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Wednesday, November 30, 2016

Google doodle 2016-11-30 – Jagadish Chandra Bose

Today’s Google doodle celebrates the 158th birthday of Jagadish Chandra Bose who, among many other things, did quite a bit of work in radio and microwave detection.

From Wikipedia:

Bose’s first scientific paper, “On polarisation of electric rays by double-refracting crystals” was communicated to the Asiatic Society of Bengal in May 1895, within a year of Lodge’s paper. His second paper was communicated to the Royal Society of London by Lord Rayleigh in October 1895. In December 1895, the London journal the Electrician (Vol. 36) published Bose’s paper, “On a new electro-polariscope”. At that time, the word ‘coherer’, coined by Lodge, was used in the English-speaking world for Hertzian wave receivers or detectors.

Bose was the first to use a semiconductor junction to detect radio waves, and he invented various now-commonplace microwave components.[24] In 1954, Pearson and Brattain gave priority to Bose for the use of a semi-conducting crystal as a detector of radio waves.[24] In fact, further work at millimetre wavelengths was almost non-existent for the following 50 years. In 1897, Bose described to the Royal Institution in London his research carried out in Kolkata at millimetre wavelengths. He used waveguides, horn antennas, dielectric lenses, various polarisers and even semiconductors at frequencies as high as 60 GHz;.[24] Much of his original equipment is still in existence, especially at the Bose Institute in Kolkata. A 1.3 mm multi-beam receiver now in use on the NRAO 12 Metre Telescope, Arizona, US, incorporates concepts from his original 1897 papers.[24]

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