Class / Patent application number | Description | Number of patent applications / Date published |
356400090 | Of light interference fringes | 17 |
20110273699 | Chirped Coherent Laser Radar System and Method - A laser radar system using collocated laser beams to unambiguously detects a range of a target and a range rate at which the target is moving relative to the laser radar system. Another aspect of various embodiments of the invention may relate to a laser radar system that uses multiple laser radar sections to obtain multiple simultaneous measurements (or substantially so), whereby both range and range rate can be determined without various temporal effects introduced by systems employing single laser sections taking sequential measurements. In addition, other aspects of various embodiments of the invention may enable faster determination of the range and rate of the target, a more accurate determination of the range and rate of the target, and/or may provide other advantages. | 11-10-2011 |
20120105822 | Super resolution telescope - A super-resolution telescope. A target is illuminated with at least three laser beams, each beam having a slightly different frequency so as to produce an illumination pattern comprised of several sets of straight interference fringes which sweep across the target. The frequencies of the illumination beams are chosen so that each pair of beams has a unique beat frequency, and the corresponding fringe pattern for each pair sweeps over the target at a unique speed. By collecting a series of images, and demodulating them at the various beat frequencies, the downshifted spatial frequencies can be identified, correctly up-shifted, and fitted together with a set of special Fourier transform based algorithms to reconstruct high-resolution images. Applicants have performed laboratory experiments that this invention can provide resolution substantially better than diffraction limited resolution. | 05-03-2012 |
20120176595 | METHOD OF OPERATING A SMI SENSOR AND CORRESPONDING SENSOR DEVICE - The present invention refers to a method of operating a self-mixing interference sensor and a corresponding self-mixing interference sensor device. In the method the laser ( | 07-12-2012 |
20130044309 | Scanning Non-Scanning LIDAR - An all fiber optic laser based scanning system for real time terrain mapping under degraded visual conditions is disclosed. A laser output is modulated to achieve a desired pulse width and pulse repetition frequency (PRF) and the modulated signal is amplified. The amplified optical signals are split into N channels that correspond to N elements of an optically phased array that steers light by modulating the phase of light entering and exiting the optical system. By applying a linear phase shift across the beam's wave front, the light propagating along the system's optical axis is steered to an off-axis angle. A real time map of an underlying terrain is accomplished by sweeping the N channel array across the terrain while collecting range information from each scan grid. | 02-21-2013 |
20130107242 | MEASUREMENT APPARATUS | 05-02-2013 |
20130222785 | MEASUREMENT APPARATUS AND METHOD OF MANUFACTURING ARTICLE - The present invention provides a measurement apparatus including a phase detection unit configured to detect, from interfering light of light reflected by a reference surface and light reflected by a test surface, a phase corresponding to an optical path length between the reference surface and the test surface, a refractive index detection unit configured to detect a refractive index of a space between the reference surface and the test surface, and a processing unit configured to obtain the distance from a first phase and a first refractive index detected when the wavelength of light from the light source is a first wavelength, a second phase and a second refractive index detected when the wavelength of light from the light source is a second wavelength, and a third phase at a synthetic wavelength of the first wavelength and the second wavelength. | 08-29-2013 |
20130314692 | ETCHING MONITOR DEVICE - An etching monitor device capable of high precision measurement in the presence of a mask region capable of producing interference. An interference optical system which acquires reflected interference light containing three interference component signals; a spectrometric measurement unit; an optical path difference analysis unit which computes optical path difference analysis data for the reflected interference spectrum; an uncorrected B-C interference distance computation unit; a correction table unit which computes and stores the relationship between mask thickness and amount of offset of optical path difference due to fusion of two interferences; a mask thickness measurement unit; a B-C interference distance true value computation unit; and an etching depth computation unit which computes the etching depth based on a corrected B-C interference distance and mask thickness. | 11-28-2013 |
20150138530 | MEASURING APPARATUS COMPRISING AN INTERFEROMETER AND AN ABSORPTION MEDIUM DEFINING A DENSE LINE SPECTRUM - Measuring apparatus comprising a tunable laser diode for generating a mono mode measurement radiation, said laser diode being designed as a laser beam source in such a way that an emission wavelength of the measurement radiation is variable within a wavelength range by means of the variation of a tuning parameter, comprising an absorption medium defining absorption lines within the wavelength range, comprising a memory having a line atlas for the absorption medium, comprising a detector for determining an absorptivity and comprising a control and evaluation unit for regulating the emission wavelength by means of the at least one tuning parameter in a manner dependent on the absorptivity determined in such a way that the emission wavelength remains stable. | 05-21-2015 |
20150308811 | Method for generating M demodulation signals - A method for generating M demodulation signals is disclosed. In one aspect, the method includes: providing M input signals, injecting each input signal into at least one first interferometer, and detecting M demodulation signals. The method also includes choosing M positive integers that are not all equal to zero and computing M demodulation signals. The i | 10-29-2015 |
20160139253 | Signal acquisition and distance variation measurement system for laser ranging interferometers - A signal acquisition and distance variation measurement system for laser ranging interferometers comprising a signal acquisition unit. This unit comprises a frequency detection subsystem to detect the frequency of a received laser beam measurement signal which is buried in noise, wherein the subsystem comprises an acquisition subsystem with a wavelet packet decomposition unit and a phase/frequency detector PLL; a main PLL unit being coupled to the frequency detection subsystem for receiving the detected frequency of the measurement signal for phase estimation of the measurement signal; and a phasemeter band detection subsystem for detecting whether the measurement signal frequency is higher or lower than a reference signal frequency of a reference laser beam by operating a known change to the frequency of the reference signal and measuring the consequent change in the frequency of an interference signal for having the phase of reference signal locked to the measurement signal phase. | 05-19-2016 |
356400100 | Having different frequency sources | 7 |
20080304039 | SENSOR ARRAY AND SENSOR DEVICE FOR A SENSOR ARRAY - The invention proposes a sensor array having a plurality of sensor devices comprising a source of electromagnetic radiation, a receiver for the electromagnetic radiation and a control device, the control device being designed to use the source to emit electromagnetic radiation and being designed to determine a distance covered by electromagnetic radiation, which is emitted by the source, from a reflection surface of an object to the receiver by evaluating the reflected radiation. According to the invention, the sensor devices of the plurality of sensor devices operate at different frequencies or using time-division multiplexing. The invention also proposes a sensor device for a sensor array, the control device being designed to measure the distance at different frequencies or using time-division multiplexing. | 12-11-2008 |
20080304042 | Distance/speed meter and distance/speed measuring method - In a distance/speed meter, first and second semiconductor lasers emit parallel laser light beams to a measurement target. A first laser driver drives the first semiconductor laser such that the oscillation interval in which at least the oscillation wavelength monotonically increases repeatedly exists. A second laser driver drives the second semiconductor laser such that the oscillation wavelength increases/decreases inversely to the oscillation wavelength of the first semiconductor laser. First and second light-receiving devices convert optical outputs from the first and second semiconductor lasers into electrical signals. A counting unit counts the numbers of interference waveforms generated by the first and second laser light beams and return light beams of the first and second laser light beams. A computing device computes the distance to the measurement target and the speed of the measurement target from the minimum and maximum oscillation wavelengths of the first and second semiconductor lasers and the count result obtained by the counting unit. | 12-11-2008 |
20100026983 | LIGHTWAVE INTERFEROMETRIC DISTANCE MEASURING METHOD AND APPARATUS - When the geometric distance L from the body of an interferometer to a target 110 is accurately measured from distance measurement values D | 02-04-2010 |
20140139818 | Chirped Coherent Laser Radar System and Method - A laser radar system using collocated laser beams to unambiguously detects a range of a target and a range rate at which the target is moving relative to the laser radar system. Another aspect of various embodiments of the invention may relate to a laser radar system that uses multiple laser radar sections to obtain multiple simultaneous measurements (or substantially so), whereby both range and range rate can be determined without various temporal effects introduced by systems employing single laser sections taking sequential measurements. In addition, other aspects of various embodiments of the invention may enable faster determination of the range and rate of the target, a more accurate determination of the range and rate of the target, and/or may provide other advantages. | 05-22-2014 |
20150131078 | SYNTHETIC WAVE LASER RANGING SENSORS AND METHODS - Systems and methods for measuring a distance to an object. An exemplary method includes directing light beams from three or more continuous-wave lasers onto a target to generate an interference beam, and also frequency shifting the light beams split off from the lasers to generate local oscillator beams. When the interference beam and the local oscillator beams are combined, the method further includes determining optical phases of heterodynes produced by combining the light beams and the local oscillator beams, and determining synthetic phases by taking the difference between the optical phases of the heterodynes. The method further includes determining synthetic wavelengths based on the differences between the frequencies of the lasers. The method further includes determining a distance to the target based on the synthetic phases and the synthetic wavelengths. | 05-14-2015 |
20150331109 | SYSTEM AND METHOD FOR HIGH-PRECISION OPTICAL MEASUREMENT OF DISTANCES - A method determines a distance with a specified accuracy. The method transmits to an interferometer a test signal oscillating with a test frequency and receives, in response to the transmitting, an interferometric signal formed by interfering the test signal with a delayed signal produced by delaying a copy of the test signal over the distance equal to a path length difference in the interferometer. The test frequency is varying such that the test signal oscillates with different values of the test frequency. The method determines at least two values of the test frequency corresponding to particular values of the interferometric signal by beating the test signal with a reference signal having a reference frequency, wherein a value of the reference frequency is an absolute value predetermined with the specified accuracy. The method determines the distance using the two values of the test frequency. | 11-19-2015 |
20190145766 | ARTICULATED HEAD WITH MULTIPLE SENSORS FOR MEASURING MACHINE | 05-16-2019 |