Abstract: A group and method for measuring the pressure in closed containers made from optically transparent material at least at a portion of a top space without contacting the containers, and a filling and/or packaging plant using the measuring group. The measuring group comprises an inspection area; a laser source with optical axis for the emission of a laser beam at a wavelength tunable with an absorption wavelength of a gas contained in a container top space; at least one detector to detect the laser beam once it has travelled through the inspection area to provide an absorption spectrum of said gas; a device for detecting the signal acquisition time period corresponding to the passage of a top space through the inspection area; having means for identifying signal contributions useful for the pressure measurement amongst the data representative of an absorption spectrum acquired during the signal acquisition time period.

Abstract: A Cartesian numerically controlled machine tool for high-precision machining includes a footing, a first part with first movement elements for the movement of a second part with respect to a first controlled axis, a second part with second movement elements for the movement of a third part with respect to a second controlled axis, and a third part with third movement elements for the movement of a machining head with respect to a third controlled axis. The Cartesian machine tool further includes a machining head, and, on board, optical elements for detecting and monitoring the position of at least one reference nodal point for each of one or more of the controlled axes with respect to a reference that is integral with a part of the machine tool.

Abstract: The present invention concerns a group (10) and method for measuring the pressure in closed containers (30) made from optically transparent material at least at a portion of a top space (31) thereof, and a filling and/or packaging plant (100) using the measuring group. In particular the present invention concerns a group and a method for contactlessly measuring the pressure in closed containers, able to be used directly in automatic filling and/or packaging plants operating at high speed, without the need to stop or slow down such plants or in any case to pick up the containers from the same.

Abstract: The device comprises a laser source which emits a beam of a predetermined wavelength towards an optically transparent closed container and detectors arranged to detect the laser beam which is attenuated by the gas absorption. The detectors provide the first data of absorption representative of a first absorption spectrum of the gas including distorted absorption lines and noise. The invention implements a method of calculation aimed at receiving and elaborating said first data. The output of the operation are parameters that represent a second absorption spectrum free of noise and distortion in the absorption lines. From these parameters we are able to determine the gas pressure and concentration in the container.

Abstract: The device comprises a laser source which emits a beam of a predetermined wavelength towards an optically transparent closed container and detectors arranged to detect the laser beam which is attenuated by the gas absorption. The detectors provide the first data of absorption representative of a first absorption spectrum of the gas including distorted absorption lines and noise. The invention implements a method of calculation aimed at receiving and elaborating said first data. The output of the operation are parameters that represent a second absorption spectrum free of noise and distortion in the absorption lines. From these parameters we are able to determine the gas pressure and concentration in the container.