Grating Spectrometer
Grating Spectrometer - Related Videos
08:48
Writing Bragg Gratings in Multicore Fibers
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Cited by 3 •
2016
We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.
01:25
IR Spectrometers
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2024
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...
10:39
Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Cited by 10 •
2016
The measurement protocol and data analysis procedure are given for obtaining transverse coherence of a synchrotron radiation X-ray source along four directions simultaneously using a single 2-D checkerboard phase grating. This simple technique can be applied for complete transverse coherence characterization of X-ray sources and X-ray optics.
13:31
High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Cited by 42 •
2015
Here we present a protocol to build a rapid Brillouin spectrometer. Cascading virtually imaged phase array (VIPA) etalons achieve a measurement speed more than 1,000 times faster than traditional scanning Fabry-Perot spectrometers. This improvement provides the means for Brillouin analysis of tissue and biomaterials at low power levels in vivo.
01:16
Mass Spectrometers
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2024
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions: Conversion of the gas-phase analyte atoms/molecules into a beam of positive or negative charged ions by ionization. Separation of the charged species based on their mass-to-charge ratio. Recording the relative abundance of each type of ion. In the ionization chamber of...
FAQs
The grating’s regularly spaced grooves cause different wavelengths to leave the grating at distinct angles. This angular separation allows the instrument to distinguish closely related portions of a spectrum before the detector measures their intensities. The resulting wavelength-dependent pattern provides the basis for comparing emission, absorption, or transmission features in chemical measurements.
Spectral features can reflect different interactions between light and matter. Atomic emission lines can support elemental analysis, while molecular absorption bands and electronic transitions provide information about molecular or material behavior. Interpreting intensity as a function of wavelength therefore connects the measured pattern with whether a sample emits, absorbs, or transmits particular portions of light.
Calibration is important because it supports precise measurements of wavelength and intensity relationships. A calibrated instrument produces spectra that can be interpreted more reliably when identifying or quantifying chemical substances. This reliability is especially relevant when measurements are used for elemental analysis, reaction monitoring, materials characterization, or comparisons among samples.
A typical measurement directs light from or through a sample onto the diffraction grating. The grating separates the light spatially according to wavelength, and a detector records the intensity across that separated spectrum. The resulting data can then be examined for emission lines, absorption bands, or other wavelength-dependent features relevant to the sample.
Chemists may choose this instrument when they need to identify or quantify substances through their light-related behavior. Supported applications include elemental analysis, reaction monitoring, materials characterization, and precise examination of emitted, absorbed, or transmitted light. Its value depends on obtaining a spectrum whose wavelength features provide chemically relevant evidence about the sample.
Emission measurements can reveal atomic emission lines, whereas absorption measurements can show molecular absorption bands or electronic transitions. Transmission measurements examine how light passes through a sample. These distinct spectral responses allow the same general measurement approach to address different chemical questions, including composition, reaction changes, and properties of materials.