Alain Carapelle

Portable x-ray fluorescence spectrometer for coating thickness measurement

A handheld x-ray spectrometer has been realized and tested. The purpose of the device is to measure the thickness of coated samples in the range of 1-1500 nm in an industrial environment. Accuracy of approximately 3% has been achieved in this range with a measurement time of 1 min. Automated software has been implemented to allow utilization by a nonspecialist operator. An automated calibration procedure, based on measurements of reference samples, is used.

A STUDY OF VACUUM FREEZE-DRYING OF FROZEN WET PAPERS

Vacuum freeze-drying of frozen wet papers was investigated experimentally. A freeze-drying facility was built to study the process by monitoring the various physical parameters (pressure, sample temperature, heater temperature, water content of the sample and cold panel temperature). A simple phenomenological model was developed to explain experimental results. The values of the physical parameters were optimized to make the process cost effective.

Handheld modern computer brings new features to portable X-ray fluorescence coating thickness measurement device

Abstract X-ray fluorescence is routinely used to measure coating thickness on table top setup. The use of a handheld modern computer (PC compatible) gives the possibility to build a portable device with new features. The computer is used to control deviceʼs components and to do processor consuming calculation. The user interface is “push button” to allow the utilization by nonspecialized operator.

Holographic filter applied to LCD projector for improvement of laser pointer presentation

This paper presents the concept and feasibility demonstration of an improvement of the LCD projector optics. An innovative concept of integration of an holographic filter in the optical head allows for laser pointer tracking. The filter retrieves the positioning information of the pointer on a PSD (Position Sensitive Device). The detector is interfaced with the LCD matrix in order to project a pattern on the screen. Several software options can be implemented for remote control of the slide show. We present the holographic geometry optimization, the experimental recording, and results.