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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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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.
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Bandpass Sampling01:17

Bandpass Sampling

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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
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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...
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Note: A simple broad bandwidth undersampling frequency-domain digital diffuse optical spectroscopy system.

Justin Jung1, Raeef Istfan1, Darren Roblyer1

  • 1Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02115.

The Review of Scientific Instruments
|August 3, 2014
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Summary
This summary is machine-generated.

We developed a simplified Diffuse Optical Spectroscopy (DOS) system using off-the-shelf parts and undersampling. This approach significantly reduces complexity and cost for near-infrared measurements in clinical settings.

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Area of Science:

  • Biomedical Optics
  • Medical Instrumentation

Background:

  • Near-infrared frequency-domain technologies like Diffuse Optical Spectroscopy (DOS) show clinical promise.
  • High instrumentation cost and complexity hinder widespread adoption of DOS.

Purpose of the Study:

  • To present a simplified, cost-effective digital frequency-domain Diffuse Optical Spectroscopy (dDOS) system.
  • To demonstrate the feasibility of using undersampling for dDOS measurements.

Main Methods:

  • Constructed a system using readily available components.
  • Employed undersampling techniques for digital signal acquisition.
  • Utilized broadband radio frequency sweeps (50-300 MHz) digitally sampled at 25 MSPS.

Main Results:

  • Successfully extracted amplitude, phase, and optical properties.
  • Achieved accuracy within 5% of network analyzer derived values.
  • Demonstrated significant reduction in system complexity, power consumption, and cost.

Conclusions:

  • Undersampling is a viable method for broad bandwidth dDOS.
  • This simplified system offers a practical alternative to complex and expensive existing technologies.
  • The approach facilitates broader clinical dissemination of frequency-domain optical measurements.