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Gas analysis
Gas analysis has been applied in various places and for various purposes, such as measuring automobile emissions and monitoring flue gas emissions. In recent years, the applications of gas analysis have been expanding even further, with research being conducted into the early detection and diagnosis of diseases through the analysis of breath. Hamamatsu offers a wide range of light sources and detectors for optical gas measurement.
Lineup document "Devices for Gas Measurement"
Suitable light sources, detectors, and applications for each optical gas measurement method are introduced.
Features of optical gas measurement
Since each gas molecule has its own absorption wavelength, it is possible to measure the concentration of a gas by measuring the absorbance of light at that wavelength. Particularly in the infrared region, there are many absorption wavelengths specific to gas due to the vibration of gas molecules, so the infrared region is used for measuring various gasses.
For example, as shown in the figure, light is irradiated to a gas, and the absorbance is monitored by detecting the transmitted or reflected light. By selecting the optimal device with consideration for the light absorption characteristics of the target gas and its surrounding environment, an optical method can realize faster response, higher accuracy, and longer life than other methods for gas measurement.
High-speed response
The rapid response of optical sensor makes it suitable for real-time gas monitoring. It enables the higher accuracy measurement by integrating and averaging the large number of data even in a short measurement time.
High precision
Optical gas detection is less affected by coexisting gases and water vapor since it detects the specific absorption wavelength of each gas; high selective detection is performed with optical gas measurement.
Long life
Contactless detection with optical measurement contributes to make it robust system and less degradation of sensor itself. Moreover, the frequency of the maintenance can be done less often.
Measurement methods and application examples
NDIR
- Simple detection principle
- High reliability and maintainability
- High cost performance
Measurement CO2 concentration required for photosynthesis.
Gas leak detection at factories and other work sites.
FTIR
- Suitable for wide wavelengths
- Ideal for wide absorption band gases
- Measuring complex gases is possible
Concentration analysis of complex gas in automobile exhaust gas.
Analysis of complex gases emitted from factories and the like.
TDLAS
- Uses DFB semiconductor lasers
- High speed and high accuracy
- Applicable to isotope measurement field
Process control with real-time measurement of industrial gas.
Analysis of SOx and NOx in gases emitted from factories and the like.
DOAS
- Visible and ultraviolet light also available
- Optimal for measuring NOx and SOx
- Less affected by moisture
Real-time monitoring of automobile exhaust gas.
Analysis of pollutant gases in the atmosphere.
Absorption wavelengths of gases and compatible products
Recommended products
For NDIR
・Instantaneously high-peak output
・Low-heat generation
・Continuous spectrum: UV to MIR
・Supports 5 μm band
・Equipped with a band-pass filter supporting CO2 and CH4
For FTIR
・Supports 8 μm / 10 μm band
・Excellect linearity
・Supports 14 μm band
・Liquid nitrogen cooled type
・Excellent linearity
For TDLAS
・MIR semiconductor laser
・Distributed feedback structure
・Fast wavelength tuning by current modulation
・Supports 8 μm / 10 μm band
・Excellect linearity
・Supports 11 μm band
・High-speed response (DC to 100 MHz)
・Supports 5 μm / 8 μm / 11 μm band
・High-speed response (DC to 10 MHz)
For DOAS
・Instantaneously high-peak output
・Low-heat generation
・Continuous spectrum: UV to MIR
Related documents
- Confirmation
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