Prosig Noise & Vibration Measurement Blog » microphone

Comparison Between Sound Intensity Probes and Acoustic Cameras

James Wren — Mon, 15 Mar 2010 12:58:37 +0000

Sometimes we are asked about the differences between an acoustic camera and a sound intensity probe and which of the two is better for a particular application. There is no straightforward answer as they are quite different pieces of equipment, used for measuring different things. An acoustic camera is a tool used to locate and analyse [...]

What is the difference between microphone types?

James Wren — Tue, 19 Jan 2010 09:43:17 +0000

I’m often asked what is the difference between free field microphones, diffuse field microphones and pressure microphones.

For a run-of-the-mill ½ inch microphone the short answer is nothing.

However the long answer is a bit more involved.

Basically if the sample rate is 10 kHz or below and an accuracy of ±2dB is acceptable then there is no real [...]

Sound Steering

Dr Colin Mercer — Wed, 12 Sep 2007 09:54:20 +0000

The requirement was to develop a ‘standard’ test for assessing the sound quality of power steering pumps in vehicles. Measurements needed to be objective so that the method would be suitable for evaluating dissimilar vehicles and different types of pump.

Noise is an important consideration when a consumer is selecting a new vehicle. It is therefore imperative [...]

Made To Measure

James Wren — Tue, 06 Jun 2006 10:20:17 +0000

In this note the different types of transducers that can be used with the Prosig P8000 series data acquisition system are discussed. The article deals with the design and function of the different types of transducer and the applications they are normally associated with.

Accelerometers

An accelerometer is an instrument used to measure acceleration. It is normally attached [...]

Exhaust Development Using A Prosig P8000 System

James Wren — Mon, 20 Feb 2006 11:17:48 +0000

The following note describes an application of the Prosig P8000/DATS system in the refinement of an automotive exhaust muffler design for a major after-market [...]

A Simple Noise Test

James Wren — Fri, 26 Aug 2005 19:53:35 +0000

In a recent article we described how the Prosig P8000 hardware and DATS software had been used to help Dalmeny Racing diagnose a problem with an exhaust bracket [...]

Correlation Example

Dr Colin Mercer — Wed, 06 Jun 2001 14:22:29 +0000

To illustrate the use of the cross correlation function, a source location example is shown below. For this it is assumed there is a noise source at some unknown position between 2 microphones. A cross correlation technique and a transfer function like approach were used to determine the location.

To simulate the noise a broad band [...]