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Gas analyzer

Gas analyzer

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.

Many gases have absorption wavelengths in the near- and mid-infrared (NIR and MIR) region, attributed to the vibration of gas molecules. We offer light sources and detectors for detecting and measuring the concentration of gases.

Light sources

Mid Infrared LED (MWIR-LED)

  • Wavelength: 3.3 μm (CH₄), 3.9 μm (reference light), and 4.3 μm (CO₂) are provided.
  • Higher output, higher reliability, lower power consumption, faster response than lamps

→ For relatively simple sensors

Quantum Cascade Laser (QCL)

  • Wavelength:4 μm to 10 μm band
  • High resolution, high output, high reliability, high-speed response

→ For minute, high accuracy gas detection

Xenon Flash Lamp (Xe-F)

  • Wavelength: 0.2 μm to 5.0 μm (continuous spectrum)
  • High output pulse emission in the microsecond order
  • Long life

→ For multiple gas detection

Light source Wavelength range Output Time response characteristics Power consumption Lifetime Price
MWIR-LED Narrow ☆☆ ☆☆☆ ☆☆☆ ☆☆☆ ☆☆☆
QCL Line spectrum ☆☆☆☆ ☆☆☆ ☆☆ ☆☆
Xe-F Wide ☆☆☆☆ ☆☆ ☆☆ ☆☆
Filament Lamp Wide ☆☆☆ ☆☆ ☆☆☆☆

Detectors

InAsSb Photovoltaic Detector (quantum type detector)

  • High sensitivity, high-speed response

→ For relatively simple sensor Used in pairs with an LED
→ For applications that require relatively high accuracy Used in pairs a QCL

Thermopile (thermal type detector)

  • Covers a wide wavelength range, inexpensive
  • Can support band-pass filters for CH₄, CO₂, and reference light

→ For relatively low-end applications

Detector Sensitivity Wavelength dependence Time response characteristics Cooling Price
Quantum type ☆☆☆ Yes ☆☆☆ Cooling (partially not required) ☆☆
Thermal type ☆☆ None ☆☆ Non-cooled ☆☆☆

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