Today, the ever increasing number of controls in automobile and aviation cockpits leads to the
cluttering of various interfaces (keyboards, switches, panels, etc...). LCD touch screens have
proved to be a good alternative to reduce cluttering by reconfiguring in real time different
interfaces, appearing on demand as they are needed by the user. However, the underlying
screen still remains cumbersome and fragile glass device. We present a novel way to produce
virtual consoles and interfaces by projecting diffractive images and sensing the position of the
fingers by the use of IR diffractive optics.
White light scanning interference microscopy is used for measuring the surface morphology of materials and devices
more and more widely in many areas of research and industry. However, a limiting requirement is that the surface to be
analysed be kept static during measurement, which can typically take from several seconds to several minutes. As
industries such as MEMS manufacturing mature and create more complex dynamic devices, it becomes increasingly
important to be able to characterize structures that undergo periodic or transitory motion.
In this paper we present the architecture of a 4D (3D + time) interference microscopy system that is being developed
based on continuous fringe scanning over the depth of the sample. The simulation of results using real time detection of
the peak fringe intensity (PFSM, Peak Fringe Scanning Microscopy) or the maximum of the fringe visibility (FSA, Five
Sample Adaptative non linear algorithm) is discussed.
During scanning, a high speed CMOS camera provides images at a rate of 500 i/s (1280x1024 pixels) that are processed
using a FPGA (Field Programmable Gate Array) to extract the 4D measurements. At a bit stream rate of 625
Mbyte/second, it is reasonable to expect a measurement rate of nearly 1 i/s at full frame size over a 20 &mgr;m depth and 9 i/s
over a depth of 2 &mgr;m. By reducing the image size to 128x128 pixels, the rate is increased to 16 i/s over a 20 &mgr;m depth
and 600 i/s over 2 &mgr;m. These values could be increased further using under sampling or by means of higher speed reference mirror scanning.
We present an investigation that has been carried out on the design of a high speed scanning system for a data storage application. Polypeptide material is used to store data by the angular multiplexing process. This material presents many advantages compared with others. To address the optical memory, our set-up is composed of micro-scanning mirrors (MEMS) and an acousto-optic deflector (AOD). This association leads to an addressing set-up with a very good performance in terms of the access time and the angular bandwidth. Expermental tests made with micro-scanning mirrors (MEMS) of 3 x 3 mm2 are described. Problems fo synchronization between the different elements and the influences of MEMS deformation are also discussed.
We present the investigation which was conducted to improve the spatial and temporal performances of a deflecting system for display addressing. In a first part we describe the operation principle used to increase the optical deflection angle of an acousto-optic deflector. We show that it is possible to obtain an angular amplification simply by using a grating at grazing incidence angle; the diffraction is then close to 90 degrees. Experimental tests made with a 1200 gr/mm grating have shown that an amplification of the deflection angle as high as 10 can be obtained. In a second part we introduce a complete set-up composed by the association of MEMS, Acousto-optic and grating. All those components are used to achieve a compact addressing system.
Conference Committee Involvement (1)
Photonics in the Transportation Industry: Auto to Aerospace III