Photo Tube

Photo Tube
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A phototube or photoelectric cell is a type of gas-filled or vacuum tube that is sensitive to light. Such a tube is more correctly called a 'photoemissive cell' to distinguish it from photovoltaic or photoconductive cells.
A phototube, also known as a photoelectric tube, is a light-sensitive electronic device designed to emit an electric current when exposed to light or other forms of electromagnetic radiation. Commonly referred to as the "electric eye," phototubes find applications in various light-sensing scenarios.
A phototube is a photoemissive detector, also called a photoelectric cell or vacuum photodiode. It consists of a glass tube with a photosensitive cathode and an anode, utilizing the external photoelectric effect to generate a photocurrent proportional to the incident light power.
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For example, a phototube could be used to determine if the sun was up: If current flows across the tube, then we know that light is bombarding the cathode and ejecting electrons into the vacuum gap. For essentially any application that requires detecting light, you can use a phototube.
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The phototube works by having light strike the almost flat transparent end of the tube (the photocathode) (see the tube photo below). Electrons are ejected from the cathode and move through the tube to the anode at the other end. These simple photo sensors have been replaced by solid state devices. The phototube is related … Continue reading Phototube
The quantum efficiency of a phototube depends on factors such as the photocathode material, tube glass, optical wavelength, and angle of incidence. Various cathode materials are available for different light wavelengths. Phototubes come in different geometries, such as "head-on" and "side-on" tubes, based on the direction of incident light.
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The phenomenon of secondary emission (the ability of electrons in a vacuum tube to cause the emission of additional electrons by striking an electrode) was, at first, limited to purely electronic phenomena and devices (which lacked photosensitivity). In 1899 the effect was first reported by Villard. [5] In 1902, Austin and Starke reported that the metal surfaces impacted by electron beams ...
A phototube, a piezoelectric ceramic and a thermistor are used to design neurons sensitive to light, sound and temperature respectively. A resistor, an inductor and a capacitor (RLC) are used to interconnect these neuron circuits to create this simple neuron network.
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The phototube works by having light strike the almost flat transparent end of the tube (the photocathode) (see the tube photo below). Electrons are ejected from the cathode and move through the tube to the anode at the other end. These simple photo sensors have been replaced by solid state devices. The phototube is related … Continue reading Phototube
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A phototube, also known as a photocell, is a type of vacuum tube that utilizes the photoelectric effect to generate a current that is proportional to the amount of energy that strikes the cathode of the tube.
Vacuum Type Photocell (or Phototube): This device essentially consists of a thin metal curved sheet with its concave surface coated with Photoemissive cells material forming the cathode and a rod mounted at the centre of the curvature of the cathode forming the plate or anode mounted and enclosed in an evacuated glass envelope as shown in Fig ...
Photo Tubes - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. The document summarizes phototubes, which use the photoelectric effect to convert light into an electrical signal. Phototubes contain a photocathode that emits electrons when illuminated, and an anode that collects the electrons, producing a photocurrent. Different photocathode materials ...
Operating circuits for phototubes Figure 1 shows an operating circuit example using the photo-tube bias voltage also for the power to an operational amplifi-er. The feedback resistance Rf should be chosen so that the output voltage becomes 0.1 V to 1 V. Cf must be placed for stable operation and should be between 10 pF and 100 pF. It is recommended to use a low-bias-current, low-offset-current ...
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In the same year, Stoletow published in the Journal de Physique an account of an experiment which approached modern photoelec tric techniques. A coarse metallic mesh grid was placed between a highly polished pure zinc plate and a source of ultraviolet light. Connected in series between the plate and the grid was a source of emf and a high-resistance galvanometer (Fig. 2) . As the plate was ...
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Photo Tube - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Phototubes are vacuum tubes that are sensitive to light. They operate via the photoelectric effect, where photons knock electrons from a photocathode, which are attracted to an anode to create a current dependent on the light's frequency and intensity.
Avoid subjecting the phototube to direct sunlight or other high-intensity light, as this can adversely affect the photo-cathode, causing not only loss of sensitivity but instability as well.
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A phototube is defined as an evacuated glass tube or a low-pressure gas tube coated with a sensitive layer that emits electrons when exposed to light, generating a current that can be amplified to measure light intensity.
A phototube is a type of vacuum tube that is extremely sensitive to light.
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A phototube 1 (or "photoemissive cell") is a simple vacuum tube device that works by the photoelectric effect; it produces a current when light strikes the photocathode.
The meaning of PHOTOTUBE is an electron tube having a photoemissive cathode whose released electrons are drawn to the anode by reason of its positive potential.
📜 Description:A Phototube (Photoelectric Tube) is an important electronic device that converts light into electrical signals using the photoelectric effect....
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Hello everyone in this video we are going to see the working principle of Photoelectric Transducer used for Pressure Measurement with the help of Phototube o...
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The phototube and the principle of photoemission are based on quantum mechanics, specifically the science of dealing with the light as discrete "quanta," or "particles" of energy (in contrast to the sciences of color and photography, which treat light in terms of waves).
G Maximum ratings Always operate the phototube within the maximum rating listed in this catalog. G The light input surface area should be as large as possible The output current available from a phototube is determined by the maximum average cathode current and maximum average cathode current density.
Whenever frequency response is import- ant in a phototube circuit, the leads from the phototube to the amplifier or relay tube should be made short so as to minimize capacitance shunting of the phototube load. Since a phototube is a high-resistance device, it is im-portant that insulation of associated circuit parts and wiring be adequate.
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