More Definitions for photomultiplier tube, More from Merriam-Webster on photomultiplier tube, Britannica.com: Encyclopedia article about photomultiplier tube. (Keywords: automation * microarrays * optics), Atom tinkerer's paradise: innovations to atom-imaging microscopes create labs on tips, Photon Amplification By Stimulated Emission of Radiation :-), Photon Assisted Scanning Tunnel Microscopy. These multiplied electrons are converted into an output signal by the anode. Photomultiplier tubes operate using photoelectric effect and secondary emission. Most often a photocathode is semi-transparent and usually consists of a thin layer of evaporated Cs, Sb, and K atoms (or a mixture of all three). er tube a detector that amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3-4 electrons are liberated and accelerated to the subsequent dynode. * Consists of a vaccum tube with a photocathode followed by a cascade of cathodes. It is used to digitize incoming light photons prior to the creation of computerized images in nuclear medicine and other imaging modalities. Photomultiplier Tubes An electron multiplier phototube, more commonly known as a photomultiplier tube (PMT) or simply phototube is designed to convert faint incoming light into an amplified electrical signal.. Photomultiplier Device used in photometry for the amplification of light by the release and acceleration of electrons from a sensitive surface. Photomultiplier Tubes (PMT) PMT is the technology state of the art at present. photomultiplier tube definition: A vacuum tube that converts light into electrical energy and amplifies it. Photomultiplier tubes having both of the following characteristics: a. WikiMatrix. photomultiplier tube definition: A vacuum tube that converts light into electrical energy and amplifies it. er tube a detector that amplifies a signal (by as much as 106) of electromagnetic radiation by an acceleration of electrons released from a photocathode through a series of dynodes; as each electron strikes a dynode stage, 3-4 electrons are liberated and accelerated to the subsequent dynode. 8 - Photomultiplier tube basics Still setting the standard For more than sixty years, photomultipliers have been used to detect low-energy photons in the UV to visible range, high-energy photons (X-rays and gamma rays) and ionizing particles using scintillators. What made you want to look up photomultiplier tube? Accessed 8 Jan. 2021. The photomultiplier tube converts the light into an electrical signal, and the shape of the electrical pulse reveals which layer is flashing, and thus which type of radiation was detected. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! WikiMatrix. en.wiktionary.org. The photomultiplier is an extremely sensitive light detector providing a current output proportional to light intensity. The SiPM features low-voltage operation, insensitivity to magnetic fields, mechanical robustness and excellent uniformity of response. Definition of Photomultiplier Tube (PMT): A part of the PET detector that receives the electromagnetic energy from the scintillator cristal and transforms that energy into electric pulses. ; The electrons are subsequently accelerated with a high voltage (hundreds of volts) to a first dynode (an electrode), where they generate several secondary electrons. photomultiplier tube. PMT (abbreviation) Hypernyms . An array of these tubes is situated behind the sodium iodide crystal and may be placed directly on the crystal, connected to the crystal by light pipes, or optically coupled to the crystal with a silicone-like material. Figure 2-1 shows the schematic construction of a photomultiplier tube. A piece of 1-mm thickness optical glass was mounted at the bottom of the reservoir; photons produced during the Ru[(bpy).sub.3.sup.2+] ECL reaction passed through the glass window and were detected by a. A photomultiplier tube (PMT) converts a light pulse into an electrical signal of measurable magnitude. The operation of scintillation counters and photomultiplier tubes is summarized in the following points:. en.wiktionary.org (physics) A device, normally in the form of a tube, that uses a photocathode to convert photons into photoelectrons which are then amplified. Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. The key advantage of a photomultiplier tube is that photoelectrons are amplified using a chain of dynodes. Photomultipliers are used to measure any process which directly or indirectly emits light. * Consists of a vaccum tube with a photocathode followed by a cascade of cathodes. The elements constituting the reader used in the chemiluminescent assays were as follows: two lasers for reaction mixture illumination; an illumination chamber; optical train with collimating lenses, filter wheel, and shutter; The BlankCell procedure serves to calibrate the chemiluminescence signal received by the, The light drives the photoelectric effect in a, Using readings from a sensitive light detector called a, So now, you're dealing with the problem of getting your signal above the noise level of the, Beth models are equipped with three detectors including a, Czerepinski notes, "that along with being designed for simultaneous acquisition of Cy3 and Cy5 the device features real-time control of a, 31 Physical Review Letters, the duo described using a sensitive, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Determination of sulpiride by capillary electrophoresis with end-column electrogenerated chemiluminescence detection, Quantification of DNA using the luminescent oxygen channeling assay, Dally BlankCell procedure in Elecsys 2010 improves the reproducibility of thyrotropin, free thyroxine, and triidothyronine, New, renewed, and revived confocal: higher performance and more affordable confocal microscopes now provide biologists with views into living cells that they've never had before, UV-Vis-NIR Spectrophotometer with deep measurement capabilities, Photomultiplier tube delivers high-anode sensitivity, Creating imaging platforms for discovery: in the high-tech, highly competitive world of microarray scanners, researchers and lab managers have an assortment of imaging systems to choose from ... and the race just got more crowded. They are widely used in medical equipment, analytical instruments and industrial measurement systems. Photomultiplier tubes (often abbreviated as PMT) make use of this external photoelectric effect and are superior in response speed and sensitivity (low-light-level detection). A vacuum tube that converts light into electrical energy and amplifies it. These electrons are focused towards the electron multipliers (dynodes), which multiply the signal by secondary emission. photomultiplier tube (plural photomultiplier tubes) (electronics) A type of vacuum tube that detects electromagnetic radiation in the range from ultraviolet to infrared, including the visible spectrum, and them amplifies the detection induced current into an output signal; Synonyms . Photomultiplier tubes (often abbreviated as PMT) make use of this external photoelectric effect and are superior in response speed and sensitivity (low-light-level detection). PMT is a well established technology. Photomultiplier Tubes (PMTs) Light (photons) are converted into photoelectrons by absorbing them in a thin photocathode layer inside a (glass) vacuum tube. Meaning of photomultiplier. en.wiktionary.2016 [noun] plural of [i]photomultiplier tube[/i] Example sentences with "photomultiplier tubes", translation memory. : Photomultiplier Tubes – Basics and Applications. A channel photomultiplier tube photocathode consists of a @[email protected] electron multiplier (CEM) system for the photoelectrons, and an @[email protected] to collect the final electron current. Definition: Device for producing amplified signal from a photo-detector. Information and translations of photomultiplier in the most comprehensive dictionary definitions resource on the web. Definition of photomultiplier tube (PMT) Photomultiplier tubes (PMTs) convert photons to an electrical signal. en.wiktionary.2016 [noun] A device, normally in the form of a tube, that uses a photocathode to convert photons into photoelectrons which are then amplified. A photomultiplier absorbs light emitted by the scintillator and re-emit it in the form of electrons via the photoelectric effect. photomultiplier Definitions. Photomultiplier detection system DC operation (contiuous light beam) AC operation (chopped light beam) [Cell definitions and equations] [Student assignment handout] [OpenOffice and Excel Version] A simulation of measurement of light intensity by a photomultiplier tube (PMT). Wieder ab designed to convert light photons prior to the creation of computerized images in nuclear medicine and other data. To measure any process which directly or indirectly emits light tubes, including dictionary Merriam-Webster! 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