摘要:
The invention relates to an information carrier, and a system for positioning such an information carrier in an apparatus. This system comprises an optical element (102) for generating a periodic array of light spots (103) intended to be applied to an information carrier (101), said information carrier (101) comprising a first periodic structure (108) intended to interfere with said periodic array of light spots (103) for generating a first Moiré pattern, and a second periodic structure (109) intended to interfere with said periodic array of light spots (103) for generating a second Moiré pattern, analysis means for deriving from said first and second Moiré patterns, the angle value (S) between said periodic array of light spots (103) and said information carrier (101), and actuation means (AC1-AC2-AC3) for adjusting the angular position of said information carrier (101) with respect to said array of light spots (103), from control signals (114) derived based on said angle value (S).
摘要:
The invention relates to an information carrier (101) intended to be read and/or written by a periodic array of light spots, said information carrier (101) comprising a data area (105) defined by a set of elementary data areas, a first periodic structure (108) intended to interfere with said periodic array of light spots for generating a first moiré pattern, a second periodic structure (109) intended to interfere with said periodic array of light spots for generating a second moiré pattern, said second periodic structure (109) being arranged perpendicularly to said first periodic structure (108). The invention also relates to an apparatus for reading and/or writing said information carrier (101).
摘要:
The invention relates to a system for reading data stored on an information carrier (201), said system comprising: an optical element (202) for generating an array of light spots (203) from an input light beam (204), said array of light spots (203) being intended to scan said information carrier (201), a detector (205) for detecting said data from an array of output light beams generated by said information carrier (201) in response of said array of light spots (203). Use: Optical storage
摘要:
The present invention provides a spectroscopic system and a transmission based imaging system for a spectroscopic system as well as a probe head for a transmission based imaging system for a spectroscopic system and a corresponding transmission based imaging method. The spectroscopic system is preferably applicable to in vivo noninvasive blood analysis. Transmission based imaging makes use of a transmitted portion of an imaging or monitoring beam that has been transmitted through biological tissue. By means of transmission based imaging, a contrast decreasing impact of scattered radiation can be effectively reduced. Additionally, by arranging the imaging light source opposite to an objective lens of the spectroscopic system, unintended propagation of spectroscopic excitation radiation into free space can be effectively prevented.
摘要:
The present invention relates to a system for copy protection of an information carrier, said system comprising a diffractive layer for delivering a speckle pattern when illuminated by a light source, a spatial filter, which is aligned with respect to the diffractive layer, for delivering a filtered optical signal from the speckle pattern and a detector array for delivering, when illuminated by said filtered optical signal, an electrical signal. Said system further comprises means for computing a cryptographic key from the electrical signal, and means for decrypting encrypted data contained in the information carrier from the cryptographic key. It finds its application in copy protection of content carriers such as optical discs or in smart cards.
摘要:
The optical analysis system (1) is arranged to determine an amplitude of a principal component of an optical signal. The optical analysis system (1) comprises a first detector (5) for detecting the optical signal weighted by a first spectral weighting function, and a second detector (6) for detecting the optical signal weighted by a second spectral weighting function. For an improved signal-to-noise ratio, the optical analysis system (1) further comprises a dispersive element (2) for spectrally dispersing the optical signal, and a distribution element (4) for receiving the spectrally dispersed optical signal and for distributing a first part of the optical signal weighted by the first spectral weighting function to the first detector (5) and a second part of the optical signal weighted by the second spectral weighting function to the second detector (6). The spectroscopic analysis system (30) and the blood analysis system (40) each comprise an optical analysis system (1) according to the invention.
摘要:
The invention relates to a system for shifting at least one light spot (903), said system comprising: —a phase-modulator (906) for generating, from an input light beam, a light beam which is phase-modulated according to a controllable phase profile, —an array of apertures (902) for generating said at least one light spot (903) from said phase-modulated light beam, a change of the phase profile implying a shift of said at least one light spot (903). Use: Optical storage
摘要:
For displaying a target image contained in a sequence of first images (11) interspersed with second images (12) constituting a masking image, a display device is arranged for substantially exclusively displaying the first images and suppressing the second images in response to a key (13). The display device may be provided with an LCD screen which is only illuminated when first images are displayed. Color coding may be used to further enhance the security of the device.
摘要:
An optical scanning device (1; 100) for scanning an information layer (4) of an optical record carrier (2; 102). The device comprises a radiation source (11; 111) for generating a radiation beam (12, 15, 20; 112, 115, 120), an objective system (18; 118) for converging the radiation beam on the information layer (4), and an optical filter (200) for regulating the intensity profile of the radiation beam. The filter has an optical axis (119) and comprises a saturable absorber (206) having an absorption that saturates at a threshold incident radiation intensity. For incident radiation beams of intensity less than the threshold, the absorption of the absorber decreases with distance away from the axis.
摘要:
In known single probe scanning X-ray microscopes a very thin X-ray beam is selected from X-rays generated by an X-ray source. This known technique has the drawback that very few photons only take part in irradiating the sample. Therefore, high intensity sources have to be used, such as very big and expensive synchrotron sources, or very long exposure times (100 hours) have to be accepted. According to the invention it is proposed to irradiate the sample (10) by means of radiation which is selected from the source X-ray beam (4) by means of a lattice plate (6), thus providing a plurality of N probe-forming X-ray beams selected from the main beam (4). This results in an improvement of the exposure time by a factor of N.