Laser sensor for detection gases in the air

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Laser sensor for detection gases in the air

Laser techniques are particularly attractive tool for industrial gas detection systems. They allow fast, selective and remote detection, which is desirable especially in safety and industrial applications.
Typical systems for remote detection of gas in the air, allow the detection of path-integrated gas concentration in the desired direction. Exact location of the gas in the space is possible in the case where the light returning to a measuring system is the light scattered from the particles floating in the air. This type of arrangement, usually referred to as LIDAR (Light Detection and Ranging), has some limitations, such as low spatial resolution, low sensitivity, complexity and large size of the detection system. The need for a method of remote and selective measurement of gas concentrations with clearly defined spatial locations in a compact form and not requiring the use of complex algorithms for data processing was the main motivation for our work.

Our offer is a method for detection and spatial location of gas, including the system implementing the developed solution. The invention allows for the simultaneous, selective detection of gas and its spatial location in the air, in remote and standoff configuration.

In the offered embodiment for quantitative gas detection the two laser beams are used, and the spatial location is possible, since the useful signal is formed only at the point of their intersection. Proper control of the position of light beams, allows for the simultaneous detection and location of gas without having to apply complex and large-size optical systems, expensive detecting components (eg. such as avalanche photodiodes) or complex data processing algorithms.

The proposed solution can be used in detecting the presence of gases in the air. In the case of the detection of gas leaks, it allows the determination of the leak position, which is important especially in the case of hazardous gas detection (toxic or explosive). There are also other industrial applications, including measurements of the concentration profiles of selected molecules in the exhaust gases (eg. from engines).

Posted by Agata Kołacz, Posted on 23.05.2016