What Is Charge Injection Calibration (CIC)?
Charge injection calibration (CIC) is invented and patented by Brüel & Kjær in the middle of the 90s, and is a convenient method to verify the integrity of a condenser microphone measurement channel, including the microphone cartridge, without any need for operator interaction.
Hydrophones In Gaseous Environment
The ‘hydro’ in hydrophone is easy to spot. They have been designed for use in water, but those features that make them particularly useful in aquatic environments also translate to gaseous environments.
Measuring Sea Noise With Hydrophone Arrays
Noise pollution, in general, can have some particularly adverse effects on mental and physical health: Increased stress levels, tinnitus, hearing loss and disrupted sleep make up only a partial list. Noise pollution is made up of noise intrusions and the gradual fluctuations in the soundscape’s ambient noise.
Steatoda Bipunctata: Just Not In The Mood
Brüel & Kjær received an unusual request from a Danish film-producer, who was working on a documentary on spiders - or Steatoda Bipunctata to be more precise.
A Quiet Place For Sound
What does it mean to say it’s a quiet room, and how do you measure ‘too quiet‘?
What is Cavitation?
Cavitation is a primary source of propeller noise. The noise is caused by popping bubbles, sort of. They aren’t air bubbles, and they’re not actually popping. They are imploding bubbles of steam.
Diving Deeper Into The Blue Whale Sound
Growing up to 30 m long and 180 tons, the blue whale is the largest animal in the world. In addition to its impressive size, its calls can be heard thousands of kilometres away and far below the ocean’s surface. However, very little is known about these calls and how man-made noises can interfere with them – and what the implications really are.
Epsilon Safeguards The Payload With A Launchpad Redesign
The 2018 launch of Epsilon-3 was more than the successful delivery of the payload to sun-synchronous orbit (SSO). This launch was a culmination of the efforts made to redesign the launchpad and thereby reduce the stress placed on the payload.
Hand-held Microphone Arrays In NVH
Microphone arrays help engineers develop sound quality on vehicles, giving fast and effective noise source identification. Now, advanced new techniques improve the insights possible.
Application of Sound Source Identification on a Turbofan Engine
Identifying acoustic sound sources is a key issue for low-noise design of propulsion systems. The Japan Aerospace Exploration Agency and Brüel & Kjær have been involved in acoustic measurements using sub-scale models and full-scale systems.
Putting The Surface Microphone Through Its Paces at Airbus
Based in Toulouse, France, Airbus is a global company with design and manufacturing facilities in France, Germany, the U.K. and Spain. The cooperation between the various entities that make up Airbus, goes back to the 1920s. Its first aircraft A300B, which was launched at the 1969 Paris air show, was the world’s first widebody twinjet. It could comfortably carry 226 passengers.
Acoustic Camera Displays Noise in 20 Seconds
A simple tool for noise source identification that deploys rapidly to display sound in real-time, and records data for detailed analysis.