Abstract: The present invention pertains to a device for controlling a gaseous mixture comprised in a portable enclosure as well as an enclosure comprising such device and a monitoring system comprising at least one corresponding enclosure. Accordingly, a device (1) for controlling a gaseous mixture (2) comprised in a portable enclosure (10) is suggested, which comprises a gas delivery device (3) for the delivery of at least one gaseous component (20, 22) to the gaseous mixture (2) and/or a gas removal device (4) for the removal of at least one gaseous component (20, 22) from the gaseous mixture (2), a gas monitor device (5) configured to detect at least one parameter (50) relating to the gaseous mixture (2), and a control unit (6) in communication with the gas monitor device (5) to receive the detected parameter and configured to determine an information (60) relating to the gaseous mixture (2) based on the received parameter (50).

Abstract: Contaminants are detected optically at concentrations below 1 part-per-million (ppm) and extending to a level approaching 1 part-per-trillion (ppt) by using intracavity laser spectroscopy (ILS) techniques. A solid-state laser with an ion-doped crystal medium contained in an optical resonator cavity (the ILS laser) is employed as a detector. A gas sample containing gaseous contaminant species is placed inside the optical resonator cavity and on one side of the ion-doped crystal. The output signal from the ILS laser is detected and analyzed to identify the gaseous species. The concentration of the gaseous species can be determined as well.