this article has multiple issues . please help improve it or discuss these issues on the talk page . learn how and when to remove these template messages this article contains content that is written like an advertisement . please help improve it by removing promotional content and inappropriate external links and by adding encyclopedic content written from a neutral point of view . march 2013 learn how and when to remove this template message a major contributor to this article appears to have a close connection with its subject . it may require cleanup to comply with wikipedia s content policies particularly neutral point of view . please discuss further on the talk page . february 2014 learn how and when to remove this template message learn how and when to remove this template message br el & kj r sound and vibration measurement a s type private company industry engineering sound & vibration founded 28 november 1942 founder per vilhelm br el and viggo kj r headquarters n rum denmark area served worldwide key people lars r nn managing director products sound measurement vibration systems revenue dkk991 million 2011 1 profit dkk186 million 2011 2 number of employees 1 150 2013 parent spectris website www.bksv.com br el & kj r sound and vibration measurement a s is a danish multinational engineering and electronics company headquartered in n rum near copenhagen . it is the world s largest manufacturer and supplier of sound and vibration measurement equipment systems and solutions 3 4 br el & kj r is a subsidiary of spectris which has annual sales of 1.1 bn and employs around 7 500 people worldwide across its four business segments contents 1 founders 2 operations 3 br el & kj r corporate management team 4 products 5 markets 5.1 aerospace 5.1.1 airframes 5.1.2 aero engines 5.1.3 aerospace 5.1.4 br el & kj r s main customers in this market include 5.2 defence 5.2.1 acoustic stealth discretion 5.2.2 identifying noise sources 5.2.3 maintaining operational integrity 5.2.4 environmental noise impact testing and monitoring 5.2.5 br el & kj r s main customers in this market 5.3 automotive 5.3.1 cabin noise 5.3.2 wind tunnel testing 5.3.3 setting targets 5.3.4 benchmarking 5.3.5 material testing 5.3.6 br el & kj r s main customers in this market 5.4 telecom and audio 5.4.1 entertainment systems 5.4.2 hearing aids and telephones 6 organisational developments 7 see also 8 references 9 similar companies competitors 10 external links founders edit br el & kj r was founded by per vilhelm br el b. 6 march 1915 d. 2 april 2015 and viggo kj r b. 5 june 1914 d. 25 july 2013 on 28 november 1942 . the two men met while studying at the polytechnic school in copenhagen now the technical university of denmark . after receiving their m.s. degrees in 1939 they decided to start a company developing instruments for acoustic measurements . holger nielsen joined the company as third partner in 1945 and was with the company until his death in 1978 . operations edit br el & kj r s headquarters in n rum denmark br el & kj r s global offices br el & kj r s office in osaka japan br el & kj r s office in pointe claire canada br el & kj r sound & vibration a s headquarters n rum denmark . br el & kj r inc. north america atlanta georgia . br el & kj r canada pointe claire canada . br el & kj r uk ltd. hertfordshire united kingdom . br el & kj r gmbh local offices in bremen and ismaning germany . br el & kjaer france mennecy france . bruel & kjaer italia srl milan italy . br el & kj r australia local offices in melbourne and sydney australia . br el & kj r japan local offices in tokyo osaka and nagoya japan . br el & kj r gmbh zweigniederlassung sterreich vienna austria . br el & kj r svm a s moscow russia . br el & kjaer ib rica s.a local offices in madrid and barcelona spain . br el & kj r s & v measurement a s local offices in bor s huddinge and rebro sweden . br el & kj r division of spectris korea ltd. sungnam si south korea . br el & kj r corporate management team edit the corporate management team consists of 5 s ren holst managing director since 2015 . before joining br el & kj r s ren was president of gn otometrics for 11 years . prior to joining gn otometrics s ren was president of oticon inc. arne rasmussen vice president finance & administration . arne rasmussen joined br el & kj r as vp of f & a in 2006 . before joining br el & kj r arne was financial director at jai a s and financial manager at ambu a s. martin adams vice president br el & kj r environment management solutions martin adams joined the br el & kj r management team in 2009 following the acquisition of lochard ltd. martin was co founder and ceo of lochard in 1990 and prior to this worked for schlumberger and honeywell information systems . alan humphrey vice president of global sales alan humphrey joined the management team in 2008 . he has worked for br el & kj r as president of bruel & kjaer north america inc. since february 2003 . prior to joining br el & kj r alan worked for 15 years at mts systems in various management roles . torben bj rn vice president of operations torben bj rn joined the management team in 1997 . torben has a background of over 30 years in various project and managerial roles in br el & kj r. lars agerlin vice president of research & development lars agerlin joined br el & kj r as vp of r & d in 2008 . he came from a position as senior vice president at simcorp . prior to joining simcorp lars worked for 11 years at nokia in various management roles . alun crewe vice president of strategic marketing alun crewe joined the management team in 2008 . he has worked for br el & kj r since 2003 as product marketing manager . prior to joining br el & kj r alun worked in various positions for mts systems and sdrc in the us and uk . products edit some of the products developed over 70 years include 1940s precision measurement instruments including radio frequency analysers and geiger counters.the first br el & kj r instrument produced was type 2401 a vacuum tube voltmeter . the success of the company started with type 2301 in 1949 . since then it has been updated a number of times . the latest version type 2307 was introduced in 1972 . in 1943 br el & kj r launched type 4301 the world s first charge accelerometer thus entering the field of vibration measurement . 1950s sound and vibration measurements including development of logarithmic level recorders signal generators and frequency analyzers . 1960s measurement microphones preamplifiers and calibrators along with iec standardised precision sound level meters . 1970s parallel analyzers including the world s first analyzer to use digital filters . 1980s the first commercially available instrument for sound intensity measurement and expansions of the range of instruments ; for example dual channel fft analyzers . 1990s multichannel and multi analysis systems including acoustical holography array systems . 2000s surface microphones and lan xi modular data acquisition hardware . new technologies such as teds dyn x req x. markets edit aerospace edit x airframes edit analysing and helping with the design of airframe structures br el & kj r s structural dynamics testing encompass modal analysis and virtual model validation and updating for finite element analysis . operational testing such as vibration troubleshooting and ground vibration tests are covered by a range of scalable systems . 6 aero engines edit br el & kjaer delivers technologies for the sikorsky mh 60r which was chosen by the rdaf as replacement for the lynx helicopter in 2012 br el & kj r provides tools to overcome noise and vibration challenges . these ensure the quality of new lighter material applications by modal testing and improving the quality and test efficiency in aero engines . systems include those for development and measurement of new noise optimised engine acoustic lining designs and propagation code validation engine duct modal analysis far field noise measurement and acoustic panel in situ impedance measurement br el & kj r also supplies in flight engine monitoring with flight certified high temperature accelerometers . 7 noise is a pressing issue at airports so any significant development at an airport needs to consider the corresponding change in noise impact . most airports have noise abatement policies that restrict operations in order to limit the noise impact . br el & kj r provides solutions that link positional data from radars to information about each aircraft operation to actual noise levels measured on the ground . the system knows where aircraft are what they are who is operating them and how much noise they make every time they arrive and depart the airfield . this data is processed to help the airport police its noise abatement policies ranging from departure track keeping monitoring noise limits and levying fines for noisy aircraft enforcing night curfews and ensuring environmentally efficient procedures are used such as continuous descent on approach . data is also aggregated to provide management information illustrating trends and reporting activity to stakeholders . a third arm enables the airport to manage investigate and respond to noise complaints increasing understanding of the airport and providing important data to track changes in the perception of the environmental impact of the airport . 8 aerospace edit nasa s mars rover curiosity was tested using a br el and kj r lds shaker system br el & kj r supplies products like data acquisition systems and vibration test systems lds to many customers in the aerospace industry such as its lds v994 shaker which was used to test nasa s mars curiosity rover . 9 other systems have tested astrium s satellite prior to launch 10 and performed qualification and acceptance testing such as the integrated lan xi data acquisition systems used by the national institute for space research in brazil inpe . 11 br el & kj r s main customers in this market include edit airbus aircraft strength research institute boeing eads eurocopter rolls royce and sukhoi . some of br el & kj r s space customers are shown on br el & kj r s website here defence edit acoustic stealth discretion edit acoustic stealth and discretion play a vital role in ship and submarine operations . br el & kj r supplies systems for noise signature management acoustic ranging of submarines and surface ships ; noise source investigation during design and build ; and for acoustic trials and self noise monitoring during operations . br el & kj r also supplies systems for underwater acoustics shock testing noise and vibration testing and structural dynamics testing . 12 identifying noise sources edit br el & kj r offers products that cover a wide range of acoustic customer oriented solutions ranging from simple sound level measurements to the most sophisticated microphone array systems using advanced algorithms and hardware . these solutions are provided for air vehicle noise certification exterior noise analysis such as fly over testing using acoustic holography beamforming sonah and high temperature sensors noise source identification to examine e.g. ramp noise or sonic booms microphone calibration systems and more . 13 maintaining operational integrity edit the company provides products that aid preventative maintenance and manufacturer specified checks to prolong the health of engines . these products take the form of real