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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Updated: Jun 16, 2026

Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing
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Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing

Published on: November 9, 2015

Two-dimensional silicon vidicon astronomical photometer.

T B McCord, J A Westphal

    Applied Optics
    |January 30, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We developed a silicon diode array vidicon photometer for telescopes. This cost-effective digital imaging system offers high quantum efficiency and a large dynamic range for astronomical observations and lab use.

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    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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    Integration of Light Trapping Silver Nanostructures in Hydrogenated Microcrystalline Silicon Solar Cells by Transfer Printing
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    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
    12:19

    Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

    Published on: April 4, 2017

    Area of Science:

    • Astronomy
    • Instrumentation
    • Photonics

    Background:

    • Telescope-based astronomical observations require sensitive and efficient photometers.
    • Digital imaging systems offer advantages in data acquisition and analysis.

    Purpose of the Study:

    • To develop and evaluate an integrating two-dimensional silicon diode array vidicon photometer for astronomical applications.
    • To assess the system's suitability for digital direct imaging and spectroscopy.

    Main Methods:

    • Utilized a silicon diode array vidicon with a 1-cm target.
    • Implemented a current mode preamplifier for signal readout.
    • Digitized video signals and stored them on magnetic tape at 20,000 eight-bit words/sec.

    Main Results:

    • Achieved a minimum detectable signal of approximately 1000 carriers per resolution element.
    • The vidicon exhibits high quantum efficiency (85% at 0.5 µm to 6% at 1.1 µm).
    • The system demonstrates a large dynamic range (>10^3) and linear response.

    Conclusions:

    • The developed silicon diode array vidicon photometer is well-suited for astronomical imaging and spectroscopy.
    • Its high quantum efficiency, large dynamic range, and low cost make it a versatile tool for digital imaging and laboratory applications.