½” Schallintensitäts-, Schalldruck- und Schallschnellen-Sonde

WA101 eindimensionale schallintensitätssonde

Weles Acoustics WA101 ist eine Universal-Schallintensitätssonde, die auf der direkten Messung von Schalldruck und Schallschnelle basiert. Die WA101 besteht aus zwei Wandlern: einem herkömmlichen Kondensatormikrofon und einem Weles-Schallschnellesensor. Fast das gesamte akustische Frequenzband (20 Hz bis 10 kHz) kann mit nur einer Messung analysiert werden – es werden keine Abstandshalter benötigt, um die Schallintensität in diesem Frequenzbereich zu messen. Detaillierte Informationen zu jedem Schallfeld können ohne jegliche Einschränkungen der Messung gewonnen werden – alle akustischen Größen werden direkt gemessen.

Jede WA101-Sonde wird mit einer Weles BOX geliefert. Die Verbindung zwischen Sonde und BOX erfolgt über ein 7-poliges LEMO-Kabel. Die BOX ist dafür ausgelegt, alle in der Sonde eingebauten Messelemente mit Strom zu versorgen. Darüber hinaus fungiert die Weles BOX als Schnittstelle zu jedem Datenerfassungssystem, das die von der Sonde bereitgestellten analogen Signale verarbeiten soll. Für den Typ WA101 werden zwei Signale über zwei BNC-Anschlüsse ausgegeben: Schalldruck und Schallschnelle.

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Verfügbare Konfigurationen:

• WA101H - PU-Schallintensitätssonde mit Live-Wiedergabe
• WELES BOX X - Weles BOX X ist eine integrierte Lösung für PU-Sondenarrays

Wichtigste anwendungsbereiche:

• Schallquellenlokalisierung und -bewertung – höchste Leistung, räumliche Auflösung und Genauigkeit werden durch Nahfeld-Schallschnellemessung erreicht
• Schallschnelle-Kartierung
• Schallintensitäts-Kartierung
• Schallleistungsmessung
• Schalldruckmessung
• Schnelle Fehlerdiagnose – Schallschnelle anhören

LEISTUNGSBESCHREIBUNG:

Typischer Frequenzgang – Schallschnellesensor:

Typical frequency response – sound pressure microphone:

Typical self noise – sound pressure microphone/particle velocity sensor:

Technology

Sound intensity is defined as the product of sound pressure and particle velocity. The WA101 sound intensity probe consists of two acoustic transducers: sound pressure microphone and Weles particle velocity sensor. Both quantities are measured directly, thus allowing to establish the sound intensity in the entire frequency range covered by WA101 probe. No spacers are required in order to measure sound intensity. The entire acoustic bandwidth can be analyzed with just one measurement. However, no standards yet exist for measuring sound intensity with PU probes.

Weles Acoustics designs and manufactures particle velocity transducers. Particle velocity is a physical quantity that together with sound pressure fully characterizes any sound field. Intrinsic characteristics of particle velocity physics coupled with distinctive features of the Weles sensor make it a unique tool for sound source localization.

Working principle of the particle velocity sensor is similar to a hot wire anemometer. The sensor consists of several thin platinum strings. These strings are heated to a near incandescent temperature. Passing sound waves alter the temperature, and in turn the electrical resistance of the heated strings. The resulting voltage difference is proportional to the acoustic particle velocity.
The Weles particle velocity sensor is directional. Its polar pattern resembles a figure-of-eight. It is a bi-directional transducer. Thanks to this trait and the nature of particle velocity, the transducer is a powerful diagnostics tool for any noise or vibration issues – even in the presence of high levels of background noise.

Design

The casing of WA101 sound intensity probe is built out of high quality stainless steel. The head of the probe was engineered to provide maximum acoustic transparency while maintaining protection for both sensing elements from particles of dust, sand or oil. The robust and durable housing encloses a 3D printed mechanical sound amplifier that is built around the Weles particle velocity sensor. The mechanical amplifier is covered with a thin metal mesh. The goal of the mesh is to decrease the impact of DC airflow on particle velocity measurements.

The mechanical amplifier is designed to increase the signal-to-noise ratio of the velocity transducer, as well as provide a mounting point for the electret sound pressure microphone. Thanks to this unique architecture, sound intensity is measured almost exactly at the same point. The distance separating both sensing elements is smaller than 8mm making the WA101 a very compact and capable solution.

WA101 probe is built, assembled and tested by Weles Acoustics. Each probe is calibrated and mechanically tested to withstand minor shocks and excessive vibration – This PU sound intensity probe is built to endure.

System components:

The WA101 Sound Intensity probe comprises the following items:

• WA101 PU Sound Intensity probe
• Weles BOX WA101
• 7 pin male LEMO to 7 pin male LEMO cable
• 5V Power supply
• USB Power cord
• Protective case
• Calibration certificate

Weles Acoustics reserves the right to change specifications without notice.

WA101 PU Probe - Optional hardware

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