IMAGE DISSECTOR Meaning and
Definition
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The term "image dissector" refers to an early type of video camera tube that was used for capturing images and converting them into electrical signals. Developed in the 1920s, the image dissector was one of the first practical devices used in television technology. It played a crucial role in the transmission and display of visual information.
The image dissector consisted of a sealed glass tube containing various components. At one end of the tube, there was a photosensitive plate covered with tiny photoelectric cells. These cells would generate electrical current when struck by light. The other end of the tube had an electron gun that emitted a beam of electrons.
When exposed to an image, the light from the scene would pass through a lens and strike the photosensitive plate. This released electrons from the plate, which were then attracted and collected by the electron gun. The varying intensity of light in different parts of the image caused the electrical signals to vary correspondingly. These electrical signals were then amplified and further processed to produce a video signal that could be transmitted or recorded.
The image dissector was a significant advancement in the field of television technology as it allowed for the capture and conversion of visual information into electrical signals. It laid the foundation for subsequent developments in television cameras and the overall transmission of visual content. Although outdated by modern standards, the image dissector played a vital role in the early stages of television's history and represents a milestone in the development of image capture technology.
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Etymology of IMAGE DISSECTOR
The word "image dissector" derives from the combination of two terms: "image" and "dissector".
The term "image" comes from the Latin word "imago", meaning "likeness" or "figure". It entered the English language in the 14th century, referring to a representation or visual likeness of something.
The term "dissector" is derived from the Latin word "dissecare", meaning "to cut apart". This term entered the English language in the early 17th century and is commonly associated with the process of anatomical dissection.
When combined, "image dissector" refers to a technology or device used to dissect and capture visual images. Specifically, it refers to a type of cathode-ray tube (CRT) used in early television cameras to convert optical images into electrical signals. The first practical image dissector was developed by Philo Farnsworth in the 1920s.
