Tunable Diode Laser Spectroscopy Gas Measurement that is Free from Interference

 Laser-based spectroscopic sensors as gas measurement instruments such as those found in CD players are based on the absorption of light in the near-infrared region of the spectrum. The unique light source is tunable diode laser that can be calibrated to detect a particular gas to gain measurements that are free from any interference from either objects or other gases. Tunable diode laser spectroscopy has lasers adapted to the spectroscopic detection of gases, measurements of the properties of gas flows and remote monitoring of chemicals. The use of lasers to measure the properties or quantity of trace gases, liquids and solids is a fundamental technology base used in many industrial and commercial applications.

Laser gas detection of ch4 greenhouse gas emissions

Methane (ch4) is a potent greenhouse gas which is about 25 times stronger than carbon dioxide. Large quantities of methane are produced in agricultural and livestock operations. Laser gas detection using tunable diode laser spectroscopy provides the solution for gas monitoring in order to comply with environmental regulations. Laser technology is an alternative solution to traditional detection techniques. Laser gas detection provides excellent target gas selectivity, calibration-free operation and ppm-level detection of greenhouse gases that are precursors to acidification and ground-level ozone.

Monitoring nh3 emissions in livestock operations

Livestock operations are significant contributors of ammonia emissions which can be a hazard to workers and the residents in the nearby environment. Because of its properties of acidification, eutrophication and ground-level generation of ozone, ammonia emissions need to be reduced according to legal regulations in maintaining good quality air in the environment. Farmers are required to install ammonia scrubbers in livestock operations to reduce the ammonia emissions. Ventilation control also needs to be optimized as well as gas detection equipment to measure nh3 concentrations. Tunable diode laser spectroscopy provides the solution to the challenge faced by farmers for continuous nh3 measurements.

Advantages of the tunable diode laser spectroscopy

  • Extremely high selectivity in the target area
  • Functional safety and continuous status reporting
  • Long lifetime usually more than 10 years
  • Fast response times that can avert an emergency situation
  • Low power consumption
  • No calibration requirements
  • Low cost of the laser-based sensor

For industrial applications, it is particularly crucial to avoid costly false alarms and un-noticed sensor failure. Developments in laser and optics technology it is now possible to carry out fast readings at specified intervals to enable the manufacturer to keep the gas emissions within the government mandated regulations. The tunable diode laser spectroscopy aids the manufacturing process by maximizing efficiency particularly when gases like nh3 are analyzed. For environmental applications, laser gas detection provides outstanding value both for the end-user and the system integrator. Not only does the laser gas detection cover a broad range of gas monitoring but it includes detection for combustion control, leak control, process control, climate monitoring and safety. Unlike other electrochemical detectors, tunable diode laser spectroscopy does not degrade overtime. It can be an important support from concept to volume production. 

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