Related Experiment Video
Updated: Jul 14, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
[IR thermal-emitter based photoacoustic spectrometer for gas detection]
1Department of Physics, Dalian University of Technology, Dalian 116023, China.
Abstract:
An IR thermal-emitter based photoacoustic spectrometer for gas detection was developed. The function and structure of the hardware and the software for the spectrometer were presented. Based on the analysis of spectral characteristics of the IR source, the integrated absorption coefficients of absorption gases at different absorption bands were compared, thus the optimum parameters of the photoacoustic cell and the IR filters were determined. The experimental results showed that the detection limits of 1.6 x 10(-6), 4.5 x 10(-6) and 4.0 x 10(-4) for CO, NO and H2S gases could be obtained respectively. The repeatability and linearity were also tested for CO gas in the concentration range of 0-987 x 10(-6), and the results are fairly satisfactory. In addition, many other kinds of gases can be measured with the same spectrometer, simply by adding some corresponding IR filters.
Related Concept Videos
Gas Chromatography: Types of Detectors-II
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,...
Atomic Emission Spectroscopy: Instrumentation
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.
Flame Photometry: Overview
IR Spectrometers

