Patent application number | Description | Published |
20080283752 | Electromagnetic Wave Sensor with Terahertz Bandwidth - The field of the invention is that of the detection of high frequency electromagnetic waves. The invention can be applied to a very wide range of bandwidths, but the preferred field of application is the terahertz frequency domain. The core of the detection device involves a so-called active material with an absorption coefficient in the optical domain that depends on the intensity of the terahertz signal to be detected. By measuring the variations of the absorption coefficient by means of an optical probe, the intensity of the terahertz signal is thus determined. By this means, a frequency translation is performed in a frequency domain where the measurement no longer poses technical problems. It is notably possible to improve the sensitivity of the detector by having antennas suited to the active medium, by using semiconductor or quantum well materials. In this case, it is also possible to produce a matrix or an array of terahertz sensors, thereby enabling either terahertz imaging or terahertz spectroscopy to be carried out. | 11-20-2008 |
20100039646 | POLARIMETRIC IMAGING SYSTEM HAVING A MATRIX OF PROGRAMMABLE WAVEPLATES BASED ON A MATERIAL WITH AN ISOTROPIC ELECTROOPTIC TENSOR - The subject of the invention is a polarimetric imaging system exhibiting an optical axis, and comprising means ( | 02-18-2010 |
20100039650 | Physical Value Sensor Comprising An Optical Fiber That Is Not Sensitive To Static Values - The subject of the present invention is a dynamic sensor of physical quantities with optical waveguide with optically-pumped amplifier medium, which requires no interferometer or reference sensor and which makes it possible to obtain at least the same level of performance, in terms of sensitivity, as known sensors of this type, and this waveguide is linked at one end to a selective mirror, and comprises at its other end an interrogation laser, the reflection of which on the selective mirror produces a wave which, by interference with the incident wave, provokes the periodic saturation of the gain of the waveguide. | 02-18-2010 |
20110019179 | Self-Referenced Optical Fiber Sensor and Related Sensor Network - The general field of the invention is that of fiber-optic sensors comprising at least one measurement optical fiber having an optically pumped doped amplifying medium, the optical characteristics of which are sensitive to a physical quantity, the fiber having at least one Bragg grating. The fiber is designed so as to generate, in the amplifying medium, two optical waves having different optical frequencies that propagate in the same direction after reflection on the Bragg grating and are emitted by the amplifying medium, the two optical frequencies depending on the physical quantity. The two waves may be generated using either a birefringent polarization-maintaining fiber or a DBR (Distributed Bragg Reflector) laser cavity. Notably, this sensor may be used as a hydrophone. | 01-27-2011 |
20110122417 | Self-Referenced Optical Fiber Sensor with Stimulated Brillouin Scattering - A sensor is used to measure a physical quantity and includes at least: a measurement optical fiber including at least one Bragg grating; optical means designed to inject, into the fiber, a first, “pump” wave at a first optical frequency and a second, “probe” wave at a second optical frequency, the second optical frequency being different from the first optical frequency, the Bragg grating being designed to reflect the first and second optical waves, and the optical power of the first wave being sufficient to give, after interaction with the second wave reflected by stimulated Brillouin scattering, a “Stokes” wave, the frequency of which is representative of the physical quantity to be measured; and means for analyzing the difference in frequency between the two, “pump” and “Stokes”, optical waves. The sensor may notably be used as a hydrophone. | 05-26-2011 |
20120183175 | METHOD FOR IDENTIFYING A SCENE FROM MULTIPLE WAVELENGTH POLARIZED IMAGES - Techniques for identifying images of a scene including illuminating the scene with a beam of 3 or more wavelengths, polarized according to a determined direction; simultaneously acquiring for each wavelength an image X | 07-19-2012 |
Patent application number | Description | Published |
20080252602 | DYNAMICALLY RECONFIGURABLE PIXEL ARRAY FOR OPTICAL NAVIGATION - Embodiments of an apparatus are described. In one embodiment, the apparatus is an optical navigation circuit. In particular, the optical navigation circuit may be part of an optical navigation device. The optical navigation circuit includes an image sensor, dynamic reconfiguration logic, and a digital signal processor. The image sensor includes a pixel array to generate a plurality of electrical signals corresponding to incident light at the pixel array. The dynamic reconfiguration logic is coupled to the image sensor. The dynamic reconfiguration logic is configured to receive the plurality of electrical signals from the pixel array and to generate a plurality of reconfigured electrical signals based on the plurality of electrical signals from the pixel array. The digital signal processor is coupled to the dynamic reconfiguration logic. The digital signal processor is configured to receive the plurality of reconfigured electrical signals from the dynamic reconfiguration logic. | 10-16-2008 |
20150071651 | MULTI-LEVEL CODING AND DISTORTION COMPENSATION - An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide receive and decode to the optical signals received from the transmitter. One or both of the receiver and transmitter are configured to compensate for non-idealities or non-linearities introduced into the communication system by optical components of the system. | 03-12-2015 |
20150071653 | MULTI-LEVEL DECODER WITH SKEW CORRECTION - An optical communication system, a transmitter, a receiver, and methods of operating the same are provided. In particular, a transmitter is disclosed as being configured to encode optical signals in accordance with a multi-level coding scheme. The receiver is configured to provide skew correction to the optical signals received from the transmitter by dividing a received signal into separate level-specific components and sampling each of the components with distinct sampling blocks. | 03-12-2015 |