Related Experiment Video
Updated: Jun 15, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
High sensitivity point monitoring of atmospheric gases employing tunable diode lasers
Abstract:
A laser absorption spectrometer is described which employs a wavelength tunable diode laser in conjunction with a multipass White cell. The instrument is sensitive to absorption coefficients as low as 3 x 10(-8) m(-1) and is designed for use as a portable pollution monitor. The performance of the instrument is illustrated by describing the measurement of three gases commonly found in the atmosphere: SO(2) and N(2)O with sensitivities of 1 ppb and NH(3) with a sensitivity of better than 0.1 ppb. The linearity of response and calibration of the instrument are also discussed in some detail.
More Related Videos
Related Concept Videos
Gas Chromatography: Types of Detectors-II
Gas Chromatography: Overview of Detectors
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
Gas Chromatography: Types of Detectors-I
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,...
High-Performance Liquid Chromatography: Types of Detectors
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
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.

