Gas analysis

Gas analysis is used in many fields including environmental monitoring, process control, energy, and health. Gas analysis based on the absorption of gases at specific wavelengths (UV/Visible and infrared) has advantages over other methods, such as non-contact measurement and high selectivity. The absorption-based gas analyzers require a light source and detector, and Hamamatsu offers many choices of both.


Mid-infrared region (approx. 3 - 10 μm)


Many gases have absorption wavelengths in the mid-infrared (MIR) region, which are attributed to the vibrations of the gas molecule. We offer light sources and detectors for detecting and measuring the concentration of MIR-active gases.



Example gases and other molecules with absorption wavelengths in the 3 – 10 μm spectral range


Near-infrared region (approx. 0.8 - 3 μm)


Some gases have absorption wavelengths in the near-infrared (NIR) region, which are attributed to the vibrations of the gas molecule. We offer light sources and detectors for detecting and measuring the concentration of NIR-active gases.



Example gases and other molecules with absorption wavelengths in the 0.8 - 3 μm spectral range



Hamamatsu light sources and detectors for gas measurement and analysis


Light sources

Quantum cascade lasers (QCL)
Single-wavelength emission within 4 – 10 μm


QCLs have a narrow emission range and are suitable light sources for high-accuracy detection of gases such as COx, NOx, SOx, CH4, NH3, and O3 down to ppb (parts per billion) levels. They can also be used for measuring isotopes of carbon dioxide (13CO2/12CO2) and methane (12CH4/13CH4). Our QCLs feature high output, high reliability, and high-speed response.


See QCLs


Mid-infrared LEDs
Narrow spectral emission within 3 - 4.3 μm


Our mid-infrared LEDs are suitable light sources for relatively simple gas sensors with ppm (parts per million) sensitivity. We offer MIR LEDs that emit at 3.3 μm for CH4 detection, 3.9 μm for reference, and 4.3 μm for CO2 detection. Other features include high output, high reliability, low power consumption, and faster response than lamps.


See LEDs for gas analysis


Near-infrared LEDs
Narrow spectral emission at 1.2 μm or 1.55 μm


Our near-infrared LEDs are suitable light sources for relatively simple gas sensors with ppm (parts per million) sensitivity. Our LED lineup has emission at 1.2 μm and 1.55 μm. Other features include high output, high reliability, low power consumption, and faster response than lamps.


See LEDs for gas analysis


Xenon flash lamps
Pulsed light emission within 0.16 – 5 μm


Xenon flash lamps have a broad emission wavelength range, so they are suitable light sources for gas sensors that detect multiple gases with ppm (parts per million) sensitivity. Features include high output pulsed emission, high-speed response, long life, and high stability.


See xenon flash lamps


Xenon lamps
Broad spectral emission within 0.185 – 2 μm


Xenon lamps have a broad emission wavelength range, so they are suitable light sources for gas sensors that detect multiple gases. Our xenon lamps feature high stability and a long life.


See xenon lamps


Detectors

InAsSb photovoltaic detectors
Spectral response range within 1 - 11 μm


Indium arsenide antimonide (InAsSb) detectors can be paired with QCLs or mid-infrared LEDs to detect gases in the mid-infrared wavelength range. Unlike MCT (mercury cadmium telluride) detectors, InAsSb detectors are RoHS compliant and have highly stable characteristics and minimal variations from detector to detector.


See InAsSb detectors


Thermopiles
Spectral response range within 3 - 5 μm


Thermopiles are suitable for relatively simple gas sensors with ppm (parts per million) sensitivity. Our thermopile lineup offers sensitivity to the 3 – 5 μm wavelength band. These detectors operate at room temperature and are less expensive than photovoltaic or photoconductive detectors.


See thermopiles


InSb photoconductive detectors
Spectral response range within 1 – 6.7 μm


Indium antimonide (InSb) photoconductive detectors are sensitive to the 3 - 6 μm wavelength band. Our InSb photoconductive detectors are TE-cooled.


See InSb photoconductive detectors


InSb photovoltaic detectors
Spectral response range within 1 – 5.5 μm


Indium antimonide (InSb) photovoltaic detectors have high-speed response and high sensitivity in the 3 – 5 μm wavelength band. Our InSb photovoltaic detectors are deep-cooled with liquid nitrogen, offering high sensitivity and low noise.


See InSb photovoltaic detectors


InGaAs PIN photodiodes (long wavelength type)
Cutoff wavelength: approx. 1.9 μm, 2.1 μm, 2.6 μm


Indium gallium arsenide (InGaAs) PIN photodiodes are suitable for gas sensors operating in the near-infrared region. Our InGaAs PIN photodiodes feature high sensitivity, low noise, high-speed response, and high reliability.


Product lineup:

See InGaAs PIN photodiodes (long wavelength type)


InAs photovoltaic detectors
Spectral response range within 1 - 3.6 μm


Indium arsenide (InAs) photovoltaic detectors are sensitive to near-infrared wavelengths from approximately 1 μm to 3.6 μm. Their features include low noise, high sensitivity, high-speed response, and high reliability.


See InAs photovoltaic detectors


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