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We are now LIVE! It's been very busy even before the official start of the project in September. The homepage is now available, and the first document available is a Summary of the project. shorturl.at/fuGW9 #lowfrequency #airbornesound #vibration #underwatersound

We have high expectations for this project. Spread the news.

Thanks to Dr Beth Mortimer @OxZooDept and photographer Robbie Labanowski for allowing us to use this impressive picture of a male elephant in our profile. A great example of how these animals use low frequency vibration and sound to communicate. #lowfrequencysound #lowfrequencyvibration

There is new content on the project's homepage. 1. A very instructive article on how to access publicly available seismic (and infrasound) waveform data from the Federation of Digital Seismograph Networks (FDSN) web-services. ptb.de/empir2020/infr…

2. A descriptive paper on the primary methods for establishing the reference for very low frequency sound in air that are researched in the project. ptb.de/empir2020/infr…

and, 3. A note on the recent changes proposed to the IEC International Standard 61094-2 concerned with the primary calibration of microphones using reciprocity technique. ptb.de/empir2020/infr…

Last week, after almost 9 weeks of intensive work, we hold our first (online) project meeting. We got presentations describing interesting and promising results from active workpackages. Some of them are already in the project's homepage.

For instance, an entry on a new calibration apparatus designed for airborne secondary calibration of measurement instruments such as sound level meters and microphones at low frequencies: tinyurl.com/4ue72khk ...

and another one on a novel infrasound calibration device based on refratrometry using a Fabry-Pérot cavity. tinyurl.com/2fnnuju3

We are happy to share that a new open-access guidance document on specifications and testing strategies for measurement devices for noise exposure determination in the infrasound frequency range has been published. Find it at oar.ptb.de/resources/show…

It is always nice to get support from the EU: In his Plenary Talk at CTBTO's Science and Technology conference EU-Ambassador Stephan Klement emphasized the importance of the objectives driving Metrology for Low Frequency Sound and Vibration . #LowFrequency #InternationalMonitoringSystem tinyurl.com/9b4by782

We are starting our information meeting. Join! ptb.de/empir2020/infr…

The direct link to the information meeting is conf.dfn.de/stream/nr5opek…