The Nor145 Intensity Mode uses the two-channel capability of the analyser to measure the intensity of a sound field. The theory behind intensity measurements may be found below:
The Nor145 Intensity Mode uses the two-channel capability of the analyser to measure the intensity of a sound field. The theory behind intensity measurements may be found below:
The application of intensity measurements is often related to surfaces, and thus, the Nor145 operates with intensity projects. The project contains information about the measurement equipment, environmental conditions, personal notes, pictures etc. Each project is related to a hypothetical measurement surface, enclosing the noise source. Please see the link below for further information:
To simplify navigation and simplify compliance to standards, each project operates with three different scopes. These are designed to provide abstracted information about the total surface, but still enabling detailed analysis of the measurements.
The basic element in project is a segment. Each segment is a small area of the total measurement surface. The segment may consist of several measurements; say a horizontal and vertical scan, and these measurements may be analysed separately or as an average.
Several segments are collected together to make up a surface. The surface has a resulting spectrum, with average and sum values for different functions.
The top level of abstraction is the total surface. Here, the sum of all segments is shown.
The basic measurement functions available in the intensity mode is the Intensity, Ieq(f) and the sound pressure level Leq(f). However, based on the selected measurement standard in the Measurement menu, several additional functions are calculated from the intensity, sound pressure and additional inputs such as the area of a segment.
Please see the following page to get started with Sound Intensity measurements: