Page 1 of 26 - About 253 Essays
  • Photon Detection Efficiency (PDE) Of A Sipm?

    What is the photon detection efficiency (PDE) of a SiPM? Photon detection efficiency (PDE) refers to the probability that a photon arriving on the SiPM surface is detected, an initiates the process of current pulse generation. PDE is a function of the overvoltage ΔV across the terminals of the APD and wavelength λ of the incident photon. Photon detection efficiency is one of the most important characteristics of a SiPM. PDE is the product of three factors :- Geometrical fill factor (FF), Quantum Efficiency (QE) and Probability of a Geiger discharge. (Pt) PDE (Vov) = Qe x Pt (Vov) x FF Geometrical fill factor(FF) A SiPM is a pixelated device and all the pixels(microcells) are of the same size and arranged in a tiled pattern. The total area on which the pixels of the SiPM lie is its active area. But in each microcell, only a fraction of its area is photosensitive. This fraction of the photosensitive area, equated to the active area is refferd to as the Geometrical fill factor which ranges from ∼30% to ∼80%. The larger the size of the microcell, the higher the geometrical fill factor. Quantum efficiency (Qe)…

    Words: 1305 - Pages: 6
  • Photodetectors Essay

    electromagnetic spectrum: the ultraviolet, visible and infrared, optical detectors are divided into two main categories: photon and thermal detectors. Photon detectors generate one electron for an incoming photon, which is detected by an electronic circuit, while thermal detectors convert optical energy to heat, which then generates an electrical signal.3 Herein, two types of photodetectors are examined: a PD and a PMT. Although…

    Words: 918 - Pages: 4
  • De Broglie Hypothesis Lab Report

    h / p Where h is the Planck's constant This wavelength λ is called the de Broglie wavelength. The de Broglie hypothesis states that particles of matter also have wavelengths and can behave as waves, like photons .According to String ,both types of particles demonstrated the vibrating strings, but 50 years before. Here was de Broglie’s line of…

    Words: 1169 - Pages: 5
  • Chemistry In The 1800's

    observing it. Often, many elements can have similar emission spectra’s, which is why Kirchhoff invented the Spectrometer. This is a specialized device that uses a prism and two mirrors that allow the light to be conducted into its unique emission spectra. From elements such as lithium to others like selenium, every single element has its own unique color or elemental fingerprint; this is called the emission spectrum. When using a spectrometer, it can be confusing to many what it is they are…

    Words: 1827 - Pages: 8
  • The Importance Of Photometry In The Laser Interferometer

    This effectively increases the length of the arms to 1120 km[2].In addition to the length of the arms, another aspect that greatly influences the LIGO interferometer is the output power of the laser. Sensitivity depends on the arm length and the resolution depends on the laser power. This is because as the power of the laser increases, more photons are generated. When higher number of photons merge at the beam splitter, sharper interference pattern is generated. According to theoretical…

    Words: 1160 - Pages: 5
  • The Atomic Model

    nucleus of an atom, the number of wavelengths that it takes to get around must be quantized; meaning an integer number. Atoms have different energy states each with a specific energy. Photons (basic units of light) interact with electrons by giving or taking away energy. A photon with correct energy and wavelength hits an atom’s electrons, allowing the electrons to jump to a higher energy states which makes the electron “excited”. When a photon is emitted the atom drops to a lower energy state…

    Words: 723 - Pages: 3
  • Advantages And Disadvantage Of Electron Spectroscopy

    materials. 2.5.1.Calculation of Band gap from UV absorption spectrum The UV-Visible spectrum were used to study the optical properties of the synthesized nanoparticles, from this the band gap and the type of electronic transitions were determined. When a semiconductor absorbs photons of energy larger than the gap of the semiconductor , an electron is transferred from the valence band to the conduction band and there occurs an abrupt increase in the absorbency of the material to the…

    Words: 1165 - Pages: 5
  • Ultrafast Electron Microscopy Analysis

    microscope by UV laser pulses. These electron pulses are accelerated inside the microscope and incident on the sample under study together with visible laser pulses. The photon-electron coupling between the optical pulses and the electron pulses takes place when the energy-momentum conservation condition is satisfied (27, 28). This inelastic interaction leads to gain/loss of photon quanta via electron packets, which can be resolved in the electron energy spectrum consisting of discrete peaks,…

    Words: 1738 - Pages: 7
  • Essay On Backwards Causation

    Quantum Entanglement is the theory that there are microscopic particles, usually used to reference particles of light called photons, that are linked together either through some sort of signal or through a different dimension, usually through the fourth dimension. Brian Clegg calls Quantum Entanglement, in the field of physics, or better yet quantum physics, a concept that is so bizarre and so fundamental that he calls it the God Effect. For Quantum Entanglement the effect of one particle…

    Words: 1973 - Pages: 8
  • Wind Energy: The Future Of Renewable Energy

    In 1839, a French physicist Edmund Becquerel proposed that few materials have the ability to produce electricity when exposed to sunlight. But Albert Einstein explained the photoelectric effect and the nature of light in 1905. Photoelectric effect state that when photons or sunlight strikes to a metal surface flow of electrons will take place. Later photoelectric effect became the basic principle for the technology of photovoltaic power generation. The first PV module was manufactured by Bell…

    Words: 742 - Pages: 3
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