The word "autocoherer" is spelled with the prefix "auto-", meaning self, and the suffix "-coherer", which refers to a device used in early radio technology. The IPA transcription for "autocoherer" is /ɔːtəʊkəʊˈhɪərə/. The first syllable is pronounced with the long "o" sound, followed by the "t" and the short "o" sound in the second syllable. The third syllable begins with the stressed "koe" sound, followed by "huh" and ending with the "ruh" sound in the final syllable.
An autocoherer is an early detection device used in radio technology, specifically in the field of wireless telegraphy. It was invented by Oliver Lodge in the late 19th century and played a crucial role in the development of wireless communication systems.
The autocoherer is a simple tube containing metal filings or loose metallic particles held between two electrodes. When radio waves pass through the tube, the metallic particles coalesce and form a continuous conductive path between the electrodes. This electrical conduction allows current to flow, indicating the presence of radio signals. In the absence of radio waves, however, the metallic particles remain in a loosely packed or non-conductive state, disrupting the current flow.
The functioning of the autocoherer is based on a phenomenon called "coherer effect." This effect occurs when the radio frequency energy induces the formation of temporary conductive chains within the metallic filings, thereby transforming the autocoherer from a non-conductive state to a conductive one. These chains can be dispersed again by mechanical action, such as a sharp tap on the tube.
The autocoherer served as a key component in early wireless telegraphy systems, allowing the reception and detection of electromagnetic waves. It was later replaced by more sophisticated devices, but its invention marked a significant advancement in the field of wireless communication and laid the foundation for further developments in radio technology.
The word "autocoherer" is derived from two separate terms: "auto" and "coherer".
The term "auto" is a prefix derived from the Greek word "autos", meaning "self" or "same". It is used in English to indicate that something is self-operating or self-contained.
The term "coherer" is derived from the Latin word "cohaerere", meaning "to adhere" or "to stick together". It was originally used in the field of science and engineering to describe a device that detects radio waves or electrical signals by causing particles to adhere or stick together, thereby enabling the transmission of signals.
Therefore, the word "autocoherer" essentially denotes a device that is self-operating and utilizes cohesion or adhesion to detect radio waves or electrical signals.