English: Microwave
transmitter and
receiver used by Sir
Jagadish Chandra Bose (also written Jagadis Chunder Bose) (30 November, 1858 – 23 November, 1937), in his pioneering experiments with microwaves around 1897. The
spark gap transmitter (right) used a spark gap radiator made of three tiny 3 mm metal balls excited by high voltage from an
induction coil to generate microwaves at 60 GHz. The transmitter was enclosed inside the metal box
(right) to prevent sparks from the coil's
interrupter from disturbing the action of the receiver, and the microwaves emanated from the waveguide
(metal tube). The receiver
(left) used a galena point contact
crystal rectifier inside the horn antenna and a galvanometer to detect the waves. The galvanometer
(left) and battery
(right) are modern replacements for Bose's original apparatus.
Bose was the first to invent the
crystal detector, horn antenna, dielectric lens, and other components now used in microwave apparatus. Jagadish Chandra Bose museum which is the part of the
Bose Institute, Kolkata, is displaying some of the instruments designed, made and used by Sir J. C. Bose with his personal belongings, memorabilia and an exhibition on his Life and Works.
Français : Appareil émetteur et détecteur de micro-ondes (60 GHz) de Bose (au Bose Institute à Kolkata, en Inde). Le récepteur (à gauche) utilisait un détecteur de cristaux de
galène, positionné dans une
w:fr:antenne:antenne cornet et un
galvanomètre pour détecter les micro-ondes. Bose a inventé le détecteur radio à cristal, le guide d'ondes, l'antenne cornet et d'autres appareils utilisés aux fréquences de la gamme des micro-ondes.