Abstract: A leak detection system comprising a substantially sealed accumulation chamber adapted to accommodate a single gas container, the accumulation chamber being sealed so that when a gas container is in the accumulation chamber gas leaked from that container accumulates. An optical detector is provided for detecting leaked gas, the detector including an optical cell. A controller directs a reference sample to the optical cell and subsequently directs a sample from the from the accumulation chamber to the optical cell. The optical detector is operable use both the reference sample and the accumulation chamber sample to detect leaked gas.

Abstract: A laser detection system comprises a plurality of lasers wherein each laser is configured to produce a respective laser beam for excitation of one or more different compounds, a sample cell for containing a volume of sample gas, at least one directing device configured to direct the laser beams to the sample cell, wherein the at least one directing device is configured to direct the laser beams along a common optical path to the sample cell, and a detector apparatus for detecting light output from the cell.

Abstract: A leak detection system for detecting leaks in pressurized containers, the system comprising a leak test conveyor for moving each container and an accumulation tunnel through which the leak test conveyer extends, wherein the accumulation tunnel and the leak test conveyer together define at least one enclosed accumulation volume, each enclosed accumulation volume being sized to accommodate only a single container, thereby to allow gas leaking from the single container to accumulate, and a gas sensor for sensing accumulated leaked gas from the single container.

Abstract: An optical cell comprises first and second opposed reflecting elements, an entrance aperture in the first reflecting element and an exit aperture in the second reflecting element, wherein the entrance and exit apertures are configured such that, in operation, light introduced into the cell via the entrance aperture is reflected at least once by the second reflecting element and at least once by the first reflecting element before leaving the cell via the exit aperture.

Abstract: A leak detection system for detecting leaks in pressurized containers, the system comprising a leak test conveyor for moving each container and an accumulation tunnel through which the leak test conveyer extends, wherein the accumulation tunnel and the leak test conveyer together define at least one enclosed accumulation volume, each enclosed accumulation volume being sized to accommodate only a single container, thereby to allow gas leaking from the single container to accumulate, and a gas sensor for sensing accumulated leaked gas from the single container.