Milestone-Proposal:Sonar, 100th birthday of Paul Langevin Invention 1917-2017
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To the proposer’s knowledge, is this achievement subject to litigation? No
Is the achievement you are proposing more than 25 years old? Yes
Is the achievement you are proposing within IEEE’s designated fields as defined by IEEE Bylaw I-104.11, namely: Engineering, Computer Sciences and Information Technology, Physical Sciences, Biological and Medical Sciences, Mathematics, Technical Communications, Education, Management, and Law and Policy. Yes
Did the achievement provide a meaningful benefit for humanity? Yes
Was it of at least regional importance? Yes
Has an IEEE Organizational Unit agreed to pay for the milestone plaque(s)? Yes
Has an IEEE Organizational Unit agreed to arrange the dedication ceremony? Yes
Has the IEEE Section in which the milestone is located agreed to take responsibility for the plaque after it is dedicated? Yes
Has the owner of the site agreed to have it designated as an IEEE Milestone? Yes
Year or range of years in which the achievement occurred:
Title of the proposed milestone:
Paul Langevin's Improvements to Sonar, 1915-1917
Plaque citation summarizing the achievement and its significance:
At Ecole de Physique et Chimie Industrielles de Paris in France, from 1915 to 1917, Paul Langevin designed a submarine detector using piezoelectric quartz crystal transceivers. This improved method for submarine ultrasonic echo detection, (later known as sonar), obtained 4000-meter echo soundings from the cable ship Charente in the Bay of Biscay and was later successfully used during world war II. Echo sounding based on the piezoelectric effect led also to other applications such as medical echography and diverse acoustic sensors.
In what IEEE section(s) does it reside?
IEEE Organizational Unit(s) which have agreed to sponsor the Milestone:
IEEE Organizational Unit(s) paying for milestone plaque(s):
Unit: IEEE France
Senior Officer Name: Amara
IEEE Organizational Unit(s) arranging the dedication ceremony:
Unit: IEEE France
Senior Officer Name: Amara
IEEE section(s) monitoring the plaque(s):
IEEE Section: France
IEEE Section Chair name: Amara
Proposer name: Barbaresco Frédéric
Proposer email: Proposer's email masked to public
Please note: your email address and contact information will be masked on the website for privacy reasons. Only IEEE History Center Staff will be able to view the email address.
Street address(es) and GPS coordinates of the intended milestone plaque site(s):
ESPCI Paris - 10 rue Vauquelin -75005 Paris France
Describe briefly the intended site(s) of the milestone plaque(s). The intended site(s) must have a direct connection with the achievement (e.g. where developed, invented, tested, demonstrated, installed, or operated, etc.). A museum where a device or example of the technology is displayed, or the university where the inventor studied, are not, in themselves, sufficient connection for a milestone plaque.
Please give the address(es) of the plaque site(s) (GPS coordinates if you have them). Also please give the details of the mounting, i.e. on the outside of the building, in the ground floor entrance hall, on a plinth on the grounds, etc. If visitors to the plaque site will need to go through security, or make an appointment, please give the contact information visitors will need. Historic site. Paul Langevin was Professor at ESPCI . Sonar has been invented in ESPCI (Ecole Superieure de Physique Chimie Industrielles) in Paris (http://www.espci.fr/en/)
Are the original buildings extant?
Yes; both the Laboratory and the office of Paul Langevin still exist.
Details of the plaque mounting:
On the wall outside of Langevin's laboratory, facing the building where he had his office.
How is the site protected/secured, and in what ways is it accessible to the public?
The plaque site will be inside the Vauquelin campus that is well secured. For two years from now, the visitors will have to go through security and ask to see it, but in two years, this wall will be next to the future entrance of the campus and visitors will be able to access it freely.
Who is the present owner of the site(s)?
What is the historical significance of the work (its technological, scientific, or social importance)?
The First World War between the eastern and western blocs had created a maritime blockade. Aware of this situation, the German Minister von Brettreich declared: "Our submarines will have completed their glorious task in a few months and we will have won the war". The considerable extent of the maritime losses inflicted on the Allies by the German submarines made therefore necessary all scientific and technological efforts to detect them. In particular Paul Langevin gave up his previous research interests to fully investigate the use of piezoelectric transducers in order to design an ultrasonic detection device. While these efforts had little effect during the first world war since they were mature only by the end of the conflict, they had a considerable impact during the Second World War. These developments had also considerable consequences for civil applications such as, for instance the use of medical ultrasound, to visualize the interior of a non-transparent environment in echography.
What obstacles (technical, political, geographic) needed to be overcome?
In February 1915, Constantin Chilowski submitted to French Minister Paul Painlevé a first project to emit ultrasound using an electromagnetic vibrator powered by high frequency signals similar to those used in wireless telegraphy. Paul Langevin, immediately informed, retained the idea of ultrasound but preferred to direct the research in another direction: to use electrostatic attraction between the fittings of a capacitor. In June 1915, a first experiment was carried out in the laboratory of the Ecole de Physique et Chimie de la Ville de Paris to evaluate the power radiated by a device excited at 100 kHz. A second device emitting at 40 kHz was designed to be immersed. An original solution was chosen: the mica sheet, originally inserted between the fittings of a capacitor, was in direct contact with conductive water. Acoustic range measurements were carried out in December 1915 over a distance of 100 m between the banks of the Seine, then over a distance of up to 2000 m off Toulon; a granular microphone was used as a receiver. In order to improve the detection of acoustic signals - the sensitivity of the granular microphones varied with hydrostatic pressure - Paul Langevin then considered piezoelectricity. In February 1917, he used a quartz blade as a receiver for the first time. Four months later, the same quartz was used as a transmitter. The problem of emission-reception switching having been solved by Marcel Tournier of the laboratory of the Ecole de Physique et Chimie de la Ville de Paris, the detection of echoes of an ultrasonic wave was first carried out in February 1918; the reflector was constituted by the gate of the Vauban basin of the Toulon arsenal (France). On May 4th, 1918, the submarine Messidor was detected at 500 m. Impressed by this invention, the British government delegated the Canadian Richard William Boyle to Paul Langevin. The latter, in charge of coordinating research with the admiralty in this field, went to Toulon. Aware of the importance of underwater acoustics, the Allies met in Paris, just before the armistice, to create the Allied Submarine Detection Investigation Committee (ASDIC). This designation was very successful until the day it was replaced by SONAR (SOund-NAvigation-Ranging), an acronym to which one of the two adjectives "active" or "passive" was added. The latter describes the listening systems that were the only ones used during the conflict, the first being systems based on sound emission followed by detection of the echo returned by a target.
What features set this work apart from similar achievements?
The need to detect an obstacle, such as an iceberg in the case of the Titanic sinking in 1912, had boosted research in the field of radio waves. However in order to detect underwater obstacles, electromagnetic waves were no longer an option, and sound waves were considered. In the first patents the transmitter was a vibrating capacitor associated with a granular microphone [P1, P2]. However the accurate detection of underwater obstacles required the optimization of the transmitter diameter and transmission frequency. This led Paul Langevin to take an interest in piezoelectric quartz and to use it as a receiver [P3]. Since the amplifier associated with quartz in echo reception has a high gain, it was necessary to find a way to avoid blinding it during emission and several "electronic" difficulties had to be solved. The problem of signal recording was solved later on.
Supporting texts and citations to establish the dates, location, and importance of the achievement: Minimum of five (5), but as many as needed to support the milestone, such as patents, contemporary newspaper articles, journal articles, or chapters in scholarly books. 'Scholarly' is defined as peer-reviewed, with references, and published. You must supply the texts or excerpts themselves, not just the references. At least one of the references must be from a scholarly book or journal article. All supporting materials must be in English, or accompanied by an English translation.
Langevin Patents :
[P1] Chilowsky CM, Langevin MP. Procédés et appareils pour la production de signaux sous-marins dirigés et pour la localisation à distance d’obstacles sous-marins. French patent #502913, 1916 Patents,_1916-17_Chilowsky_and_Langevin.pdf
[P2] Chilowsky CM, Langevin MP. Production of submarine signals and the location of submarine objects. US Patent #1471547, 1917 [P3] Langevin MP. 1918 ‘Procédé et appareils d’émission et de réception des ondes élastiques sous-marines à l’aide des propriétés piézo-électriques du quartz’ (Brevet francais, No. 505703, 17 Septembre 1918) pp. 538–542 in: Oeuvres Scientifiques de Paul Langevin, CNRS, Paris,1950 References:  Shaul Katzir, Who knew piezoelectricity? Rutherford and Langevin on submarine detection and the invention of sonar, Notes and Records, The Royal Society Journal of The History of Science, March 7, 2012  David Zimmerman, Paul Langevin and the Discovery of Active Sonar or Asdic, The Northern Mariner/Le marin du nord, XII, No. 1, pp. 39-52, January 2002  Benoit Lelong, Paul Langevin et la détection sous-marine, 1914-1929: Un Physicien acteur de l’Innovation industrielle et militaire, Epistémologiques, Vol.2, n°1-2, p. 205-232, Juin 2002  Manbachi, A.; Cobbold, R. S. C., Development and application of piezoelectric materials for ultrasound generation and detection. Ultrasound 19 (4): 187., 2011
Supporting materials (supported formats: GIF, JPEG, PNG, PDF, DOC): All supporting materials must be in English, or if not in English, accompanied by an English translation. You must supply the texts or excerpts themselves, not just the references. For documents that are copyright-encumbered, or which you do not have rights to post, email the documents themselves to email@example.com. Please see the Milestone Program Guidelines for more information.
Please email a jpeg or PDF a letter in English, or with English translation, from the site owner(s) giving permission to place IEEE milestone plaque on the property, and a letter (or forwarded email) from the appropriate Section Chair supporting the Milestone application to firstname.lastname@example.org with the subject line "Attention: Milestone Administrator." Note that there are multiple texts of the letter depending on whether an IEEE organizational unit other than the section will be paying for the plaque(s).