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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

2.1K
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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Miniature Broadband NIR Spectrometer Based on FR4 Electromagnetic Scanning Micro-Grating.

Liangkun Huang1,2, Quan Wen1,2, Jian Huang1,2,3

  • 1Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology, Chongqing University, Chongqing 400044, China.

Micromachines
|April 16, 2020
PubMed
Summary

A new miniaturized near-infrared (NIR) spectrometer uses a novel flame-retardant 4 (FR4) scanning micrograte for broadband spectral analysis. This compact device achieves high signal-to-noise ratio and stability across the 800-2500 nm range.

Keywords:
flame-retardant 4 (FR4)micro-NIR spectrometerscanning grating micromirror

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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Materials Science

Background:

  • Miniaturization of optical instruments is crucial for portable and field applications.
  • Broadband near-infrared (NIR) spectroscopy requires efficient spectral dispersion and detection.
  • Traditional spectrometers often face limitations in size, complexity, and cost.

Purpose of the Study:

  • To present a miniaturized, broadband NIR spectrometer design.
  • To demonstrate the efficacy of a novel flame-retardant 4 (FR4)-based scanning micrograte.
  • To achieve high performance metrics including signal-to-noise ratio (SNR) and spectral stability in a compact form factor.

Main Methods:

  • Developed an astigmatism-free optical system using a 90° off-axis parabolic mirror and a crossed Czerny-Turner structure.
  • Integrated a novel FR4-based scanning micrograte for spectral dispersion and spatial scanning.
  • Utilized a two-color indium gallium arsenide (InGaAs) diode and an angle sensor for closed-loop control and calibration.

Main Results:

  • Achieved a working wavelength range of 800-2500 nm.
  • Obtained spectral resolution of 10 nm (800-1650 nm) and 15 nm (1650-2500 nm).
  • Demonstrated excellent spectral stability (< ±1 nm and < ±2 nm), high SNR (284), and a compact volume (80 × 75 × 65 mm³).

Conclusions:

  • The FR4-based scanning micrograte enables a highly miniaturized and efficient broadband NIR spectrometer.
  • The spectrometer design offers robust performance suitable for various analytical applications.
  • This technology advances portable spectroscopic instrumentation.