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Related Concept Videos

UV–Vis Spectrometers01:14

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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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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Related Experiment Video

Updated: Mar 15, 2026

Detection and Isolation of Circulating Melanoma Cells using Photoacoustic Flowmetry
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High-Flow-Rate Trace Formaldehyde Detection Based on Ultraviolet Photoacoustic Spectroscopy Using a Long Resonant

Qianjin Gan1, Zhongqi Feng2, Deng Zhang2

  • 1School of Optoelectronic Engineering, Xidian University, Xi'an 710071, China.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

A new ultraviolet photoacoustic spectroscopy (UV-PAS) system offers sensitive, stable, and real-time formaldehyde (H₂CO) detection. This advanced system overcomes limitations of traditional methods, enabling reliable monitoring even at high gas flow rates.

Keywords:
formaldehyde detectionhigh gas flow rateultraviolet photoacoustic spectroscopy

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Formaldehyde (H₂CO) is a hazardous volatile organic compound prevalent in indoor and industrial settings.
  • Real-time, sensitive detection of H₂CO is crucial for environmental safety.
  • Conventional photoacoustic spectroscopy (PAS) methods struggle with sensitivity, stability, and high flow rate operation.

Purpose of the Study:

  • To develop a novel ultraviolet photoacoustic spectroscopy (UV-PAS) system for formaldehyde detection.
  • To achieve high sensitivity and long-term stability in H₂CO monitoring.
  • To overcome the limitations of conventional PAS systems, particularly their dependence on low gas flow rates.

Main Methods:

  • Development of a UV-PAS system utilizing a 320 nm ultraviolet laser source.
  • Integration of a compact differential photoacoustic cell (PAC) optimized for acoustic resonance and flow disturbance suppression.
  • Operation in a nitrogen (N₂) background with careful optimization of resonator length and buffer configuration.

Main Results:

  • The UV-PAS system demonstrated stable photoacoustic response at a high flow rate of 250 sccm.
  • A resonant frequency of 1767 Hz and a quality factor of 46 were achieved for the photoacoustic cell.
  • A minimum detection limit of 2.50 ppm (1 s) and 88.1 ppb (2202 s) was determined, with a linear response (R² = 0.98844).

Conclusions:

  • The proposed UV-PAS system offers a sensitive, stable, and cost-effective solution for real-time trace formaldehyde detection.
  • The system exhibits robust performance at elevated gas flow rates, enhancing its practical applicability.
  • This technology holds significant potential for continuous online monitoring in environmental and industrial safety applications.