Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

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...

Gas Chromatography: Types of Detectors-I

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...

Gas Chromatography: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...

Thermometers and Temperature Scales

Thermometers and Temperature Scales

Any physical property that depends consistently and reproducibly on temperature can be used as the basis of a thermometer. For example, volume increases with temperature for most substances. This property is the basis for the common alcohol thermometer and the original mercury thermometers. Other properties used to measure temperature include electrical resistance, color, and the emission of infrared radiation.
As many physical properties depend on temperature, the variety of thermometers is...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

Temperature Measurement Sites

Temperature Measurement Sites

A thermometer measures body temperature. The common sites for measuring body temperature are the oral cavity, axillary region, temporal artery, and skin surface, such as the forehead, abdomen, and axilla. True core body temperature is assessed in the rectum, tympanic membrane, pulmonary artery, esophagus, and urinary bladder.
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Eagle syndrome: revealed by the background disease.

QJM : monthly journal of the Association of Physicians·2024

Same author

Two definitions of presenteeism: sickness presenteeism and impaired work function.

Occupational medicine (Oxford, England)·2020

Same author

Corrigendum to "Familial primary localized cutaneous amyloidosis in a Japanese family" [J. Dermatol. Sci. 83 (2016) 162-164].

Journal of dermatological science·2017

Same author

Interleukin-10 is differentially expressed in the small intestine and the colon experiencing chronic inflammation and ulcerative colitis induced by dextran sodium sulfate in young pigs.

Physiological research·2016

Same author

Consumption of guar gum and retrograded high-amylose corn resistant starch increases IL-10 abundance without affecting pro-inflammatory cytokines in the colon of pigs fed a high-fat diet.

Journal of animal science·2013

Same author

The small intestinal apical hydrolase activities are decreased in the piglet with bowel inflammation induced by dextran sodium sulfate.

Journal of animal science·2013

Search research articles

Related Experiment Video

Updated: Jul 7, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Room-temperature mid-infrared laser sensor for trace gas detection.

T Töpfer, K P Petrov, Y Mine

|February 12, 2008

Summary

A new portable, room-temperature mid-infrared gas sensor uses difference-frequency generation (DFG) for high-precision CO detection. This compact device achieves 1 ppb precision, paving the way for versatile trace gas analysis.

More Related Videos

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Related Experiment Videos

Last Updated: Jul 7, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Area of Science:

Spectroscopy
Laser Technology
Environmental Monitoring

Background:

Mid-infrared gas sensing is crucial for environmental and industrial applications.
Existing sensors often require complex cooling or are not portable.
Difference-frequency generation (DFG) offers a tunable and precise method for gas detection.

Purpose of the Study:

To design and demonstrate a compact, portable, room-temperature mid-infrared gas sensor.
To achieve high-precision detection of carbon monoxide (CO) in ambient air.
To explore the potential for detecting other trace gases using this technology.

Main Methods:

Utilized continuous-wave difference-frequency generation (DFG) in periodically poled lithium niobate.
Employed a GaAlAs diode laser and a diode-pumped Nd:YAG laser as pump sources.
Integrated a compact multipass absorption cell (18-m path length) and a HgCdTe detector.

Main Results:

Achieved 1 ppb (parts in 10^9) precision for CO detection in air at atmospheric pressure.
Demonstrated 0.6% accuracy with a 10-second signal averaging time.
Identified residual interference fringes as the main limitation to precision.

Conclusions:

This work presents the first portable, room-temperature DFG-based gas sensor.
The sensor design shows promise for detecting various trace gases (N2O, CO2, SO2, H2CO, CH4) with tunable lasers.
Further development could overcome fringe limitations for even greater precision.