Long-Path Gas Cells

A long-path gas cell used to measure ppm-order or lower concentration gas samples, concentrations may range from the percent to ppb levels. Applications of the long-path gas cells include air pollution studies, gas purity determinations, monitoring of industrial processes, exhaust gas analysis and many others
These gas cells do not offer a long light path in a straight line. Rather, they comprise mirrors, and the long light path is achieved by repeated reflections within the gas cell.
Measuring low gas concentrations requires long optical paths in order to obtain satisfactory detection limits. For low quantities of gas or a high temporal resolution the volume of the measurement cell should be as small as possible. This is the only way to guarantee an efficient, rapid gas exchange.
These gas cells do not offer a long light path in a straight line. Rather, they comprise mirrors, and the long light path is achieved by repeated reflections within the gas cell.
Measuring low gas concentrations requires long optical paths in order to obtain satisfactory detection limits. For low quantities of gas or a high temporal resolution the volume of the measurement cell should be as small as possible. This is the only way to guarantee an efficient, rapid gas exchange.
Technical Data


