Absorption studies and minimum detectable concentration of ethylene by using a room-temperature HgCdTe detector

Area of Science:

• Environmental Science
• Materials Science
• Optical Engineering

Background:

• Mercury Cadmium Telluride (HgCdTe) detectors are crucial for infrared sensing.
• Traditional HgCdTe detectors often require cryogenic cooling, increasing system complexity and cost.
• Developing room-temperature detectors is essential for portable and cost-effective environmental monitoring solutions.

Purpose of the Study:

• To investigate the performance of a room-temperature HgCdTe detector for air pollution detection.
• To evaluate the feasibility of using a simple system with a carbon dioxide (CO2) laser.
• To determine the detector's sensitivity and operational frequency range.

Main Methods:

• Utilized a simple air pollution detection system.
• Employed a carbon dioxide (CO2) laser source.
• Tested a room-temperature HgCdTe detector.
• Measured detector responsivity across a frequency range of 200-400 Hz.
• Determined the minimum detectable concentration of ethylene.

Main Results:

• The HgCdTe detector exhibited flat responsivity between 200-400 Hz.
• The minimum detectable concentration of ethylene was approximately 2 parts per million-meter (ppm-m).
• The achieved sensitivity is comparable to that of liquid-nitrogen-cooled HgCdTe detectors.

Conclusions:

• Room-temperature HgCdTe detectors are viable for simple air pollution monitoring systems.
• The system demonstrates effective ethylene detection capabilities.
• This technology offers a cost-effective alternative to cooled detector systems for environmental sensing.