant dam of water. As it was not immediately obvious which array type would return the best data three different arrays were recorded on the same electrode layout. The resulting three 2D profiles show both similarities and differences. The conclusion is that dipole-dipole and Schlumberger are good choices for lateral structures whereas Wenner gives high resolution near the surface but also 'noisy' data towards increasing depths. Wenner seems to have a strong signal/noise ratio but averages fine information and thus smooths the picture. Schlumberger seems to be a good compromise, good detail with lateral resolution and good signal/noise ratio resulting in good depth penetration.
ProblemTwo large gas turbines (approximately 25m x 12m x 10m) were installed in an industrial area nearby an office building. The gas turbines generate a tonal noise component at around 2700Hz caused by the inlet channel blades pass frequency. This tone imposes a more stringent noise requirement on the supplier, forcing noise reducing actions being made on the turbine.Measurements and noise source identification with traditional methods (i.e. Sound Intensity with probe) is impossible, partly because of the gas...
One of thethings that we often talk about when we’re running our CPTC (Cirrus Product Training Courses) is how our hearing works and we often end up talking about how, if there’s no ambient sound, we can feel uncomfortable and can become disoriented very quickly.
One of the best (or maybe the worst) places to experience this is in an anechoic chamber and during my time atthe University of Salford we used the anechoic chamber for testing and evaluating hearing protection as well as subjecting each...
Why was the Amistad dam emptying—and what could be done to solve the problem?
In 1996, the Comision Federal de Electricidad (CFE), the national electric company of Mexico responsible for the Mexican half of the Amistad Dam, contacted AGI. The CFE heard about the capabilities of our instruments to look into the ground, and they were anxious to see if our tools could help them solve their problem: The dam was emptying itself, and thus, failing at flood control, power generation, and recreational use.
Backgro...
ProblemA newly built office complex is designed with glass facades between the offices and the hallway. The glass facades include a glass door. Although the glass structures themselves have a sufficient sound reduction value, the sound insulation between office and hallway was measured at 19 dB, which was far below the sound insulation criteria for offices given in the regulations. It was therefore important to find out where any weaknesses were introduced in the overall structure.MeasurementsA common way to...
Do you have questions about your noise measurement instruments that Google or Wikipedia just can’t seem to answer? Ask The Noise Doctor. I’m here to answer your most frequently asked questions. Whether it’s product or application based, I’m up to the challenge. In this article I’ll be covering battery life in the Optimus Sound Level Meter range.
A Commonly Asked Question
How long will the batteries last in my Optimus sound level meter?
Let’s start by saying that the...
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