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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....

Raman Spectroscopy Instrumentation: Overview

Raman Spectroscopy Instrumentation: Overview

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...

UV–Vis Spectrometers

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.

NMR Spectrometers: Overview

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...

Atomic Emission Spectroscopy: Instrumentation

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

IR Spectrometers

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...

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Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

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Single-pixel computational spectrometer based on nonlinear spectrum modulation.

Wenqing Yang, Kong Gao, Jie Yuan

|August 13, 2025

Summary

This summary is machine-generated.

This study introduces a new computational spectrometer that uses a modulated light source for active illumination. This compact, low-cost device achieves high spectral resolution, comparable to commercial systems, for object spectrum reconstruction.

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Area of Science:

Optics and Photonics
Spectroscopy
Nonlinear Optics

Background:

Computational spectroscopy often relies on ambient light, limiting applications requiring active illumination.
Existing systems struggle with effective light source spectrum modulation, hindering performance.

Purpose of the Study:

To develop a novel computational spectrometer with integrated light-source spectrum modulation.
To offer a compact, low-cost alternative to conventional spectrometers for active illumination scenarios.

Main Methods:

Utilized polarization-induced nonlinear spectrum modulation for light source control.
Employed wavelength multiplexing and compressed sensing for spectral reconstruction.
Managed polarization-induced nonlinear phase and pump power for periodic spectrum evolution.

Main Results:

Achieved a minimum spectral resolution of 0.2 nm, comparable to commercial spectrometers.
Demonstrated successful reconstruction of sparse and non-sparse spectra via simulation and experiment.
Operated effectively within a spectral range of 1000 nm to 1100 nm.

Conclusions:

The novel spectrometer enables active illumination computational spectroscopy with high performance.
The system's compact and low-cost design makes it suitable for diverse applications.
Polarization-induced nonlinear spectrum modulation is a viable technique for advanced spectroscopic systems.