Abstract: Gas detection or monitoring apparatus mainly comprising, an optical source unit including a tunable diode laser, an optical detection unit including a light sensitive detector, the source and the detector being arranged so that light from the source propagates through a gas measurement volume prior to being received by the detector, and the source being adapted to scan the light wavelength across one or more expected absorption lines of gases in the measurement volume, a control and processing unit for control and modulation of the source and processing of the detected signal and for calculating at least one digital value representing (a) gas concentrations in the gas measurement volume, wherein said control and processing unit is coupled to the source via a digital-to-analogue (D/A) converter, and the detector output signal is coupled to the input of an analogue-to-digital (A/D) converter, and the output of the A/D converter is coupled to the processing unit.

Abstract: Apparatus and method for optical inspection of a pipeline (2) for transporting fluid (3) by internal surveying. Light source means (4) are adapted to form one or more beams of light (5) illuminating a line (L) of a surface part (9) of said pipeline (2). Optical receiving means (6) are positioned outside a plane formed by said beams (5) and arranged to have in its field of view (7) the line (L) formed on the internal wall of the pipeline (2) by the beam (5). The receiving means (6) are adapted to form a two-dimensional indexed images (20k) each comprising intensity data for a predetermined number of pixels in each of a predetermined number of lines (M) of said image (20). A data processing unit (100) including an image analyzer module (110) is adapted for extracting a depth profile of said surface (9).

Abstract: Apparatus and method for optical inspection of a pipeline (2) for transporting fluid (3) by internal surveying. Light source means (4) are adapted to form one or more beams of light (5) illuminating a line (L) of a surface part (9) of said pipeline (2). Optical receiving means (6) are positioned outside a plane formed by said beams (5) and arranged to have in its field of view (7) the line (L) formed on the internal wall of the pipeline (2) by the beam (5). The receiving means (S) are adapted to form a two-dimensional indexed images (20k) each comprising intensity data for a predetermined number of pixels in each of a predetermined number of lines (M) of said image (20). A data processing unit (100) including an image analyzer module (110) is adapted for extracting a depth profile of said surface (9).