Performance of the Reflectivity Measurement in a Reverberation Chamber

Statistical Characterization of a Vibrating Intrinsic Reverberation Chamber using the AIRCMF Method and S11 Measurements

Conventional reverberation chamber characterization methods, such as field uniformity measurements specified in IEC 61000-4-21, can be timeconsuming and require extensive spatial sampling. This work investigates the application of the Almost Ideal Reverberation Chamber Minimum Frequency (AIRCMF) method, originally prop...

Measurement of Sound Absorption Coefficient under Anechoic Conditions by Transfer Function Method

The sound absorption coefficient is a fundamental parameter for characterizing acoustic materials, widely used in building acoustics, noise control engineering, and material design. Its accurate determination, however, remains a challenging task due to the strong dependence on measurement conditions, sound field charac...

Evaluation of uncorrelated acoustic noise

A system is proposed that provides an estimate of the attenuation of acoustic signals during propagation in an urban environment. A full-spectrum measurement mode is provided for the entire audio range with a two-channel measurement circuit. The estimate is given taking into account the delay time of the signal during...

Improving the accuracy of coordinate measurements of a multi-position passive meter for continuous radiation sources

BACKGROUND: Correlation processing of signals in a passive multi-position meter is based on the fact that the cross-correlation function is recovered from the received signal realizations at different positions according to the primary parameter—delay—and the current measurement of the primary parameter—the signal arri...

Determination of the positioning uncertainties for a traceable measurement of the Modulation Transfer Function MTF

In recent years, PTB has established a measuring setup for determining the Modulation Transfer Function (MTF) conforming to a setup described in ISO 9335. It is designed to measure the MTF of lenses with focal lengths between 25 and 150 mm on the optical axis and in the image field of the tested lens within an angular...

Study of the Characteristics of the BBC Detector Prototype