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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.
New products for gas measurement
A mid-infrared LED with a peak emission wavelength of 3.3 µm that achieves narrower directivity and higher output power with a reflector. Peak emission wavelengths of 3.9 μm and 4.3 μm are also available.
Back-illuminated InAsSb photovoltaic detector (TO-46 package) with high sensitivity in the spectral band up to 5 μm. We greatly improved the sensitivity temperature coefficient.
Back-illuminated InAsSb photovoltaic detector (ceramic package) with high sensitivity in the spectral band up to 5 μm. We greatly improved the sensitivity temperature coefficient.
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.
Features
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 method and application examples
NDIR (Non-dispersive infrared)
- Simple detection principle
- High reliability and superior maintainability
- High cost performance
Measuring CO2 concentration required for photosynthesis.
Gas leak detection at factories and other work sites.
FTIR (Fourier transform infrared spectroscopy)
- Wideband spectral information can be obtained
- Suitable for measuring gases with a wide absorption band
- Measurement of complex gases is also possible
Concentration analysis of complex gas in automobile exhaust gas.
Analysis of complex gases emitted from factories and the like.
TDLAS (Tunable diode laser absorption spectroscopy)
- Use of Distributed-feedback (DFB) semiconductor laser
- High speed and high accuracy measurement is possible
- Applicable in the field of isotope measurement
Process control with real-time measurement of industrial gas.
Analysis of complex gases emitted from factories and the like.
DOAS (Differential optical absorption spectroscopy)
- 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.
Line-up document "Devices for Gas Measurement" is now available!
Hamamatsu offers a wide range of light sources and detectors required for optical gas measurement. This document introduces suitable products and application examples for each measurement method.
Absorption wavelengths of gases and compatible products
Absorption wavelengths of various gases such as carbon dioxide (CO2) and methane (CH4), and emission/absorption wavelength ranges of Hamamatsu gas measurement devices are introduced.
Recommended products
| Product image | Product name | Features | NDIR | FTIR | TDLAS | DOAS | |
|---|---|---|---|---|---|---|---|
| Light sources |  |
Mid infrared LEDs |
・Peak emission wavelengths: 3.3 μm, 3.9 μm, 4.3 μm ・Suitable for measuring CO2, CH4 |
✓ | |||
 |
Xenon flash lamps |
・Instanteneously high peak output ・Low heat generation ・Continuous spectrum |
✓ | ✓ | |||
 |
CW Quantum cascade lasers |
・MIR semiconductor laser ・Fabricated Distributed-feedback (DFB) structure ・Fast wavelength tuning by current modulation |
✓ | ||||
 |
Xenon lamps |
・High stability ・Continuous spectrum |
✓ | ||||
 |
Deuterium lamps |
・High stability ・Long life ・Continuous spectrum in UV range |
✓ | ||||
| Detectors |  |
InAsSb photovoltaic detectors |
・Supports 5 μm band ・Available with a bandpass filter for CO2, CH4 |
✓ | |||
 |
InAsSb photovoltaic detectors |
・Supports 8 μm and 10 μm bands ・Non-cooled types and TE-cooled types are available |
✓ | ✓ | |||
 |
TypeⅡsuperlattice infrared detector |
・Supports 14 μm band ・Liquid nitrogen cooled type ・Excellent linearity |
✓ | ||||
 |
Infrared detector modules with preamplifier |
・Supports 10 μm band ・High-speed response ・Non-cooled types and TE-cooled types are available |
✓ | ✓ | ✓ |
Related documents
- Confirmation
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